{"common":{"save":0,"post_id":"7750","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7052","post_id":"7750","mon_id":"1159278","chapter_id":"1159281","question":"<p>H\u1ec7 ph\u01b0\u01a1ng trình nào d\u01b0\u1edbi \u0111ây là h\u1ec7 ph\u01b0\u01a1ng trình b\u1eadc nh\u1ea5t hai \u1ea9n?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\begin{cases}5x-2y=1\\\\4xy=2\\end{cases}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\begin{cases}0x-0y=5\\\\5x-2y=3\\end{cases}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\begin{cases}5x+\\dfrac{2}{y}=3\\\\4x+y=2\\end{cases}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\begin{cases}x-3y=15\\\\4x+y=1\\end{cases}$<\/span>"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$\\begin{cases}x-3y=15\\\\4x+y=1\\end{cases}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-01 03:33:49","option_type":"math","len":0},{"id":"7054","post_id":"7750","mon_id":"1159278","chapter_id":"1159281","question":"<p>Nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng trình <span class=\"math-tex\">$\\begin{cases}3x+4y=8\\\\x-2y=-4\\end{cases}$<\/span> là <\/p>","options":["<strong>A.<\/strong> (1 ; –4)","<strong>B.<\/strong> (–3 ; 2)","<strong>C.<\/strong> (1 ; 4)","<strong>D.<\/strong> (0 ; 2)"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> (0 ; 2).<\/span><\/p><p>T\u1eeb ph\u01b0\u01a1ng trình th\u1ee9 hai ta \u0111\u01b0\u1ee3c x = 2y – 4, th\u1ebf vào ph\u01b0\u01a1ng trình th\u1ee9 nh\u1ea5t \u0111\u01b0\u1ee3c <span class=\"math-tex\">$3(2y - 4)+4y=8$<\/span>, suy ra <span class=\"math-tex\">$y=2$<\/span>.<\/p><p>Th\u1ebf y = 2 vào x = 2y – 4 \u0111\u01b0\u1ee3c x = 0.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-01 03:39:00","option_type":"txt","len":2},{"id":"7055","post_id":"7750","mon_id":"1159278","chapter_id":"1159281","question":"<p>Trong các ph\u01b0\u01a1ng trình sau, ph\u01b0\u01a1ng trình nào là ph\u01b0\u01a1ng trình b\u1eadc nh\u1ea5t hai \u1ea9n x, y?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$ax+by=c$<\/span>, a, b, c ∈ R.","<strong>B.<\/strong> <span class=\"math-tex\">$ax+by=c$<\/span>, a, b, c ∈ R, c <span class=\"math-tex\">$\\ne$<\/span> 0.","<strong>C.<\/strong> <span class=\"math-tex\">$ax+by=c$<\/span>, a, b, c ∈ R, a <span class=\"math-tex\">$\\ne$<\/span> 0 ho\u1eb7c b <span class=\"math-tex\">$\\ne$<\/span> 0.","<strong>D.<\/strong> <strong>A, B, C<\/strong> \u0111\u1ec1u \u0111úng."],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$ax+by=c$<\/span>, a, b, c ∈ R, a <span class=\"math-tex\">$\\ne$<\/span> 0 ho\u1eb7c b <span class=\"math-tex\">$\\ne$<\/span> 0.<\/span><\/p><p>Ph\u01b0\u01a1ng trình ax + by = c (a, b, c ∈ R, a <span class=\"math-tex\">$\\ne$<\/span> 0 ho\u1eb7c b <span class=\"math-tex\">$\\ne$<\/span> 0) là ph\u01b0\u01a1ng trình b\u1eadc nh\u1ea5t hai \u1ea9n<br \/>x, y.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-01 03:42:20","option_type":"math","len":0}]}
