{"common":{"save":0,"post_id":"7820","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7673","post_id":"7820","mon_id":"1159278","chapter_id":"1159327","question":"<p>V\u1edbi x = <span class=\"math-tex\">sqrt26<\/span> giá tr\u1ecb bi\u1ec3u th\u1ee9c P = <span class=\"math-tex\">sqrtx−1.sqrtx+1<\/span> là:<\/p>","options":["<strong>A.<\/strong> P = 15","<strong>B.<\/strong> P = 5","<strong>C.<\/strong> P = <span class=\"math-tex\">5sqrt2<\/span>","<strong>D.<\/strong> P = <span class=\"math-tex\">5sqrt3<\/span>"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> P = 5<\/span><\/p><p>V\u1edbi x = <span class=\"math-tex\">sqrt26<\/span> giá tr\u1ecb bi\u1ec3u th\u1ee9c P = <span class=\"math-tex\">sqrtx−1.sqrtx+1<\/span> là:<\/p><p>P = <span class=\"math-tex\">sqrtsqrt26−1.sqrtsqrt26+1=sqrt(sqrt26−1)(sqrt26+1)=sqrt26−1=sqrt25=5<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-13 01:18:57","option_type":"math","len":0},{"id":"7675","post_id":"7820","mon_id":"1159278","chapter_id":"1159327","question":"<p>Giá tr\u1ecb c\u1ee7a <span class=\"math-tex\">sqrt9a2(b2+4−4b)<\/span> khi a = 2 và b = <span class=\"math-tex\">−sqrt3<\/span>, b\u1eb1ng s\u1ed1 nào sau \u0111ây:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">6.(sqrt3+2)<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">−6.(sqrt3+2)<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">6.(sqrt3−2)<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">3.(sqrt3+2)<\/span>"],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">6.(sqrt3+2)<\/span><\/span><\/p><p><span class=\"math-tex\">sqrt9a2(b2+4−4b)=<\/span> <span class=\"math-tex\">sqrt9.sqrta2.sqrt(b−2)2=<\/span> <span class=\"math-tex\">3.|a|.|b−2|<\/span><\/p><p>Giá tr\u1ecb c\u1ee7a <span class=\"math-tex\">sqrt9a2(b2+4−4b)<\/span> khi a = 2 và b = <span class=\"math-tex\">−sqrt3<\/span> là:<\/p><p><span class=\"math-tex\">3.|a|.|b−2|=<\/span> <span class=\"math-tex\">3.2.|−sqrt3−2|=<\/span><span class=\"math-tex\">6.(sqrt3+2)<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-13 01:24:50","option_type":"math","len":0},{"id":"7678","post_id":"7820","mon_id":"1159278","chapter_id":"1159327","question":"<p>Tính giá tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c <span class=\"math-tex\">P=dfracx−2sqrtxsqrtx−2<\/span> bi\u1ebft 2x – 5 = 7.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">P=−sqrt6<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">P=1<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">P=6<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">P=sqrt6<\/span>"],"correct":"4","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">P=sqrt6<\/span><\/span><\/p><p>2x – 5 = 7 suy ra x = 6. Khi \u0111ó thay x = 6 vào P ta \u0111\u01b0\u1ee3c:<\/p><p><span class=\"math-tex\">P=dfrac6−2sqrt6sqrt6−2=dfracsqrt6(sqrt6−2)sqrt6−2=sqrt6<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-13 01:34:47","option_type":"math","len":0}]}