{"id":21400,"date":"2021-12-17T16:25:05","date_gmt":"2021-12-17T09:25:05","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=21400"},"modified":"2021-12-17T16:25:08","modified_gmt":"2021-12-17T09:25:08","slug":"duong-thang-song-song-voi-mat-phang","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/duong-thang-song-song-voi-mat-phang\/","title":{"rendered":"\u0110\u01af\u1edcNG TH\u1eb2NG SONG SONG V\u1edaI M\u1eb6T PH\u1eb2NG"},"content":{"rendered":"<p><strong>1. V\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng.<\/strong><\/p>\n<p>Cho \u0111\u01b0\u1eddng th\u1eb3ng <a id=\"post-21400-MTBlankEqn\"><\/a> <img decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21401\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-22.png\" alt=\"IMG_256\" \/> v\u00e0 m\u1eb7t ph\u1eb3ng <img decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21402\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-21.png\" alt=\"IMG_257\" \/> , ta c\u00f3 ba v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa ch\u00fang l\u00e0:<\/p>\n<ul>\n<li><img decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21403\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-22.png\" alt=\"IMG_258\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21404\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-20.png\" alt=\"IMG_259\" \/> c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"22\" class=\"wp-image-21405\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-22.png\" alt=\"IMG_260\" \/> , k\u00ed hi\u00eau <img loading=\"lazy\" decoding=\"async\" width=\"125\" height=\"34\" class=\"wp-image-21406\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-19.png\" alt=\"IMG_261\" \/> ho\u1eb7c \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n ta k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"109\" height=\"34\" class=\"wp-image-21407\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-20.png\" alt=\"IMG_262\" \/> (h1)<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21408\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-21.png\" alt=\"IMG_263\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21409\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-20.png\" alt=\"IMG_264\" \/> , k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"34\" class=\"wp-image-21410\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-20.png\" alt=\"IMG_265\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"34\" class=\"wp-image-21411\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-20.png\" alt=\"IMG_266\" \/> ( h2)<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21412\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-21.png\" alt=\"IMG_267\" \/> n\u1eb1m trong <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21413\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-21.png\" alt=\"IMG_268\" \/> , k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21414\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-21.png\" alt=\"IMG_269\" \/> (h3)<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"155\" height=\"146\" class=\"wp-image-21415\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-19.png\" alt=\"IMG_270\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"180\" height=\"108\" class=\"wp-image-21416\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-21.png\" alt=\"IMG_271\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"168\" height=\"141\" class=\"wp-image-21417\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-21.png\" alt=\"IMG_272\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>2. C\u00e1c \u0111\u1ecbnh l\u00ed v\u00e0 t\u00ednh ch\u1ea5t.<\/strong><\/p>\n<ul>\n<li>N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21418\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-19.png\" alt=\"IMG_273\" \/> kh\u00f4ng n\u1eb1m trong m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21419\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-21.png\" alt=\"IMG_274\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21420\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-20.png\" alt=\"IMG_275\" \/> song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"24\" class=\"wp-image-21421\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-21.png\" alt=\"IMG_276\" \/> n\u1eb1n trong <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21422\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-21.png\" alt=\"IMG_277\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21423\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-21.png\" alt=\"IMG_278\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21424\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-19.png\" alt=\"IMG_279\" \/> .<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td>V\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"170\" height=\"100\" class=\"wp-image-21425\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-21.png\" alt=\"IMG_280\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"132\" class=\"wp-image-21426\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-20.png\" alt=\"IMG_281\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr>\n<td>\n<ul>\n<li>Cho \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21427\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-21.png\" alt=\"IMG_282\" \/> \u00a0song song v\u1edbi m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21428\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-20.png\" alt=\"IMG_283\" \/> . N\u1ebfu m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21429\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-20.png\" alt=\"IMG_284\" \/> \u00a0\u0111i qua <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21430\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-21.png\" alt=\"IMG_285\" \/> \u00a0v\u00e0 c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21431\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-20.png\" alt=\"IMG_286\" \/> \u00a0theo giao tuy\u1ebfn <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"24\" class=\"wp-image-21432\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-21.png\" alt=\"IMG_287\" \/> \u00a0th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"27\" class=\"wp-image-21433\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-21.png\" alt=\"IMG_288\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_288-21.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_288-21-50x27.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> .<\/li>\n<\/ul>\n<p>V\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"104\" class=\"wp-image-21434\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-22.png\" alt=\"IMG_289\" \/> .<\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"219\" height=\"160\" class=\"wp-image-21435\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-21.png\" alt=\"IMG_290\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr>\n<td>\n<ul>\n<li>N\u1ebfu hai m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng th\u00ec giao tuy\u1ebfn c\u1ee7a ch\u00fang ( n\u1ebfu c\u00f3) c\u0169ng song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3.<\/li>\n<\/ul>\n<p>V\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"104\" class=\"wp-image-21436\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-21.png\" alt=\"IMG_291\" \/> .<\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"241\" class=\"wp-image-21437\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-21.png\" alt=\"IMG_292\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr>\n<td>\n<ul>\n<li>Cho hai \u0111\u01b0\u1eddng th\u1eb3ng ch\u00e9o nhau. C\u00f3 duy nh\u1ea5t m\u1ed9t m\u1eb7t ph\u1eb3ng ch\u1ee9a \u0111\u01b0\u1eddng th\u1eb3ng n\u00e0y v\u00e0 song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng kia.<\/li>\n<\/ul>\n<\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"240\" height=\"240\" class=\"wp-image-21438\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-21.png\" alt=\"IMG_293\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_293-21.png 240w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_293-21-150x150.png 150w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_293-21-50x50.png 50w\" sizes=\"(max-width: 240px) 100vw, 240px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>C\u00e2u 1: <\/strong>Cho m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21439\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-21.png\" alt=\"IMG_294\" \/> v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21440\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-20.png\" alt=\"IMG_295\" \/> . Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y <strong>sai<\/strong>?<\/p>\n<p><strong>A. <\/strong>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21441\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-20.png\" alt=\"IMG_296\" \/> th\u00ec trong <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21442\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-20.png\" alt=\"IMG_297\" \/> t\u1ed3n t\u1ea1i \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"34\" class=\"wp-image-21443\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-20.png\" alt=\"IMG_298\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"24\" class=\"wp-image-21444\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-20.png\" alt=\"IMG_299\" \/> .<\/p>\n<p><strong>B. <\/strong>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21445\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-20.png\" alt=\"IMG_300\" \/> v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"34\" class=\"wp-image-21446\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-20.png\" alt=\"IMG_301\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"24\" class=\"wp-image-21447\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-20.png\" alt=\"IMG_302\" \/> .<\/p>\n<p><strong>C. <\/strong>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"100\" height=\"34\" class=\"wp-image-21448\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-20.png\" alt=\"IMG_303\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"34\" class=\"wp-image-21449\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-20.png\" alt=\"IMG_304\" \/> .<\/p>\n<p><strong>D. <\/strong>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"34\" class=\"wp-image-21450\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-20.png\" alt=\"IMG_305\" \/> v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"75\" height=\"34\" class=\"wp-image-21451\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-20.png\" alt=\"IMG_306\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21452\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-20.png\" alt=\"IMG_307\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"24\" class=\"wp-image-21453\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-20.png\" alt=\"IMG_308\" \/> ho\u1eb7c c\u1eaft nhau ho\u1eb7c ch\u00e9o nhau.<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>\u0110\u00e1p \u00e1n B.<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td>Khi <img loading=\"lazy\" decoding=\"async\" width=\"85\" height=\"34\" class=\"wp-image-21454\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-19.png\" alt=\"IMG_309\" \/> \u00a0v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"84\" height=\"34\" class=\"wp-image-21455\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-20.png\" alt=\"IMG_310\" \/> \u00a0th\u00ec ngo\u00e0i tr\u01b0\u1eddng h\u1ee3p <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"34\" class=\"wp-image-21456\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-19.png\" alt=\"IMG_311\" \/> \u00a0c\u00f2n c\u00f3 tr\u01b0\u1eddng h\u1ee3p <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"34\" class=\"wp-image-21457\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-19.png\" alt=\"IMG_312\" \/> \u00a0v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"34\" class=\"wp-image-21458\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-19.png\" alt=\"IMG_313\" \/> \u00a0ch\u00e9o nhau.<\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"255\" height=\"203\" class=\"wp-image-21459\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-19.png\" alt=\"IMG_314\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>C\u00e2u 2: <\/strong>Cho hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21460\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-19.png\" alt=\"IMG_315\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21461\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-19.png\" alt=\"IMG_316\" \/> c\u00f9ng song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21462\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-19.png\" alt=\"IMG_317\" \/> . <em>Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y <\/em><strong><em>kh\u00f4ng sai?<\/em><\/strong><\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-21463\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-19.png\" alt=\"IMG_318\" \/> .<\/p>\n<p><strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21464\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-19.png\" alt=\"IMG_319\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21465\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-19.png\" alt=\"IMG_320\" \/> c\u1eaft nhau.<\/p>\n<p><strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21466\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-18.png\" alt=\"IMG_321\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21467\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-18.png\" alt=\"IMG_322\" \/> ch\u00e9o nhau.<\/p>\n<p><strong>D.<\/strong> Ch\u01b0a \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 k\u1ebft lu\u1eadn v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21468\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-16.png\" alt=\"IMG_323\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21469\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-16.png\" alt=\"IMG_324\" \/> .<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"359\" height=\"137\" class=\"wp-image-21470\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-16.png\" alt=\"IMG_325\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_325-16.png 359w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_325-16-300x114.png 300w\" sizes=\"(max-width: 359px) 100vw, 359px\" \/><strong>Ch\u1ecdn D.<\/strong><\/p>\n<p>Cho <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21471\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-16.png\" alt=\"IMG_326\" \/> qua <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"27\" class=\"wp-image-21472\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-16.png\" alt=\"IMG_327\" \/> kh\u00f4ng th\u1eb3ng h\u00e0ng.<\/p>\n<p>Gi\u1ea3 s\u1eed <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"27\" class=\"wp-image-21473\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-15.png\" alt=\"IMG_328\" \/> ph\u00e2n bi\u1ec7t l\u00e0 c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng n\u1eb1m ngo\u00e0i <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21474\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-15.png\" alt=\"IMG_329\" \/> th\u1ecfa <img loading=\"lazy\" decoding=\"async\" width=\"195\" height=\"27\" class=\"wp-image-21475\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-15.png\" alt=\"IMG_330\" \/><\/p>\n<p>Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"24\" class=\"wp-image-21476\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-15.png\" alt=\"IMG_331\" \/><\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21477\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-15.png\" alt=\"IMG_332\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-21478\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-15.png\" alt=\"IMG_333\" \/> \u0111\u1ed3ng ph\u1eb3ng th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21479\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-14.png\" alt=\"IMG_334\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"19\" class=\"wp-image-21480\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-14.png\" alt=\"IMG_335\" \/><\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21481\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-14.png\" alt=\"IMG_336\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-21482\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-14.png\" alt=\"IMG_337\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21483\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-14.png\" alt=\"IMG_338\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-21484\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-14.png\" alt=\"IMG_339\" \/> ch\u00e9o nhau.<\/p>\n<p><strong>C\u00e2u 3:<\/strong> <em>Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/em><\/p>\n<p><strong>A.<\/strong> \u0110\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"97\" height=\"34\" class=\"wp-image-21485\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-14.png\" alt=\"IMG_340\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"34\" class=\"wp-image-21486\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-14.png\" alt=\"IMG_341\" \/> \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-21487\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-14.png\" alt=\"IMG_342\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"20\" class=\"wp-image-21488\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-14.png\" alt=\"IMG_343\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"24\" class=\"wp-image-21489\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-14.png\" alt=\"IMG_344\" \/><\/p>\n<p><strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"34\" class=\"wp-image-21490\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-14.png\" alt=\"IMG_345\" \/> T\u1ed3n t\u1ea1i \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"167\" height=\"34\" class=\"wp-image-21491\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-13.png\" alt=\"IMG_346\" \/><\/p>\n<p><strong>C.<\/strong> N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-21492\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-13.png\" alt=\"IMG_347\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21493\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-13.png\" alt=\"IMG_348\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21494\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-13.png\" alt=\"IMG_349\" \/> c\u1eaft \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21495\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-13.png\" alt=\"IMG_350\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-21496\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-13.png\" alt=\"IMG_351\" \/> c\u1eaft \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"19\" class=\"wp-image-21497\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-13.png\" alt=\"IMG_352\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"244\" height=\"161\" class=\"wp-image-21498\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-13.png\" alt=\"IMG_353\" \/><strong>D.<\/strong> Hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng th\u00ec 2 \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3 song song nhau.<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>Ch\u1ecdn B.<\/strong><\/p>\n<p>Ta c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"184\" height=\"67\" class=\"wp-image-21499\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-13.png\" alt=\"IMG_354\" \/><\/p>\n<p><strong>C\u00e2u 4: <\/strong>Cho <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21500\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-13.png\" alt=\"IMG_355\" \/> v\u00e0 hai \u0111\u01b0\u1eddng th\u1eb3ng song song <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21501\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-13.png\" alt=\"IMG_356\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21502\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-13.png\" alt=\"IMG_357\" \/><\/p>\n<p><em>Ghi \u0110 (\u0111\u00fang) ho\u1eb7c S (sai) v\u00e0o \u00f4 vu\u00f4ng trong c\u00e1c m\u1ec7nh \u0111\u1ec1 sau:<\/em><\/p>\n<p><strong>A.<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21503\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-13.png\" alt=\"IMG_358\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21504\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-13.png\" alt=\"IMG_359\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"34\" class=\"wp-image-21505\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-13.png\" alt=\"IMG_360\" \/> \u00a3<\/p>\n<p><strong>B.<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21506\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-13.png\" alt=\"IMG_361\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21507\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-13.png\" alt=\"IMG_362\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21508\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-11.png\" alt=\"IMG_363\" \/> ch\u1ee9a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21509\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-13.png\" alt=\"IMG_364\" \/> \u00a3<\/p>\n<p><strong>C.<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21510\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-13.png\" alt=\"IMG_365\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21511\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-13.png\" alt=\"IMG_366\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"34\" class=\"wp-image-21512\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-13.png\" alt=\"IMG_367\" \/> ho\u1eb7c ch\u1ee9a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21513\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_368-13.png\" alt=\"IMG_368\" \/> \u00a3<\/p>\n<p><strong>D.<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21514\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_369-13.png\" alt=\"IMG_369\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21515\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_370-13.png\" alt=\"IMG_370\" \/> th\u00ec c\u0169ng c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21516\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_371-13.png\" alt=\"IMG_371\" \/> \u00a3<\/p>\n<p><strong>E.<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21517\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_372-13.png\" alt=\"IMG_372\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21518\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_373-12.png\" alt=\"IMG_373\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21519\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_374-12.png\" alt=\"IMG_374\" \/> c\u00f3 th\u1ec3 song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21520\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_375-12.png\" alt=\"IMG_375\" \/> \u00a3<\/p>\n<p><strong>F.<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-21521\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_376-11.png\" alt=\"IMG_376\" \/> ch\u1ee9a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21522\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_377-10.png\" alt=\"IMG_377\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21523\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_378-9.png\" alt=\"IMG_378\" \/> c\u00f3 th\u1ec3 song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21524\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_379-9.png\" alt=\"IMG_379\" \/> \u00a3<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"302\" height=\"263\" class=\"wp-image-21525\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_380-9.png\" alt=\"IMG_380\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_380-9.png 302w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_380-9-300x261.png 300w\" sizes=\"(max-width: 302px) 100vw, 302px\" \/> Ch\u1ecdn C.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"254\" height=\"67\" class=\"wp-image-21526\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_381-9.png\" alt=\"IMG_381\" \/><\/p>\n<p>Ch\u1ecdn D.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21527\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_382-9.png\" alt=\"IMG_382\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21528\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_383-9.png\" alt=\"IMG_383\" \/> suy ra <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21529\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_384-9.png\" alt=\"IMG_384\" \/> kh\u00f4ng song song <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21530\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_385-9.png\" alt=\"IMG_385\" \/> m\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21531\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_386-9.png\" alt=\"IMG_386\" \/> c\u0169ng kh\u00f4ng ch\u1ee9a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21532\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_387-8.png\" alt=\"IMG_387\" \/> , v\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21533\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_388-6.png\" alt=\"IMG_388\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21534\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_389-5.png\" alt=\"IMG_389\" \/> .<\/p>\n<p>Ch\u1ecdn <strong>F.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"174\" height=\"100\" class=\"wp-image-21535\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_390-6.png\" alt=\"IMG_390\" \/><\/p>\n<p><strong>C\u00e2u 5: <\/strong>Trong kh\u00f4ng gian c\u00f3 bao nhi\u00eau v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng?<\/p>\n<p><strong>A. <\/strong>1. <strong>B. <\/strong>2. <strong>C. <\/strong>3. <strong>D. <\/strong>4.<\/p>\n<p><strong><em>H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em><\/strong><\/p>\n<p><strong>Ch\u1ecdn C.<\/strong><\/p>\n<p>V\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng l\u00e0<\/p>\n<p>\u00b7 \u0110\u01b0\u1eddng th\u1eb3ng n\u1eb1m trong m\u1eb7t ph\u1eb3ng.<\/p>\n<p>\u00b7 \u0110\u01b0\u1eddng th\u1eb3ng song song v\u1edbi m\u1eb7t ph\u1eb3ng.<\/p>\n<p>\u00b7 \u0110\u01b0\u1eddng th\u1eb3ng c\u1eaft m\u1eb7t ph\u1eb3ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. V\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng. Cho \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng , ta c\u00f3 ba v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa ch\u00fang l\u00e0: v\u00e0 c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m , k\u00ed hi\u00eau ho\u1eb7c \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n ta k\u00ed hi\u1ec7u (h1) song song v\u1edbi , k\u00ed hi\u1ec7u ho\u1eb7c ( h2) n\u1eb1m trong [&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-21400","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\/21400","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=21400"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21400\/revisions"}],"predecessor-version":[{"id":21536,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21400\/revisions\/21536"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=21400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=21400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=21400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}