{"common":{"save":0,"post_id":"6586","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6253","post_id":"6586","mon_id":"1158921","chapter_id":"1158932","question":"<p>Ch\u1ecdn phát bi\u1ec3u <strong>\u0111úng<\/strong>.<\/p>","options":["<strong>A.<\/strong> \u0110\u01b0\u1eddng trung bình c\u1ee7a tam giác thì song song v\u1edbi m\u1ed9t c\u1ea1nh c\u1ee7a tam giác và b\u1eb1ng n\u1eeda c\u1ea1nh \u1ea5y.","<strong>B.<\/strong> \u0110\u01b0\u1eddng trung bình c\u1ee7a tam giác thì song song v\u1edbi hai c\u1ea1nh c\u1ee7a tam giác và b\u1eb1ng n\u1eeda c\u1ea1nh còn l\u1ea1i.","<strong>C.<\/strong> \u0110\u01b0\u1eddng trung bình c\u1ee7a tam giác thì vuông góc v\u1edbi m\u1ed9t c\u1ea1nh c\u1ee7a tam giác và b\u1eb1ng n\u1eeda c\u1ea1nh \u1ea5y.","<strong>D.<\/strong> \u0110\u01b0\u1eddng trung bình c\u1ee7a tam giác thì song song v\u1edbi m\u1ed9t c\u1ea1nh c\u1ee7a tam giác và b\u1eb1ng c\u1ea1nh \u1ea5y."],"correct":"1","level":"1","hint":"","answer":"<p>Phát bi\u1ec3u \u0111úng là <span style=\"color:#16a085;\"><strong>A.<\/strong> \u0110\u01b0\u1eddng trung bình c\u1ee7a tam giác thì song song v\u1edbi m\u1ed9t c\u1ea1nh c\u1ee7a tam giác và b\u1eb1ng n\u1eeda c\u1ea1nh \u1ea5y.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-08-09 13:22:04","option_type":"txt","len":3},{"id":"6255","post_id":"6586","mon_id":"1158921","chapter_id":"1158932","question":"<p>Cho AB = 3 cm và CD = 30 mm. <\/p><p>Tính t\u1ec9 s\u1ed1 <span class=\"math-tex\">$\\dfrac{AB}{CD}$<\/span> .<\/p>","options":["<strong>A.<\/strong> 10","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{10}$<\/span>","<strong>C.<\/strong> 1 cm","<strong>D.<\/strong> 1"],"correct":"4","level":"1","hint":"<p>T\u1ec9 s\u1ed1 c\u1ee7a hai \u0111o\u1ea1n th\u1eb3ng là t\u1ec9 s\u1ed1 \u0111\u1ed9 dài c\u1ee7a chúng theo cùng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o.<\/p><p>T\u1ec9 s\u1ed1 c\u1ee7a hai \u0111o\u1ea1n th\u1eb3ng không có \u0111\u01a1n v\u1ecb.<\/p>","answer":"<p>\u0110\u1ed5i CD = 30 mm = 3 cm.<\/p><p>T\u1ec9 s\u1ed1 c\u1ee7a hai \u0111o\u1ea1n th\u1eb3ng AB và CD là <\/p><p><span class=\"math-tex\">$\\dfrac{AB}{CD}$<\/span> = <span class=\"math-tex\">$\\dfrac{3\\text{ }cm}{3\\text{ }cm}$<\/span> = 1.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D.<\/strong> 1.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-08-09 13:26:08","option_type":"math","len":0},{"id":"6256","post_id":"6586","mon_id":"1158921","chapter_id":"1158932","question":"<p>Cho AB = 3 cm, CD = 5 cm, MN = 9 cm. Tính \u0111\u1ed9 dài c\u1ee7a \u0111o\u1ea1n th\u1eb3ng PQ \u0111\u1ec3 hai \u0111o\u1ea1n th\u1eb3ng AB và CD t\u1ec9 l\u1ec7 v\u1edbi hai \u0111o\u1ea1n th\u1eb3ng MN và PQ.<\/p>","options":["<strong>A.<\/strong> 3 cm","<strong>B.<\/strong> 15 cm","<strong>C.<\/strong> 6 cm","<strong>D.<\/strong> 10 cm"],"correct":"2","level":"1","hint":"","answer":"<p>Vì hai \u0111o\u1ea1n th\u1eb3ng AB và CD t\u1ec9 l\u1ec7 v\u1edbi hai \u0111o\u1ea1n th\u1eb3ng MN và PQ nên<\/p><p><span class=\"math-tex\">$\\dfrac{AB}{CD}=\\dfrac{MN}{PQ}$<\/span> suy ra PQ = <span class=\"math-tex\">$\\dfrac{CD.MN}{AB}$<\/span> = <span class=\"math-tex\">$\\dfrac{5.9}{3}$<\/span> = 15 cm.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B.<\/strong> 15 cm.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-08-09 13:30:35","option_type":"txt","len":0}]}
