{"common":{"save":0,"post_id":"8000","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8636","post_id":"8000","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho h&agrave;m s\u1ed1 y = 2x&sup2; c&oacute; \u0111\u1ed3 th\u1ecb l&agrave; (P), c&aacute;c \u0111i\u1ec3m thu\u1ed9c (P)&nbsp;c&oacute; tung \u0111\u1ed9 b\u1eb1ng 4 l&agrave;:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$(\\sqrt{2};4),(-\\sqrt{2};4)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$(2;4),(-2;4)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$(4;4),(-4;4)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$(1;4),(-1;4)$<\/span>"],"correct":"1","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$(\\sqrt{2};4),(-\\sqrt{2};4)$<\/span>.<\/span><\/p><p>Thay y = 4 ta \u0111\u01b0\u1ee3c&nbsp;<span class=\"math-tex\">$4=2x^2$<\/span>&nbsp;suy ra&nbsp;<span class=\"math-tex\">$x=\\pm\\sqrt{2}$<\/span>.<\/p><p>V\u1eady c&aacute;c \u0111i\u1ec3m th\u1ecfa m&atilde;n b&agrave;i to&aacute;n l&agrave;&nbsp;<span class=\"math-tex\">$(\\sqrt{2};4),(-\\sqrt{2};4)$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-17 09:46:49","option_type":"math","len":0},{"id":"8639","post_id":"8000","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho h&agrave;m s\u1ed1 <span class=\"math-tex\">$y=f(x)=-2x^2$<\/span>. Bi\u1ebft <span class=\"math-tex\">$f(a)=-10+4\\sqrt{6}$<\/span>, gi&aacute; tr\u1ecb c\u1ee7a a l&agrave;:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\pm(\\sqrt{3}-\\sqrt{2})$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\pm(\\sqrt{3}+\\sqrt{2})$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\pm\\sqrt{3}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\pm\\sqrt{2}$<\/span>"],"correct":"1","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\pm(\\sqrt{3}-\\sqrt{2})$<\/span>.<\/span><\/p><p>V&igrave;&nbsp;<span class=\"math-tex\">$f(a)=-10+4\\sqrt{6}$<\/span>&nbsp;n&ecirc;n&nbsp;<span class=\"math-tex\">$-2a^2=-2(5-2\\sqrt{6})$<\/span>.<\/p><p>Suy ra&nbsp;<span class=\"math-tex\">$a^2=(\\sqrt{3}-\\sqrt{2})^2$<\/span>.<\/p><p>Hay a =&nbsp;<span style=\"color:#16a085;\"><span class=\"math-tex\">$\\pm(\\sqrt{3}-\\sqrt{2})$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-17 09:55:34","option_type":"math","len":0},{"id":"8640","post_id":"8000","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho h&agrave;m s\u1ed1 <span class=\"math-tex\">$y=ax^2$<\/span>&nbsp;(a&nbsp;<span class=\"math-tex\">$\\ne$<\/span>&nbsp;0) c&oacute; \u0111\u1ed3 th\u1ecb l&agrave; Parabol (P). X&aacute;c \u0111\u1ecbnh a&nbsp;\u0111\u1ec3 (P) \u0111i qua \u0111i\u1ec3m&nbsp;<span class=\"math-tex\">$A(-\\sqrt{2};4)$<\/span>?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$a=-\\sqrt{2}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$a=\\sqrt{2}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$a=-2$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$a=2$<\/span>"],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$a=2$<\/span>.<\/span><\/p><p>Thay&nbsp;<span class=\"math-tex\">$x=-\\sqrt{2};y=4$<\/span>&nbsp;ta \u0111\u01b0\u1ee3c&nbsp;<span class=\"math-tex\">$a.2=4$<\/span>&nbsp;suy ra a = 2.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-17 09:59:13","option_type":"math","len":0}]}