{"id":22330,"date":"2021-12-17T16:44:10","date_gmt":"2021-12-17T09:44:10","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=22330"},"modified":"2021-12-17T16:44:12","modified_gmt":"2021-12-17T09:44:12","slug":"ung-dung-don-dieu-trong-giai-phuong-trinh-he-phuong-trinh-bat-phuong-trinh-va-he-bat-phuong-trinh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/ung-dung-don-dieu-trong-giai-phuong-trinh-he-phuong-trinh-bat-phuong-trinh-va-he-bat-phuong-trinh\/","title":{"rendered":"\u1ee8ng d\u1ee5ng \u0111\u01a1n \u0111i\u1ec7u trong gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh, h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh, b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 h\u1ec7 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh"},"content":{"rendered":"<p><a id=\"post-22330-_Toc492701526\"><\/a><a id=\"post-22330-_Toc493273876\"><\/a><em>Trong khu\u00f4n kh\u1ed5 ch\u01b0\u01a1ng tr\u00ecnh, t\u00e1c gi\u1ea3 ch\u1ec9 \u0111\u1ec1 c\u1eadp nh\u1eefng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p. B\u1ea1n \u0111\u1ecdc mu\u1ed1n nghi\u00ean c\u1ee9u k\u0129 v\u1ec1 \u1ee9ng d\u1ee5ng \u0111\u01a1n \u0111i\u1ec7u trong vi\u1ec7c gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh\u2026, vui l\u00f2ng t\u00ecm \u0111\u1ecdc t\u1eadp s\u00e1ch: \u0110\u1ea1i s\u1ed1 &#8211; l\u01b0\u1ee3ng gi\u00e1c. <\/em><\/p>\n<p><strong>Ph\u01b0\u01a1ng ph\u00e1p .<\/strong><\/p>\n<p>Bi\u1ebfn \u0111\u1ed5i ph\u01b0\u01a1ng tr\u00ecnh ,b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho th\u00e0nh d\u1ea1ng f(x) = g(m) ,<\/p>\n<p>f(x) &gt; g(m),\u2026Sau \u0111\u00f3 l\u1eadp b\u1ea3ng bi\u1ebfn thi\u00ean c\u1ee7a f(x) , d\u1ef1a v\u00e0o b\u1ea3ng bi\u1ebfn thi\u00ean n\u00e0y s\u1ebd t\u00ecm \u0111\u01b0\u1ee3c c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a tham s\u1ed1 th\u1ecfa y\u00eau c\u1ea7u c\u1ee7a b\u00e0i to\u00e1n.<\/p>\n<p><strong><em>D\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a h\u00e0m s\u1ed1 \u0111\u1ed3ng bi\u1ebfn, h\u00e0m s\u1ed1 ngh\u1ecbch bi\u1ebfn ta th\u1ea5y<\/em><\/strong><\/p>\n<p><img decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22331\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-30.png\" alt=\"IMG_256\" \/> N\u1ebfu h\u00e0m s\u1ed1 <img decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22332\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-29.png\" alt=\"IMG_257\" \/> li\u00ean t\u1ee5c v\u00e0 \u0111\u1ed3ng bi\u1ebfn tr\u00ean D th\u00ec :<\/p>\n<p><img decoding=\"async\" width=\"145\" height=\"25\" class=\"wp-image-22333\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-30.png\" alt=\"IMG_258\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"145\" height=\"25\" class=\"wp-image-22334\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-28.png\" alt=\"IMG_259\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22335\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-30.png\" alt=\"IMG_260\" \/> N\u1ebfu h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22336\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-27.png\" alt=\"IMG_261\" \/> li\u00ean t\u1ee5c v\u00e0 ngh\u1ecbch bi\u1ebfn tr\u00ean D th\u00ec :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"145\" height=\"25\" class=\"wp-image-22337\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-28.png\" alt=\"IMG_262\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"25\" class=\"wp-image-22338\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-29.png\" alt=\"IMG_263\" \/> .<\/p>\n<p>T\u1eeb \u0111\u00f3 g\u1ee3i cho ch\u00fang ta \u1ee9ng d\u1ee5ng v\u00e0o c\u00e1c b\u00e0i to\u00e1n ch\u1ee9ng minh b\u1ea5t \u0111\u1eb3ng th\u1ee9c v\u00e0 c\u00e1c b\u00e0i to\u00e1n gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh, b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh. C\u1ee5 th\u1ec3 ta c\u00f3 c\u00e1c t\u00ednh ch\u1ea5t sau:<\/p>\n<p><strong>T\u00ednh ch\u1ea5t 1<em>: <\/em><\/strong>N\u1ebfu h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22339\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-28.png\" alt=\"IMG_264\" \/> li\u00ean t\u1ee5c v\u00e0 lu\u00f4n \u0111\u1ed3ng bi\u1ebfn (ho\u1eb7c lu\u00f4n ngh\u1ecbch bi\u1ebfn) tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22340\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-28.png\" alt=\"IMG_265\" \/> th\u00ec s\u1ed1 nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh : <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"32\" class=\"wp-image-22341\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-28.png\" alt=\"IMG_266\" \/> (tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22342\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-29.png\" alt=\"IMG_267\" \/> ) kh\u00f4ng nhi\u1ec1u h\u01a1n m\u1ed9t v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"155\" height=\"32\" class=\"wp-image-22343\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-29.png\" alt=\"IMG_268\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_268-29.png 155w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_268-29-150x32.png 150w\" sizes=\"(max-width: 155px) 100vw, 155px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"100\" height=\"25\" class=\"wp-image-22344\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-29.png\" alt=\"IMG_269\" \/> .<\/p>\n<p><strong>Ch\u1ee9ng minh:<\/strong> Ta gi\u1ea3 s\u1eed <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-22345\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-27.png\" alt=\"IMG_270\" \/> l\u00e0 h\u00e0m \u0111\u1ed3ng bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22346\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-29.png\" alt=\"IMG_271\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22347\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-29.png\" alt=\"IMG_272\" \/> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"145\" height=\"25\" class=\"wp-image-22348\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-27.png\" alt=\"IMG_273\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22349\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-28.png\" alt=\"IMG_274\" \/> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"145\" height=\"25\" class=\"wp-image-22350\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-27.png\" alt=\"IMG_275\" \/><\/p>\n<p><strong>T\u00ednh ch\u1ea5t 2:<\/strong> N\u1ebfu h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22351\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-28.png\" alt=\"IMG_276\" \/> li\u00ean t\u1ee5c v\u00e0 lu\u00f4n \u0111\u1ed3ng bi\u1ebfn (ho\u1eb7c lu\u00f4n ngh\u1ecbch bi\u1ebfn) ; h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-22352\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-28.png\" alt=\"IMG_277\" \/> li\u00ean t\u1ee5c v\u00e0 lu\u00f4n ngh\u1ecbch bi\u1ebfn (ho\u1eb7c lu\u00f4n \u0111\u1ed3ng bi\u1ebfn) tr\u00ean D th\u00ec s\u1ed1 nghi\u1ec7m tr\u00ean D c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh : <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"32\" class=\"wp-image-22353\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-29.png\" alt=\"IMG_278\" \/> kh\u00f4ng nhi\u1ec1u h\u01a1n m\u1ed9t.<\/p>\n<p><strong>Ch\u1ee9ng minh:<\/strong> Gi\u1ea3 s\u1eed <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-22354\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-27.png\" alt=\"IMG_279\" \/> \u0111\u1ed3ng bi\u1ebfn c\u00f2n <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"20\" class=\"wp-image-22355\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-29.png\" alt=\"IMG_280\" \/> ngh\u1ecbch bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22356\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-28.png\" alt=\"IMG_281\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"170\" height=\"29\" class=\"wp-image-22357\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-29.png\" alt=\"IMG_282\" \/> .<\/p>\n<p>* N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"390\" height=\"29\" class=\"wp-image-22358\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-28.png\" alt=\"IMG_283\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_283-28.png 390w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_283-28-300x22.png 300w\" sizes=\"(max-width: 390px) 100vw, 390px\" \/> v\u00f4 nghi\u1ec7m<\/p>\n<p>* N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"390\" height=\"29\" class=\"wp-image-22359\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-28.png\" alt=\"IMG_284\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_284-28.png 390w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_284-28-300x22.png 300w\" sizes=\"(max-width: 390px) 100vw, 390px\" \/> v\u00f4 nghi\u1ec7m<\/p>\n<p>V\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"29\" class=\"wp-image-22360\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-29.png\" alt=\"IMG_285\" \/> l\u00e0 nghi\u1ec7m duy nh\u1ea5t c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"25\" class=\"wp-image-22361\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-28.png\" alt=\"IMG_286\" \/> .<\/p>\n<p><strong>T\u00ednh ch\u1ea5t 3: <\/strong>N\u1ebfu h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"32\" class=\"wp-image-22362\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-29.png\" alt=\"IMG_287\" \/> li\u00ean t\u1ee5c v\u00e0 lu\u00f4n \u0111\u1ed3ng bi\u1ebfn ( ho\u1eb7c lu\u00f4n ngh\u1ecbch bi\u1ebfn) tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22363\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-29.png\" alt=\"IMG_288\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"294\" height=\"25\" class=\"wp-image-22364\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-30.png\" alt=\"IMG_289\" \/> .<\/p>\n<p><strong>T\u00ednh ch\u1ea5t 4:<\/strong> Cho h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22365\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-29.png\" alt=\"IMG_290\" \/> li\u00ean t\u1ee5c tr\u00ean [a;b] v\u00e0 c\u00f3 \u0111\u1ea1o h\u00e0m tr\u00ean kho\u1ea3ng li\u00ean t\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-22366\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-29.png\" alt=\"IMG_291\" \/> . N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"25\" class=\"wp-image-22367\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-29.png\" alt=\"IMG_292\" \/> th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"25\" class=\"wp-image-22368\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-29.png\" alt=\"IMG_293\" \/> c\u00f3 \u00edt nh\u1ea5t m\u1ed9t nghi\u1ec7m thu\u1ed9c kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22369\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-28.png\" alt=\"IMG_294\" \/> .<\/p>\n<p><strong>Ch\u1ee9ng minh<\/strong>:<\/p>\n<p>Gi\u1ea3 s\u1eed ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"25\" class=\"wp-image-22370\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-27.png\" alt=\"IMG_295\" \/> v\u00f4 nghi\u1ec7m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22371\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-27.png\" alt=\"IMG_296\" \/> .<\/p>\n<p>Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"147\" height=\"25\" class=\"wp-image-22372\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-27.png\" alt=\"IMG_297\" \/> (ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"145\" height=\"25\" class=\"wp-image-22373\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-27.png\" alt=\"IMG_298\" \/> ).<\/p>\n<p>Suy ra <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"25\" class=\"wp-image-22374\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-28.png\" alt=\"IMG_299\" \/> (ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"25\" class=\"wp-image-22375\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-28.png\" alt=\"IMG_300\" \/> ).<\/p>\n<p>\u0110i\u1ec1u n\u00e0y tr\u00e1i v\u1edbi gi\u1ea3 thi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"25\" class=\"wp-image-22376\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-28.png\" alt=\"IMG_301\" \/> .<\/p>\n<p>V\u1eady ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"25\" class=\"wp-image-22377\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-28.png\" alt=\"IMG_302\" \/> c\u00f3 \u00edt nh\u1ea5t m\u1ed9t nghi\u1ec7m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22378\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-28.png\" alt=\"IMG_303\" \/> .<\/p>\n<p>T\u1eeb \u0111\u1ecbnh l\u00ed n\u00e0y, ta c\u00f3 \u0111\u01b0\u1ee3c hai h\u1ec7 qu\u1ea3 sau:<\/p>\n<p><strong><em>H\u1ec7 qu\u1ea3 1:<\/em><\/strong> N\u1ebfu ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-22379\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-28.png\" alt=\"IMG_304\" \/> c\u00f3 m nghi\u1ec7m th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"25\" class=\"wp-image-22380\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-28.png\" alt=\"IMG_305\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"20\" class=\"wp-image-22381\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-28.png\" alt=\"IMG_306\" \/> nghi\u1ec7m.<\/p>\n<p><strong><em>H\u1ec7 qu\u1ea3 2:<\/em><\/strong> Cho h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"32\" class=\"wp-image-22382\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-28.png\" alt=\"IMG_307\" \/> c\u00f3 \u0111\u1ea1o h\u00e0m \u0111\u1ebfn c\u1ea5p k li\u00ean t\u1ee5c tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"25\" class=\"wp-image-22383\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-28.png\" alt=\"IMG_308\" \/> . N\u1ebfu ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"32\" class=\"wp-image-22384\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-27.png\" alt=\"IMG_309\" \/> c\u00f3 \u0111\u00fang m nghi\u1ec7m th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"32\" class=\"wp-image-22385\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-28.png\" alt=\"IMG_310\" \/> c\u00f3 nhi\u1ec1u nh\u1ea5t l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"20\" class=\"wp-image-22386\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-27.png\" alt=\"IMG_311\" \/> nghi\u1ec7m.<\/p>\n<p>Th\u1eadt v\u1eady: Gi\u1ea3 s\u1eed ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"32\" class=\"wp-image-22387\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-27.png\" alt=\"IMG_312\" \/> c\u00f3 nhi\u1ec1u h\u01a1n m+1 nghi\u1ec7m th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"32\" class=\"wp-image-22388\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-26.png\" alt=\"IMG_313\" \/> c\u00f3 nhi\u1ec1u h\u01a1n m nghi\u1ec7m, \u0111i\u1ec1u n\u00e0y tr\u00e1i v\u1edbi gi\u1ea3 thi\u1ebft b\u00e0i to\u00e1n.<\/p>\n<p>T\u1eeb h\u1ec7 qu\u1ea3 2 <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"19\" class=\"wp-image-22389\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-26.png\" alt=\"IMG_314\" \/> n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"25\" class=\"wp-image-22390\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-26.png\" alt=\"IMG_315\" \/> c\u00f3 m\u1ed9t nghi\u1ec7m th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"25\" class=\"wp-image-22391\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-26.png\" alt=\"IMG_316\" \/> c\u00f3 nhi\u1ec1u nh\u1ea5t hai nghi\u1ec7m.<\/p>\n<p><strong><em>Ch\u00fa \u00fd:<\/em><\/strong><em> S\u1eed d\u1ee5ng t\u00ednh \u0111\u01a1n \u0111i\u1ec7u \u0111\u1ec3 gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh \u2013 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh ta th\u01b0\u1eddng \u0111i theo hai h\u01b0\u1edbng sau:<\/em><\/p>\n<p><strong>H\u01b0\u1edbng 1:<\/strong> \u0110\u01b0a ph\u01b0\u01a1ng tr\u00ecnh v\u1ec1 d\u1ea1ng <img loading=\"lazy\" decoding=\"async\" width=\"89\" height=\"29\" class=\"wp-image-22392\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-26.png\" alt=\"IMG_317\" \/> , trong \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"25\" class=\"wp-image-22393\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-26.png\" alt=\"IMG_318\" \/> l\u00e0 m\u1ed9t h\u00e0m s\u1ed1 li\u00ean t\u1ee5c v\u00e0 lu\u00f4n \u0111\u1ed3ng bi\u1ebfn ho\u1eb7c lu\u00f4n ngh\u1ecbch bi\u1ebfn tr\u00ean t\u1eadp \u0111ang x\u00e9t.<\/p>\n<p>\u0110\u1ec3 l\u00e0m theo h\u01b0\u1edbng n\u00e0y, ch\u00fang ta c\u1ea7n nh\u1ea9m tr\u01b0\u1edbc m\u1ed9t nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c t\u00ednh \u0111\u01a1n \u0111i\u1ec7u c\u1ee7a h\u00e0m s\u1ed1 f.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22394\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-26.png\" alt=\"IMG_319\" \/> \u0110\u1ec3 nh\u1ea9m nghi\u1ec7m, ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u00e1y t\u00ednh b\u1ecf t\u00fai \u0111\u1ec3 t\u00ecm nghi\u1ec7m.<\/p>\n<p>C\u1ee5 th\u1ec3: \u0110\u1ec3 t\u00ecm m\u1ed9t nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"25\" class=\"wp-image-22395\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-26.png\" alt=\"IMG_320\" \/> ta th\u1ef1c hi\u1ec7n nh\u01b0 sau<\/p>\n<p><strong>B\u01b0\u1edbc 1:<\/strong> Nh\u1eadp bi\u1ec3u th\u1ee9c <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"25\" class=\"wp-image-22396\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-25.png\" alt=\"IMG_321\" \/> (D\u00f9ng ph\u00edm ALPHA+ X)<\/p>\n<p><strong>B\u01b0\u1edbc 2:<\/strong> D\u00f9ng l\u1ec7nh gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: SHIFT+CALC (SOLVE) nh\u1eadp gi\u00e1 tr\u1ecb c\u1ee7a X (nh\u1eadp gi\u00e1 tr\u1ecb b\u1ea5t k\u00ec) =.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22397\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-25.png\" alt=\"IMG_322\" \/> \u0110\u1ec3 nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c t\u00ednh \u0111\u01a1n \u0111i\u1ec7u c\u1ee7a h\u00e0m s\u1ed1 f, ch\u00fang ta c\u1ea7n ch\u00fa \u00fd<\/p>\n<p>*T\u1ed5ng hai h\u00e0m s\u1ed1 \u0111\u1ed3ng bi\u1ebfn l\u00e0 m\u1ed9t h\u00e0m s\u1ed1 \u0111\u1ed3ng bi\u1ebfn<\/p>\n<p>* H\u00e0m s\u1ed1 \u0111\u1ed1i c\u1ee7a m\u1ed9t h\u00e0m s\u1ed1 \u0111\u1ed3ng bi\u1ebfn l\u00e0 m\u1ed9t h\u00e0m s\u1ed1 ngh\u1ecbch bi\u1ebfn.<\/p>\n<p>* N\u1ebfu h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22398\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-23.png\" alt=\"IMG_323\" \/> \u0111\u1ed3ng bi\u1ebfn th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"75\" height=\"34\" class=\"wp-image-22399\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-23.png\" alt=\"IMG_324\" \/> l\u00e0 h\u00e0m s\u1ed1 \u0111\u1ed3ng bi\u1ebfn.<\/p>\n<p>* N\u1ebfu h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-22400\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-23.png\" alt=\"IMG_325\" \/> \u0111\u1ed3ng bi\u1ebfn v\u00e0 nh\u1eadn gi\u00e1 tr\u1ecb d\u01b0\u01a1ng th\u00ec h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"52\" class=\"wp-image-22401\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-23.png\" alt=\"IMG_326\" \/> l\u00e0 m\u1ed9t h\u00e0m ngh\u1ecbch bi\u1ebfn.<\/p>\n<p><strong>H\u01b0\u1edbng 2:<\/strong> Bi\u1ebfn \u0111\u1ed5i ph\u01b0\u01a1ng tr\u00ecnh v\u1ec1 d\u1ea1ng: <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"25\" class=\"wp-image-22402\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-23.png\" alt=\"IMG_327\" \/> , trong \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"19\" class=\"wp-image-22403\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-22.png\" alt=\"IMG_328\" \/> l\u00e0 c\u00e1c h\u00e0m theo x.<\/p>\n<p>L\u00e0m theo h\u01b0\u1edbng ta th\u01b0\u1eddng \u00e1p d\u1ee5ng khi g\u1eb7p ph\u01b0\u01a1ng tr\u00ecnh ch\u1ee9a hai ph\u00e9p to\u00e1n ng\u01b0\u1ee3c nhau.<\/p>\n<p><strong>Ch\u00fa \u00fd 1<\/strong>:<\/p>\n<p>K\u00fd hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22404\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-22.png\" alt=\"IMG_329\" \/> l\u00e0 <strong>m\u1ed9t<\/strong> \u0111o\u1ea1n,<strong>m\u1ed9t<\/strong> kho\u1ea3ng ho\u1eb7c <strong>m\u1ed9t<\/strong> n\u1eeda kho\u1ea3ng.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22405\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-22.png\" alt=\"IMG_330\" \/> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"32\" class=\"wp-image-22406\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-22.png\" alt=\"IMG_331\" \/><strong>li\u00ean t\u1ee5c<\/strong> tr\u00ean \u0111o\u1ea1n <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"32\" class=\"wp-image-22407\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-22.png\" alt=\"IMG_332\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"100\" height=\"32\" class=\"wp-image-22408\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-22.png\" alt=\"IMG_333\" \/> th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-22409\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-21.png\" alt=\"IMG_334\" \/> c\u00f3<strong> \u00edt nh\u1ea5t<\/strong> m\u1ed9t nghi\u1ec7m <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"32\" class=\"wp-image-22410\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-21.png\" alt=\"IMG_335\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22411\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-21.png\" alt=\"IMG_336\" \/> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"32\" class=\"wp-image-22412\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-21.png\" alt=\"IMG_337\" \/><strong>li\u00ean t\u1ee5c<\/strong> v\u00e0 <strong>\u0111\u01a1n \u0111i\u1ec7u<\/strong> tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22413\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-21.png\" alt=\"IMG_338\" \/> th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-22414\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-21.png\" alt=\"IMG_339\" \/> c\u00f3 <strong>kh\u00f4ng qu\u00e1 m\u1ed9t nghi\u1ec7m<\/strong> tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22415\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-21.png\" alt=\"IMG_340\" \/> .<\/p>\n<p><strong>Ch\u00fa \u00fd 2<\/strong>:<\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"32\" class=\"wp-image-22416\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-21.png\" alt=\"IMG_341\" \/> li\u00ean t\u1ee5c v\u00e0 t\u0103ng tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22417\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-21.png\" alt=\"IMG_342\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"32\" class=\"wp-image-22418\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-21.png\" alt=\"IMG_343\" \/> li\u00ean t\u1ee5c v\u00e0 gi\u1ea3m (ho\u1eb7c l\u00e0 h\u00e0m h\u1eb1ng) tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22419\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-21.png\" alt=\"IMG_344\" \/> th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"32\" class=\"wp-image-22420\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-21.png\" alt=\"IMG_345\" \/> c\u00f3 kh\u00f4ng qu\u00e1 m\u1ed9t nghi\u1ec7m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22421\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-20.png\" alt=\"IMG_346\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22422\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-19.png\" alt=\"IMG_347\" \/> N\u1ebfu ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-22423\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-18.png\" alt=\"IMG_348\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"15\" class=\"wp-image-22424\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-18.png\" alt=\"IMG_349\" \/> nghi\u1ec7m tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-22425\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-18.png\" alt=\"IMG_350\" \/> th\u00ec ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-22426\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-18.png\" alt=\"IMG_351\" \/> c\u00f3 kh\u00f4ng qu\u00e1 <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"20\" class=\"wp-image-22427\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-18.png\" alt=\"IMG_352\" \/> nghi\u1ec7m tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-22428\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-18.png\" alt=\"IMG_353\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22429\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-18.png\" alt=\"IMG_354\" \/> T\u1ed5ng c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"20\" class=\"wp-image-22430\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-18.png\" alt=\"IMG_355\" \/> h\u00e0m t\u0103ng tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22431\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-18.png\" alt=\"IMG_356\" \/> l\u00e0 m\u1ed9t h\u00e0m t\u0103ng tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22432\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-18.png\" alt=\"IMG_357\" \/> , t\u1ed5ng c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"20\" class=\"wp-image-22433\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-18.png\" alt=\"IMG_358\" \/> h\u00e0m gi\u1ea3m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22434\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-18.png\" alt=\"IMG_359\" \/> l\u00e0 m\u1ed9t h\u00e0m gi\u1ea3m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22435\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-18.png\" alt=\"IMG_360\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-22436\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-17.png\" alt=\"IMG_361\" \/> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"32\" class=\"wp-image-22437\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-17.png\" alt=\"IMG_362\" \/> l\u00e0 h\u00e0m t\u0103ng tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22438\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-15.png\" alt=\"IMG_363\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"32\" class=\"wp-image-22439\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-17.png\" alt=\"IMG_364\" \/> t\u0103ng tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22440\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-17.png\" alt=\"IMG_365\" \/> n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22441\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-17.png\" alt=\"IMG_366\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"32\" class=\"wp-image-22442\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-17.png\" alt=\"IMG_367\" \/> gi\u1ea3m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-22443\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_368-17.png\" alt=\"IMG_368\" \/> n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22444\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_369-17.png\" alt=\"IMG_369\" \/> .<\/p>\n<p><strong>C\u00e1c v\u00ed d\u1ee5<\/strong><\/p>\n<p><strong>V\u00ed d\u1ee5 1. <\/strong>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh:<\/p>\n<p><strong>1. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"35\" class=\"wp-image-22445\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_370-17.png\" alt=\"IMG_370\" \/> <strong><em>\u0110\u1ec1 thi Cao \u0111\u1eb3ng n\u0103m 2012<\/em><\/strong><\/p>\n<p><strong>2. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"257\" height=\"32\" class=\"wp-image-22446\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_371-17.png\" alt=\"IMG_371\" \/><\/p>\n<p><strong>3. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"265\" height=\"29\" class=\"wp-image-22447\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_372-17.png\" alt=\"IMG_372\" \/> <strong><em>\u0110\u1ec1 thi \u0110\u1ea1i h\u1ecdc kh\u1ed1i B n\u0103m 2010<\/em><\/strong><\/p>\n<p><strong>4. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"320\" height=\"29\" class=\"wp-image-22448\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_373-16.png\" alt=\"IMG_373\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_373-16.png 320w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_373-16-300x27.png 300w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i.<\/strong><\/p>\n<p><strong>1. <\/strong>\u0110i\u1ec1u ki\u1ec7n: <img loading=\"lazy\" decoding=\"async\" width=\"57\" height=\"49\" class=\"wp-image-22449\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_374-16.png\" alt=\"IMG_374\" \/> .<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi: <img loading=\"lazy\" decoding=\"async\" width=\"250\" height=\"45\" class=\"wp-image-22450\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_375-16.png\" alt=\"IMG_375\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"32\" class=\"wp-image-22451\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_376-15.png\" alt=\"IMG_376\" \/><\/p>\n<p>X\u00e9t h\u00e0m s\u1ed1: <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"35\" class=\"wp-image-22452\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_377-14.png\" alt=\"IMG_377\" \/> tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"20\" class=\"wp-image-22453\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_378-13.png\" alt=\"IMG_378\" \/> .<\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"197\" height=\"35\" class=\"wp-image-22454\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_379-13.png\" alt=\"IMG_379\" \/> , suy ra <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"32\" class=\"wp-image-22455\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_380-13.png\" alt=\"IMG_380\" \/> \u0111\u1ed3ng bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"20\" class=\"wp-image-22456\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_381-13.png\" alt=\"IMG_381\" \/><\/p>\n<p>Do \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"32\" class=\"wp-image-22457\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_382-13.png\" alt=\"IMG_382\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"345\" height=\"62\" class=\"wp-image-22458\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_383-13.png\" alt=\"IMG_383\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_383-13.png 345w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_383-13-300x54.png 300w\" sizes=\"(max-width: 345px) 100vw, 345px\" \/><\/p>\n<p><strong>2. <\/strong>Nh\u1eadn x\u00e9t \u0111\u1eb7c \u0111i\u1ec3m c\u00e1c bi\u1ec3u th\u1ee9c d\u01b0\u1edbi d\u1ea5u c\u0103n ta th\u1ea5y \u1edf m\u1ed7i v\u1ebf bi\u1ec3u th\u1ee9c d\u01b0\u1edbi d\u1ea5u c\u0103n h\u01a1n k\u00e9m nhau 1. Do \u0111\u00f3 n\u1ebfu ta \u0111\u1eb7t \u0111\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"85\" height=\"30\" class=\"wp-image-22459\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_384-13.png\" alt=\"IMG_384\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"75\" height=\"32\" class=\"wp-image-22460\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_385-13.png\" alt=\"IMG_385\" \/> th\u00ec ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho tr\u1edf th\u00e0nh: <img loading=\"lazy\" decoding=\"async\" width=\"294\" height=\"35\" class=\"wp-image-22461\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_386-13.png\" alt=\"IMG_386\" \/> .<\/p>\n<p>Trong \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"124\" height=\"35\" class=\"wp-image-22462\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_387-11.png\" alt=\"IMG_387\" \/> , c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"180\" height=\"65\" class=\"wp-image-22463\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_388-9.png\" alt=\"IMG_388\" \/> n\u00ean f(t) l\u00e0 h\u00e0m \u0111\u1ed3ng bi\u1ebfn.<\/p>\n<p>Do \u0111\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"370\" height=\"49\" class=\"wp-image-22464\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_389-7.png\" alt=\"IMG_389\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_389-7.png 370w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_389-7-300x40.png 300w\" sizes=\"(max-width: 370px) 100vw, 370px\" \/><\/p>\n<p>V\u1eady ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 hai nghi\u1ec7m: <img loading=\"lazy\" decoding=\"async\" width=\"99\" height=\"49\" class=\"wp-image-22465\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_390-8.png\" alt=\"IMG_390\" \/> .<\/p>\n<p><strong>3<\/strong>. \u0110i\u1ec1u ki\u1ec7n: <img loading=\"lazy\" decoding=\"async\" width=\"277\" height=\"79\" class=\"wp-image-22466\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_391-7.png\" alt=\"IMG_391\" \/><\/p>\n<p>D\u1ec5 th\u1ea5y <img loading=\"lazy\" decoding=\"async\" width=\"57\" height=\"49\" class=\"wp-image-22467\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_392-8.png\" alt=\"IMG_392\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22468\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_393-8.png\" alt=\"IMG_393\" \/> kh\u00f4ng l\u00e0 nghi\u1ec7m ph\u01b0\u01a1ng tr\u00ecnh.<\/p>\n<p><strong><em>C\u00e1ch 1: <\/em><\/strong>X\u00e9t h\u00e0m s\u1ed1: <img loading=\"lazy\" decoding=\"async\" width=\"287\" height=\"35\" class=\"wp-image-22469\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_394-8.png\" alt=\"IMG_394\" \/> li\u00ean t\u1ee5c tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"55\" class=\"wp-image-22470\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_395-8.png\" alt=\"IMG_395\" \/> .<\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"57\" class=\"wp-image-22471\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_396-8.png\" alt=\"IMG_396\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_396-8.png 380w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_396-8-300x45.png 300w\" sizes=\"(max-width: 380px) 100vw, 380px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"355\" height=\"57\" class=\"wp-image-22472\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_397-8.png\" alt=\"IMG_397\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_397-8.png 355w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_397-8-300x48.png 300w\" sizes=\"(max-width: 355px) 100vw, 355px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"324\" height=\"55\" class=\"wp-image-22473\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_398-9.png\" alt=\"IMG_398\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_398-9.png 324w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_398-9-300x51.png 300w\" sizes=\"(max-width: 324px) 100vw, 324px\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"229\" height=\"55\" class=\"wp-image-22474\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_399-9.png\" alt=\"IMG_399\" \/> \u0111\u1ed3ng bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"55\" class=\"wp-image-22475\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_400-9.png\" alt=\"IMG_400\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-22476\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_401-9.png\" alt=\"IMG_401\" \/> .<\/p>\n<p>Do \u0111\u00f3 tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"55\" class=\"wp-image-22477\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_402-9.png\" alt=\"IMG_402\" \/> ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-22478\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_403-9.png\" alt=\"IMG_403\" \/> c\u00f3 \u0111\u00fang 1 nghi\u1ec7m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22479\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_404-9.png\" alt=\"IMG_404\" \/> .<\/p>\n<p>V\u1eady ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 nghi\u1ec7m duy nh\u1ea5t <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22480\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_405-9.png\" alt=\"IMG_405\" \/> .<\/p>\n<p><strong><em>C\u00e1ch 2: <\/em><\/strong>Ph\u01b0\u01a1ng tr\u00ecnh : <img loading=\"lazy\" decoding=\"async\" width=\"265\" height=\"29\" class=\"wp-image-22481\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_406-9.png\" alt=\"IMG_406\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"364\" height=\"39\" class=\"wp-image-22482\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_407-9.png\" alt=\"IMG_407\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_407-9.png 364w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_407-9-300x32.png 300w\" sizes=\"(max-width: 364px) 100vw, 364px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"352\" height=\"57\" class=\"wp-image-22483\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_408-9.png\" alt=\"IMG_408\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_408-9.png 352w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_408-9-300x49.png 300w\" sizes=\"(max-width: 352px) 100vw, 352px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"385\" height=\"57\" class=\"wp-image-22484\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_409-9.png\" alt=\"IMG_409\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_409-9.png 385w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_409-9-300x44.png 300w\" sizes=\"(max-width: 385px) 100vw, 385px\" \/><\/p>\n<p>V\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"364\" height=\"55\" class=\"wp-image-22485\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_410-9.png\" alt=\"IMG_410\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_410-9.png 364w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_410-9-300x45.png 300w\" sizes=\"(max-width: 364px) 100vw, 364px\" \/> n\u00ean ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"177\" height=\"32\" class=\"wp-image-22486\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_411-9.png\" alt=\"IMG_411\" \/> .<\/p>\n<p>V\u1eady ph\u01b0\u01a1ng tr\u00ecnh cho c\u00f3 nghi\u1ec7m duy nh\u1ea5t <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22487\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_412-9.png\" alt=\"IMG_412\" \/> .<\/p>\n<p><strong>4<\/strong>. \u0110i\u1ec1u ki\u1ec7n: <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"49\" class=\"wp-image-22488\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_413-9.png\" alt=\"IMG_413\" \/> .<\/p>\n<p>D\u1ec5 th\u1ea5y, <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"20\" class=\"wp-image-22489\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_414-9.png\" alt=\"IMG_414\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"49\" class=\"wp-image-22490\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_415-9.png\" alt=\"IMG_415\" \/> kh\u00f4ng l\u00e0 nghi\u1ec7m ph\u01b0\u01a1ng tr\u00ecnh.<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh cho vi\u1ebft l\u1ea1i: <img loading=\"lazy\" decoding=\"async\" width=\"395\" height=\"42\" class=\"wp-image-22491\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_416-9.png\" alt=\"IMG_416\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_416-9.png 395w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_416-9-300x32.png 300w\" sizes=\"(max-width: 395px) 100vw, 395px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"399\" height=\"57\" class=\"wp-image-22492\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_417-9.png\" alt=\"IMG_417\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_417-9.png 399w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_417-9-300x43.png 300w\" sizes=\"(max-width: 399px) 100vw, 399px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"57\" class=\"wp-image-22493\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_418-9.png\" alt=\"IMG_418\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_418-9.png 400w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_418-9-300x43.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>X\u00e9t h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"35\" class=\"wp-image-22494\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_419-8.png\" alt=\"IMG_419\" \/> , v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"85\" height=\"55\" class=\"wp-image-22495\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_420-8.png\" alt=\"IMG_420\" \/> .<\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"32\" class=\"wp-image-22496\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_421-8.png\" alt=\"IMG_421\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"134\" height=\"49\" class=\"wp-image-22497\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_422-8.png\" alt=\"IMG_422\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"152\" height=\"72\" class=\"wp-image-22498\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_423-8.png\" alt=\"IMG_423\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_423-8.png 152w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_423-8-150x72.png 150w\" sizes=\"(max-width: 152px) 100vw, 152px\" \/> , do \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"312\" height=\"52\" class=\"wp-image-22499\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_424-8.png\" alt=\"IMG_424\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_424-8.png 312w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_424-8-300x50.png 300w\" sizes=\"(max-width: 312px) 100vw, 312px\" \/> , m\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"85\" height=\"55\" class=\"wp-image-22500\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_425-8.png\" alt=\"IMG_425\" \/><\/p>\n<p>V\u1eady, ph\u01b0\u01a1ng tr\u00ecnh cho c\u00f3 nghi\u1ec7m duy nh\u1ea5t <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-22501\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_426-8.png\" alt=\"IMG_426\" \/> .<\/p>\n<p><strong>V\u00ed d\u1ee5 2 : <\/strong>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh: <img loading=\"lazy\" decoding=\"async\" width=\"267\" height=\"40\" class=\"wp-image-22502\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_427-8.png\" alt=\"IMG_427\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i.<\/strong><\/p>\n<p>\u0110i\u1ec1u ki\u1ec7n x\u00e1c \u0111\u1ecbnh: <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"49\" class=\"wp-image-22503\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_428-8.png\" alt=\"IMG_428\" \/> .<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho t\u01b0\u01a1ng \u0111\u01b0\u01a1ng: <img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"49\" class=\"wp-image-22504\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_429-8.png\" alt=\"IMG_429\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-22505\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_430-7.png\" alt=\"IMG_430\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"227\" height=\"49\" class=\"wp-image-22506\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_431-6.png\" alt=\"IMG_431\" \/><\/p>\n<p>\u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" width=\"245\" height=\"49\" class=\"wp-image-22507\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_432-6.png\" alt=\"IMG_432\" \/> v\u1edbi x thu\u1ed9c <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"55\" class=\"wp-image-22508\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_433-6.png\" alt=\"IMG_433\" \/><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"329\" height=\"67\" class=\"wp-image-22509\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_434-6.png\" alt=\"IMG_434\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_434-6.png 329w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_434-6-300x61.png 300w\" sizes=\"(max-width: 329px) 100vw, 329px\" \/> v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"57\" height=\"49\" class=\"wp-image-22510\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_435-6.png\" alt=\"IMG_435\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"19\" class=\"wp-image-22511\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_436-6.png\" alt=\"IMG_436\" \/> h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"25\" class=\"wp-image-22512\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_437-6.png\" alt=\"IMG_437\" \/> \u0111\u1ed3ng bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"55\" class=\"wp-image-22513\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_438-6.png\" alt=\"IMG_438\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"19\" class=\"wp-image-22514\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_439-6.png\" alt=\"IMG_439\" \/> ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"25\" class=\"wp-image-22515\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_440-6.png\" alt=\"IMG_440\" \/> c\u00f3 t\u1ed1i \u0111a m\u1ed9t nghi\u1ec7m<\/p>\n<p>V\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"25\" class=\"wp-image-22516\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_441-6.png\" alt=\"IMG_441\" \/> (2). T\u1eeb (1) v\u00e0 (2) suy ra ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho c\u00f3 nghi\u1ec7m duy nh\u1ea5t <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-22517\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_442-6.png\" alt=\"IMG_442\" \/> .<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong khu\u00f4n kh\u1ed5 ch\u01b0\u01a1ng tr\u00ecnh, t\u00e1c gi\u1ea3 ch\u1ec9 \u0111\u1ec1 c\u1eadp nh\u1eefng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p. B\u1ea1n \u0111\u1ecdc mu\u1ed1n nghi\u00ean c\u1ee9u k\u0129 v\u1ec1 \u1ee9ng d\u1ee5ng \u0111\u01a1n \u0111i\u1ec7u trong vi\u1ec7c gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh\u2026, vui l\u00f2ng t\u00ecm \u0111\u1ecdc t\u1eadp s\u00e1ch: \u0110\u1ea1i s\u1ed1 &#8211; l\u01b0\u1ee3ng gi\u00e1c. Ph\u01b0\u01a1ng ph\u00e1p . Bi\u1ebfn \u0111\u1ed5i ph\u01b0\u01a1ng tr\u00ecnh ,b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho th\u00e0nh [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[43],"tags":[],"class_list":["post-22330","post","type-post","status-publish","format-standard","hentry","category-toan-lop-12"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/22330","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=22330"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/22330\/revisions"}],"predecessor-version":[{"id":22518,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/22330\/revisions\/22518"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=22330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=22330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=22330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}