Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"6532","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5723","post_id":"6532","mon_id":"1158921","chapter_id":"1158927","question":"<p>Cho hai \u0111a th\u1ee9c <span class=\"math-tex\">$A=-x^2y+3xy^2-3$<\/span> và <span class=\"math-tex\">$B=2x^2y-5xy^2+6$<\/span>. Tính t\u1ed5ng A + B.<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$x^2y-2xy^2+3$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$2x^2y-2xy^2-3$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$-x^2y+2xy^2-3$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$x^2y-4xy^2-3$<\/span>"],"correct":"1","level":"1","hint":"","answer":"<p> <span class=\"math-tex\">$A=-x^2y+3xy^2-3$<\/span><\/p><p> <span class=\"math-tex\">$B=2x^2y-5xy^2+6$<\/span><\/p><p><span class=\"math-tex\">$A+B=-x^2y+2x^2y+3xy^2-5xy^2-3+6$<\/span><\/p><p> <span class=\"math-tex\">$=x^2y-2x^2y+3$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A. <\/strong><span class=\"math-tex\">$x^2y-2xy^2+3$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-02 01:17:07","option_type":"math","len":0},{"id":"5725","post_id":"6532","mon_id":"1158921","chapter_id":"1158927","question":"<p>Cho hai \u0111a th\u1ee9c <span class=\"math-tex\">$A=-x^2y+3xy^2-3$<\/span> và <span class=\"math-tex\">$B=2x^2y-5xy^2+6$<\/span>.<\/p><p>Tính hi\u1ec7u B – A.<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$-3x^2y+8xy^2-9$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$3x^2y+8xy^2+9$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$-x^2y-2xy^2+3$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$3x^2y-8xy^2+9$<\/span>"],"correct":"4","level":"1","hint":"","answer":"<p> <span class=\"math-tex\">$B=2x^2y-5xy^2+6$<\/span> <\/p><p> <span class=\"math-tex\">$A=-x^2y+3xy^2-3$<\/span> <\/p><p><span class=\"math-tex\">$B-A=2x^2y-(-x^2y)-5xy^2-3xy^2+6-(-3)$<\/span><\/p><p> <span class=\"math-tex\">$=3x^2y-8xy^2+9$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D. <\/strong><span class=\"math-tex\">$3x^2y-8xy^2+9$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-02 01:23:24","option_type":"math","len":0},{"id":"5729","post_id":"6532","mon_id":"1158921","chapter_id":"1158927","question":"<p>Cho ba \u0111a th\u1ee9c <span class=\"math-tex\">$A=x^5-x^2y+3xy^2-y^2$<\/span>, <span class=\"math-tex\">$B= -2x^5+6xy^2+y^2$<\/span> và <span class=\"math-tex\">$C=3x^2y-xy^2$<\/span>. Tìm \u0111a th\u1ee9c M = A + B – C<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$M=-2x^5+4x^2y+10xy^2$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$M=x^5-4x^2y-10xy^2$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$M=-x^5-4x^2y+10xy^2$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$M=x^5+4x^2y+10xy^2$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p> <span class=\"math-tex\">$A=\\space\\space\\space\\space x^5-x^2y+3xy^2-y^2$<\/span><\/p><p> <span class=\"math-tex\">$B= -2x^5\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space+6xy^2+y^2$<\/span><\/p><p> <span class=\"math-tex\">$C=\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space3x^2y-xy^2$<\/span><\/p><p><span class=\"math-tex\">$A+B-C=$<\/span><span class=\"math-tex\">$x^5-2x^5-x^2y-3x^2y+3xy^2+6xy^2-(-xy^2)-y^2+y^2$<\/span><\/p><p> <span class=\"math-tex\">$M=-x^5-4x^2y+10xy^2$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C. <\/strong><span class=\"math-tex\">$M=-x^5-4x^2y+10xy^2$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-02 01:36:28","option_type":"math","len":0}]}