{"common":{"save":0,"post_id":"6665","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6831","post_id":"6665","mon_id":"1158921","chapter_id":"1158939","question":"<p>Bi\u1ebft \u25b3ABC<span class=\"math-tex\">$\\backsim$<\/span>\u25b3MNP theo t\u1ec9 s\u1ed1 2 và MP = 4 cm. Tính AC .<\/p>","options":["<strong>A.<\/strong> 2 cm","<strong>B.<\/strong> 4 cm","<strong>C.<\/strong> 8 cm","<strong>D.<\/strong> 6 cm"],"correct":"3","level":"3","hint":"","answer":"<p>Vì \u25b3ABC<span class=\"math-tex\">$\\backsim$<\/span>\u25b3MNP theo t\u1ec9 s\u1ed1 2 nên <span class=\"math-tex\">$\\dfrac{AC}{MP}=2$<\/span> ⇒ AC = 2.MP = 2.4 = 8 cm.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>C.<\/strong> 8 cm.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-09-03 07:12:43","option_type":"txt","len":0},{"id":"6834","post_id":"6665","mon_id":"1158921","chapter_id":"1158939","question":"<p>Cho <span class=\"math-tex\">$\u25b3ABC\\backsim\u25b3MNP$<\/span>. Bi\u1ebft \u25b3ABC cân t\u1ea1i A. Câu nào sau \u0111ây là <strong>\u0111úng<\/strong>?<\/p>","options":["<strong>A.<\/strong> \u25b3MNP cân t\u1ea1i M","<strong>B.<\/strong> \u25b3MNP cân t\u1ea1i N","<strong>C.<\/strong> \u25b3MNP cân t\u1ea1i P","<strong>D.<\/strong> \u25b3MNP không ph\u1ea3i tam giác cân"],"correct":"1","level":"3","hint":"","answer":"<p>Vì <span class=\"math-tex\">$\u25b3ABC\\backsim\u25b3MNP$<\/span> nên <span class=\"math-tex\">$\\widehat{B}=\\widehat{N};\\widehat{C}=\\widehat{P}$<\/span> <\/p><p>Mà <span class=\"math-tex\">$\\widehat{B}=\\widehat{C}$<\/span> (\u25b3ABC cân t\u1ea1i A) <\/p><p>Suy ra <span class=\"math-tex\">$\\widehat{N}=\\widehat{P}$<\/span><\/p><p>V\u1eady <span style=\"color:#16a085;\"><strong>A.<\/strong> \u25b3MNP cân t\u1ea1i M .<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-09-03 07:23:01","option_type":"txt","len":2},{"id":"6837","post_id":"6665","mon_id":"1158921","chapter_id":"1158939","question":"<p>Cho \u25b3ABC<span class=\"math-tex\">$\\backsim$<\/span>\u25b3DEF . Bi\u1ebft \u25b3DEF là tam giác \u0111\u1ec1u. Câu nào <strong>\u0111úng nh\u1ea5t<\/strong>?<\/p>","options":["<strong>A.<\/strong> \u25b3ABC cân t\u1ea1i A","<strong>B.<\/strong> \u25b3ABC cân t\u1ea1i B","<strong>C.<\/strong> \u25b3ABC cân t\u1ea1i C","<strong>D.<\/strong> \u25b3ABC \u0111\u1ec1u"],"correct":"4","level":"3","hint":"","answer":"<p>Vì \u25b3ABC\u25b3<span class=\"math-tex\">$\\backsim$<\/span>DEF nên <span class=\"math-tex\">$\\widehat{A}=\\widehat{D};\\widehat{B}=\\widehat{E};\\widehat{C}=\\widehat{F}$<\/span> .<\/p><p>Mà <span class=\"math-tex\">$\\widehat{D}=\\widehat{E}=\\widehat{F}=60^0$<\/span> (\u25b3DEF \u0111\u1ec1u).<\/p><p>⇒ <span class=\"math-tex\">$\\widehat{A}=\\widehat{B}=\\widehat{C}=60^0$<\/span> .<\/p><p>⇒ <span style=\"color:#16a085;\"><strong>D.<\/strong> \u25b3ABC \u0111\u1ec1u <\/span> là \u0111áp án \u0111úng nh\u1ea5t.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-09-03 07:30:06","option_type":"txt","len":2}]}
