{"common":{"save":0,"post_id":"5809","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8515","post_id":"5809","mon_id":"1158532","chapter_id":"1158660","question":"<p>Cho hai \u0111a th\u1ee9c M(x) = <span class=\"math-tex\">$x\u00b2 + x - 1$<\/span> và N(x) = <span class=\"math-tex\">$x + 1$<\/span><\/p><p>K\u1ebft qu\u1ea3 c\u1ee7a phép c\u1ed9ng hai \u0111a th\u1ee9c trên là:<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$x^2$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$x\u00b2 + 2x - 2$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$2x\u00b2 - 1$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$x\u00b2 + 2x$<\/span>"],"correct":"4","level":"1","hint":"<p>Khi c\u1ed9ng, tr\u1eeb hai \u0111a th\u1ee9c m\u1ed9t bi\u1ebfn ta nhóm các h\u1ea1ng t\u1eed có cùng b\u1eadc v\u1edbi nhau r\u1ed3i th\u1ef1c hi\u1ec7n các phép c\u1ed9ng tr\u1eeb các \u0111\u01a1n th\u1ee9c cùng b\u1eadc.<\/p>","answer":"<p>M(x) + N(x) = <span class=\"math-tex\">$(x\u00b2 + x - 1) + (x + 1)$<\/span><\/p><p> = <span class=\"math-tex\">$x\u00b2 + x - 1 + x + 1$<\/span><\/p><p> = <span class=\"math-tex\">$x\u00b2 + x + x - 1 + 1$<\/span><\/p><p> = <span class=\"math-tex\">$x\u00b2 + 2x$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D. <\/strong><span class=\"math-tex\">$x\u00b2 + 2x$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2022-06-01 04:09:58","option_type":"math","len":0},{"id":"8516","post_id":"5809","mon_id":"1158532","chapter_id":"1158660","question":"<p>Cho hai \u0111a th\u1ee9c<\/p><p>M(x) = <span class=\"math-tex\">$x\u00b2 + x - 1$<\/span> và N(x) = <span class=\"math-tex\">$x + 1$<\/span><\/p><p>K\u1ebft qu\u1ea3 c\u1ee7a phép tính M(x) - N(x) là<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$x\u00b2 - 2$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x\u00b2 + 2x$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$x\u00b2 - 2x - 2$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$x\u00b2 - 2x + 2$<\/span>"],"correct":"1","level":"1","hint":"<p>Khi c\u1ed9ng, tr\u1eeb hai \u0111a th\u1ee9c m\u1ed9t bi\u1ebfn ta nhóm các h\u1ea1ng t\u1eed có cùng b\u1eadc v\u1edbi nhau r\u1ed3i th\u1ef1c hi\u1ec7n các phép c\u1ed9ng tr\u1eeb các \u0111\u01a1n th\u1ee9c cùng b\u1eadc.<\/p>","answer":"<p>M(x) - Nx) = <span class=\"math-tex\">$(x\u00b2 + x - 1) - (x + 1)$<\/span><\/p><p> = <span class=\"math-tex\">$x\u00b2 + x - 1 - x - 1$<\/span><\/p><p> = <span class=\"math-tex\">$x\u00b2 + x - x - 1 - 1$<\/span><\/p><p> = <span class=\"math-tex\">$x\u00b2 - 2$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>A. <\/strong><span class=\"math-tex\">$x\u00b2 - 2$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2022-06-01 04:14:45","option_type":"math","len":0},{"id":"8517","post_id":"5809","mon_id":"1158532","chapter_id":"1158660","question":"<p>Cho hai \u0111a th\u1ee9c<\/p><p>M(x) = <span class=\"math-tex\">$2x\u00b2 + x - 1$<\/span> và N(x) = <span class=\"math-tex\">$2x\u00b2 + 3$<\/span><\/p><p>K\u1ebft qu\u1ea3 c\u1ee7a phép c\u1ed9ng hai \u0111a th\u1ee9c trên là<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$4x\u00b2 + 2$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$4x\u00b2 + x + 2$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$x\u00b2 - x - 4$<\/span>","<strong>D. <span class=\"math-tex\">$ 4x\u00b2 + x - 4$<\/span><\/strong>"],"correct":"2","level":"1","hint":"<p>Khi c\u1ed9ng, tr\u1eeb hai \u0111a th\u1ee9c m\u1ed9t bi\u1ebfn ta nhóm các h\u1ea1ng t\u1eed có cùng b\u1eadc v\u1edbi nhau r\u1ed3i th\u1ef1c hi\u1ec7n các phép c\u1ed9ng tr\u1eeb các \u0111\u01a1n th\u1ee9c cùng b\u1eadc.<\/p>","answer":"<p>M(x) + N(x) = <span class=\"math-tex\">$(2x\u00b2 + x - 1) + (2x\u00b2 + 3)$<\/span><\/p><p> = <span class=\"math-tex\">$2x\u00b2 + x - 1 + 2x\u00b2 + 3$<\/span><\/p><p> = <span class=\"math-tex\">$2x\u00b2 + 2x\u00b2 + x - 1 + 3$<\/span><\/p><p> = <span class=\"math-tex\">$4x\u00b2 + x + 2$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$4x\u00b2 + x + 2$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 04:21:45","option_type":"math","len":0}]}