{"common":{"save":0,"post_id":"7381","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7031","post_id":"7381","mon_id":"1159278","chapter_id":"1159281","question":"<p>Gi&aacute; tr\u1ecb n&agrave;o c\u1ee7a m&nbsp;d\u01b0\u1edbi \u0111&acirc;y \u0111\u1ec3 \u0111i\u1ec3m <span style=\"color:#2980b9;\"><strong>M(2; 1)<\/strong><\/span>&nbsp;thu\u1ed9c&nbsp;\u0111\u1ed3 th\u1ecb (D)&nbsp;c\u1ee7a ph\u01b0\u01a1ng tr&igrave;nh <span style=\"color:#c0392b;\"><strong>mx&nbsp;&ndash; 3y = 5<\/strong><\/span>?<\/p>","options":["<strong>A.<\/strong> &ndash;3","<strong>B.<\/strong> 3","<strong>C.<\/strong> 4","<strong>D.<\/strong> &ndash;5"],"correct":"3","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;4<\/span><\/p><p>Thay x = 2, y = 1 v&agrave;o ph\u01b0\u01a1ng tr&igrave;nh ta \u0111\u01b0\u1ee3c 2m&nbsp;&ndash; 3 = 5 suy ra m = 4.<\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"127","test":"0","date":"2024-10-01 02:10:04","option_type":"txt","len":0},{"id":"7033","post_id":"7381","mon_id":"1159278","chapter_id":"1159281","question":"<p>Cho hai ph\u01b0\u01a1ng tr&igrave;nh: <span class=\"math-tex\">$x-2y=-10$<\/span> v&agrave; <span class=\"math-tex\">$x+y=-1$<\/span>.&nbsp;Nghi\u1ec7m chung c\u1ee7a hai ph\u01b0\u01a1ng tr&igrave;nh l&agrave;<\/p>","options":["<strong>A.<\/strong> (&ndash;2; 5)","<strong>B.<\/strong> (&ndash;8; 4)","<strong>C.<\/strong> (7; &ndash;3)","<strong>D.<\/strong> (&ndash;4; 3)"],"correct":"4","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;(&ndash;4; 3)<\/span><\/p><p>Ta c&oacute;: <span class=\"math-tex\">$-4-2.3=-10$<\/span>&nbsp;n&ecirc;n <span style=\"color:#16a085;\">(&ndash;4; 3)&nbsp;<\/span>l&agrave; nghi\u1ec7m&nbsp;c\u1ee7a ph\u01b0\u01a1ng tr&igrave;nh <span class=\"math-tex\">$x-2y=-10$<\/span>.<\/p><p>Ta c&oacute;: <span class=\"math-tex\">$-4+3=-1$<\/span>&nbsp;n&ecirc;n <span style=\"color:#16a085;\">(&ndash;4; 3)&nbsp;<\/span>l&agrave; nghi\u1ec7m&nbsp;c\u1ee7a ph\u01b0\u01a1ng tr&igrave;nh <span class=\"math-tex\">$x+y=-1$<\/span>.<\/p><p>V\u1eady&nbsp;<span style=\"color:#16a085;\">(&ndash;4; 3)<\/span> l&agrave; nghi\u1ec7m&nbsp;chung c\u1ee7a hai ph\u01b0\u01a1ng tr&igrave;nh tr&ecirc;n.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-01 02:18:38","option_type":"txt","len":2},{"id":"7034","post_id":"7381","mon_id":"1159278","chapter_id":"1159281","question":"<p>T&igrave;m&nbsp;a v&agrave; b \u0111\u1ec3 (&ndash;2; 3)&nbsp;l&agrave; nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr&igrave;nh <span class=\"math-tex\">$\\begin{cases}ax+y=5\\\\3x+by=0\\end{cases}$<\/span>.<\/p>","options":["<strong>A.<\/strong> (a; b) = (&ndash;2; 1)","<strong>B.<\/strong> (a; b) = (&ndash;1; 2)","<strong>C.<\/strong> (a; b) = (&ndash;3; 3)","<strong>D.<\/strong> (a; b) = (2; &ndash;4)"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;(a; b) = (&ndash;1; 2)<\/span><\/p><p>Thay x =&nbsp;&ndash;2, y = 3&nbsp;ta c&oacute;:&nbsp;<span class=\"math-tex\">$\\begin{cases}-2a+3=5\\\\3.(-2)+3b=0\\end{cases}$<\/span>&nbsp;suy ra <span class=\"math-tex\">$\\begin{cases}a=-1\\\\b=2\\end{cases}$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-01 02:19:30","option_type":"txt","len":2}]}