{"id":21630,"date":"2021-12-17T16:28:42","date_gmt":"2021-12-17T09:28:42","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=21630"},"modified":"2021-12-17T16:28:43","modified_gmt":"2021-12-17T09:28:43","slug":"phuong-trinh-duong-thang","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/phuong-trinh-duong-thang\/","title":{"rendered":"PH\u01af\u01a0NG TR\u00ccNH \u0110\u01af\u1edcNG TH\u1eb2NG"},"content":{"rendered":"<p><strong>Vi\u0301 du\u0323 1:<\/strong> X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a <img decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-21631\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-24.png\" alt=\"IMG_256\" \/> \u0111\u01b0\u1eddng th\u1eb3ng sau \u0111\u00e2y:<\/p>\n<p><img decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21632\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-23.png\" alt=\"IMG_257\" \/> : <img decoding=\"async\" width=\"110\" height=\"27\" class=\"wp-image-21633\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-24.png\" alt=\"IMG_258\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"30\" class=\"wp-image-21634\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-22.png\" alt=\"IMG_259\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"27\" class=\"wp-image-21635\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-24.png\" alt=\"IMG_260\" \/> .<\/p>\n<p><strong>A. <\/strong>Song song. <strong>B. <\/strong>Tr\u00f9ng nhau. <strong>C. <\/strong>Vu\u00f4ng g\u00f3c nhau. <strong>D. <\/strong>C\u1eaft nhau.<\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>A<\/strong>.<\/p>\n<p>C\u00e1ch 1: Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u1ea5y v\u00f4 nghi\u1ec7m n\u00ean hai \u0111\u01b0\u1eddng th\u1eb3ng song song<\/p>\n<p>C\u00e1ch 2: \u0110\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21636\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-21.png\" alt=\"IMG_261\" \/> c\u00f3 vtpt <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"34\" class=\"wp-image-21637\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-22.png\" alt=\"IMG_262\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"30\" class=\"wp-image-21638\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-23.png\" alt=\"IMG_263\" \/> c\u00f3 vtpt <img loading=\"lazy\" decoding=\"async\" width=\"95\" height=\"34\" class=\"wp-image-21639\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-22.png\" alt=\"IMG_264\" \/> .<\/p>\n<p>Hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"30\" class=\"wp-image-21640\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-22.png\" alt=\"IMG_265\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21641\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-22.png\" alt=\"IMG_266\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"34\" class=\"wp-image-21642\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-23.png\" alt=\"IMG_267\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"23\" class=\"wp-image-21643\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-23.png\" alt=\"IMG_268\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_268-23.png 53w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_268-23-50x23.png 50w\" sizes=\"(max-width: 53px) 100vw, 53px\" \/> n\u00ean hai \u0111\u01b0\u1eddng th\u1eb3ng n\u00e0y song song<\/p>\n<p><strong>Vi\u0301 du\u0323 2: <\/strong>\u0110\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"147\" height=\"27\" class=\"wp-image-21644\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-23.png\" alt=\"IMG_269\" \/> c\u1eaft \u0111\u01b0\u1eddng th\u1eb3ng n\u00e0o sau \u0111\u00e2y?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"30\" class=\"wp-image-21645\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-21.png\" alt=\"IMG_270\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"30\" class=\"wp-image-21646\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-23.png\" alt=\"IMG_271\" \/><\/p>\n<p><strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"30\" class=\"wp-image-21647\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-23.png\" alt=\"IMG_272\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"165\" height=\"30\" class=\"wp-image-21648\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-21.png\" alt=\"IMG_273\" \/><\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>A<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"147\" height=\"27\" class=\"wp-image-21649\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274.jpeg\" alt=\"IMG_274\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"124\" height=\"30\" class=\"wp-image-21650\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275.jpeg\" alt=\"IMG_275\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"104\" height=\"52\" class=\"wp-image-21651\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276.jpeg\" alt=\"IMG_276\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"30\" class=\"wp-image-21652\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277.jpeg\" alt=\"IMG_277\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 3:<\/strong> Hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"324\" height=\"30\" class=\"wp-image-21653\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-23.png\" alt=\"IMG_278\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_278-23.png 324w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_278-23-300x28.png 300w\" sizes=\"(max-width: 324px) 100vw, 324px\" \/> c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m c\u00f3 to\u1ea1 \u0111\u1ed9:<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"34\" class=\"wp-image-21654\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-21.png\" alt=\"IMG_279\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"34\" class=\"wp-image-21655\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-23.png\" alt=\"IMG_280\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"34\" class=\"wp-image-21656\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-22.png\" alt=\"IMG_281\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21657\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-23.png\" alt=\"IMG_282\" \/> .<\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>A<\/strong>.<\/p>\n<p>Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh <img loading=\"lazy\" decoding=\"async\" width=\"140\" height=\"60\" class=\"wp-image-21658\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-22.png\" alt=\"IMG_283\" \/> ta \u0111\u01b0\u1ee3c <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"60\" class=\"wp-image-21659\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-22.png\" alt=\"IMG_284\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 4: <\/strong>Ph\u01b0\u01a1ng tr\u00ecnh n\u00e0o sau \u0111\u00e2y bi\u1ec3u di\u1ec5n \u0111\u01b0\u1eddng th\u1eb3ng kh\u00f4ng song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"117\" height=\"27\" class=\"wp-image-21660\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-23.png\" alt=\"IMG_285\" \/><\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"117\" height=\"27\" class=\"wp-image-21661\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-22.png\" alt=\"IMG_286\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"117\" height=\"27\" class=\"wp-image-21662\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-23.png\" alt=\"IMG_287\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"27\" class=\"wp-image-21663\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-23.png\" alt=\"IMG_288\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"117\" height=\"27\" class=\"wp-image-21664\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-24.png\" alt=\"IMG_289\" \/><\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>D<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"255\" height=\"34\" class=\"wp-image-21665\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-23.png\" alt=\"IMG_290\" \/> v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"27\" class=\"wp-image-21666\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-23.png\" alt=\"IMG_291\" \/> kh\u00f4ng song song v\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"52\" class=\"wp-image-21667\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-23.png\" alt=\"IMG_292\" \/> .<\/p>\n<p><strong>Vi\u0301 du\u0323 5:<\/strong> Hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"274\" height=\"30\" class=\"wp-image-21668\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-23.png\" alt=\"IMG_293\" \/> song song khi v\u00e0 ch\u1ec9 khi:<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"24\" class=\"wp-image-21669\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-23.png\" alt=\"IMG_294\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"24\" class=\"wp-image-21670\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-22.png\" alt=\"IMG_295\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"24\" class=\"wp-image-21671\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-22.png\" alt=\"IMG_296\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"24\" class=\"wp-image-21672\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-22.png\" alt=\"IMG_297\" \/><\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>C<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"214\" height=\"52\" class=\"wp-image-21673\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-22.png\" alt=\"IMG_298\" \/><\/p>\n<p>Khi <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-21674\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-22.png\" alt=\"IMG_299\" \/> ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"172\" height=\"52\" class=\"wp-image-21675\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-22.png\" alt=\"IMG_300\" \/><\/p>\n<p>Khi <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-21676\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-22.png\" alt=\"IMG_301\" \/> ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"199\" height=\"52\" class=\"wp-image-21677\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-22.png\" alt=\"IMG_302\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 6:<\/strong> Cho 3 \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"30\" class=\"wp-image-21678\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-22.png\" alt=\"IMG_303\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_303-22.png 450w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_303-22-300x20.png 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/> \u0110\u1ec3 ba \u0111\u01b0\u1eddng th\u1eb3ng n\u00e0y \u0111\u1ed3ng qui th\u00ec gi\u00e1 tr\u1ecb th\u00edch h\u1ee3p c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"19\" class=\"wp-image-21679\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-22.png\" alt=\"IMG_304\" \/> l\u00e0:<\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-21680\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-22.png\" alt=\"IMG_305\" \/> <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"24\" class=\"wp-image-21681\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-22.png\" alt=\"IMG_306\" \/> <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-21682\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-22.png\" alt=\"IMG_307\" \/> <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"24\" class=\"wp-image-21683\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-22.png\" alt=\"IMG_308\" \/><\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/strong><\/p>\n<p>Ch\u1ecdn <strong>B<\/strong>.<\/p>\n<p>Giao \u0111i\u00ea\u0309m cu\u0309a <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"30\" class=\"wp-image-21684\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-21.png\" alt=\"IMG_309\" \/> va\u0300 <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21685\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-22.png\" alt=\"IMG_310\" \/> la\u0300 nghi\u00ea\u0323m cu\u0309a h\u00ea\u0323 <img loading=\"lazy\" decoding=\"async\" width=\"212\" height=\"60\" class=\"wp-image-21686\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-21.png\" alt=\"IMG_311\" \/><\/p>\n<p>V\u00e2\u0323y <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"30\" class=\"wp-image-21687\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-21.png\" alt=\"IMG_312\" \/> c\u0103\u0301t <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21688\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-21.png\" alt=\"IMG_313\" \/> ta\u0323i <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21689\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-21.png\" alt=\"IMG_314\" \/><\/p>\n<p>\u0110\u00ea\u0309 3 \u0111\u01b0\u01a1\u0300ng th\u0103\u0309ng <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"30\" class=\"wp-image-21690\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-21.png\" alt=\"IMG_315\" \/> \u0111\u00f4\u0300ng quy thi\u0300 <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21691\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-21.png\" alt=\"IMG_316\" \/> pha\u0309i \u0111i qua \u0111i\u00ea\u0309m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"22\" class=\"wp-image-21692\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-21.png\" alt=\"IMG_317\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"24\" class=\"wp-image-21693\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-21.png\" alt=\"IMG_318\" \/> tho\u0309a ph\u01b0\u01a1ng tri\u0300nh <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"30\" class=\"wp-image-21694\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-21.png\" alt=\"IMG_319\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"24\" class=\"wp-image-21695\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-21.png\" alt=\"IMG_320\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 7: <\/strong>Cho <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-21696\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-20.png\" alt=\"IMG_321\" \/> \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"345\" height=\"27\" class=\"wp-image-21697\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-20.png\" alt=\"IMG_322\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_322-20.png 345w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_322-20-300x23.png 300w\" sizes=\"(max-width: 345px) 100vw, 345px\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 giao \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-21698\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-18.png\" alt=\"IMG_323\" \/> \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-21699\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-18.png\" alt=\"IMG_324\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-21700\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-18.png\" alt=\"IMG_325\" \/><\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"27\" class=\"wp-image-21701\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-18.png\" alt=\"IMG_326\" \/><strong> .<\/strong> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"85\" height=\"57\" class=\"wp-image-21702\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-18.png\" alt=\"IMG_327\" \/><\/p>\n<p><strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"27\" class=\"wp-image-21703\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-17.png\" alt=\"IMG_328\" \/><strong> .<\/strong> <strong>D. <\/strong>Kh\u00f4ng c\u00f3 giao \u0111i\u1ec3m.<\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>D<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-21704\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-17.png\" alt=\"IMG_329\" \/> c\u00f3 vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"105\" height=\"35\" class=\"wp-image-21705\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-17.png\" alt=\"IMG_330\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-21706\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-17.png\" alt=\"IMG_331\" \/> c\u00f3 vect\u01a1 ch\u1ec9 ph\u01b0\u01a1ng l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"107\" height=\"35\" class=\"wp-image-21707\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-17.png\" alt=\"IMG_332\" \/> .<\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"105\" height=\"35\" class=\"wp-image-21708\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-17.png\" alt=\"IMG_333\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"107\" height=\"35\" class=\"wp-image-21709\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-16.png\" alt=\"IMG_334\" \/> c\u00f9ng ph\u01b0\u01a1ng n\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-21710\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-16.png\" alt=\"IMG_335\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-21711\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-16.png\" alt=\"IMG_336\" \/> kh\u00f4ng c\u00f3 giao \u0111i\u1ec3m.<\/p>\n<p><strong>Vi\u0301 du\u0323 8: <\/strong>X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a 2 \u0111\u01b0\u1eddng th\u1eb3ng: <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"30\" class=\"wp-image-21712\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-16.png\" alt=\"IMG_337\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"104\" height=\"70\" class=\"wp-image-21713\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-16.png\" alt=\"IMG_338\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"30\" class=\"wp-image-21714\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-16.png\" alt=\"IMG_339\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"109\" height=\"70\" class=\"wp-image-21715\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-16.png\" alt=\"IMG_340\" \/><\/p>\n<p><strong>A. <\/strong>Song song nhau. <strong>B. <\/strong>C\u1eaft nhau nh\u01b0ng kh\u00f4ng vu\u00f4ng g\u00f3c.<\/p>\n<p><strong>C. <\/strong>Vu\u00f4ng g\u00f3c nhau. <strong>D. <\/strong>Tr\u00f9ng nhau.<\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn gi\u1ea3i<\/strong><\/p>\n<p>Ch\u1ecdn <strong>B<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"30\" class=\"wp-image-21716\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-16.png\" alt=\"IMG_341\" \/> c\u00f3 vtcp <img loading=\"lazy\" decoding=\"async\" width=\"125\" height=\"40\" class=\"wp-image-21717\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-16.png\" alt=\"IMG_342\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"30\" class=\"wp-image-21718\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-16.png\" alt=\"IMG_343\" \/> c\u00f3 vtcp <a id=\"post-21630-bookmark=id.30j0zll\"><\/a>..<a id=\"post-21630-bookmark=id.1fob9te\"><\/a><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"34\" class=\"wp-image-21719\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-16.png\" alt=\"IMG_344\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"34\" class=\"wp-image-21720\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-16.png\" alt=\"IMG_345\" \/> kh\u00f4ng c\u00f9ng ph\u01b0\u01a1ng v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"99\" height=\"34\" class=\"wp-image-21721\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-15.png\" alt=\"IMG_346\" \/> n\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"30\" class=\"wp-image-21722\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-14.png\" alt=\"IMG_347\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_347-14.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_347-14-50x30.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> C\u1eaft nhau nh\u01b0ng kh\u00f4ng vu\u00f4ng g\u00f3c<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u0301 du\u0323 1: X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng sau \u0111\u00e2y: : v\u00e0 : . A. Song song. B. Tr\u00f9ng nhau. C. Vu\u00f4ng g\u00f3c nhau. D. C\u1eaft nhau. H\u01b0\u1edbng d\u1eabn gi\u1ea3i Ch\u1ecdn A. C\u00e1ch 1: Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u1ea5y v\u00f4 nghi\u1ec7m n\u00ean hai \u0111\u01b0\u1eddng th\u1eb3ng song song C\u00e1ch 2: \u0110\u01b0\u1eddng th\u1eb3ng [&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":[42],"tags":[],"class_list":["post-21630","post","type-post","status-publish","format-standard","hentry","category-toan-lop-11"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21630","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=21630"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21630\/revisions"}],"predecessor-version":[{"id":21723,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21630\/revisions\/21723"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=21630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=21630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=21630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}