{"common":{"save":0,"post_id":"5813","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8529","post_id":"5813","mon_id":"1158532","chapter_id":"1158660","question":"<p>Tính <span class=\"math-tex\">$(-0,5x).(2,4x^2-4x-3,6)$<\/span><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$-1,2x^3-2 x^2+1,8x$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$1,2x^3+2 x^2+1,8x$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$-1,2x^3+2 x^2+1,8$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$-1,2x^3+2 x^2+1,8x$<\/span>"],"correct":"4","level":"2","hint":"<p>Mu\u1ed1n nhân m\u1ed9t \u0111\u01a1n th\u1ee9c v\u1edbi m\u1ed9t \u0111a th\u1ee9c, ta nhân \u0111\u01a1n th\u1ee9c v\u1edbi t\u1eebng h\u1ea1ng t\u1eed c\u1ee7a \u0111a th\u1ee9c r\u1ed3i c\u1ed9ng các tích v\u1edbi nhau.<\/p>","answer":"<p>Ta có: <span class=\"math-tex\">$(-0,5x).(2,4x^2-4x-3,6)$<\/span><\/p><p> <span class=\"math-tex\">$=(-0,5x).2,4x^2+(-0,5x).(-4x)+(-0,5x).(-3,6)$<\/span><\/p><p> <span class=\"math-tex\">$=(-0,5)\\space.\\space 2,4\\space.x.x^2+0,5\\space.\\space4\\space.\\space x.x+0,5\\space.\\space3\\space,6\\space.\\space x$<\/span><\/p><p> <span class=\"math-tex\">$=-1,2x^3+2 x^2+1,8x$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D. <\/strong><span class=\"math-tex\">$-1,2x^3+2 x^2+1,8x$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 08:27:17","option_type":"math","len":0},{"id":"8532","post_id":"5813","mon_id":"1158532","chapter_id":"1158660","question":"<p>Th\u1ef1c hi\u1ec7n phép nhân hai \u0111a th\u1ee9c:<\/p><p><span class=\"math-tex\">$(-x+1).(x-2)$<\/span><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$-x^2+3x-2$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$-x^2+x-2$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$x^2+3x-2$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$x^2+3x+2$<\/span>"],"correct":"1","level":"2","hint":"<p>Mu\u1ed1n nhân m\u1ed9t \u0111a th\u1ee9c v\u1edbi m\u1ed9t \u0111a th\u1ee9c, ta nhân t\u1eebng h\u1ea1ng t\u1eed c\u1ee7a \u0111a th\u1ee9c này v\u1edbi t\u1eebng h\u1ea1ng t\u1eed c\u1ee7a \u0111a th\u1ee9c kia r\u1ed3i c\u1ed9ng các tích v\u1edbi nhau.<\/p>","answer":"<p>Ta có: <span class=\"math-tex\">$(-x+1).(x-2)$<\/span><\/p><p> <span class=\"math-tex\">$=(-x).x+(-x).(-2)+1.x+1.(-2)$<\/span><\/p><p> <span class=\"math-tex\">$=-x^2+2x+x-2$<\/span><\/p><p> <span class=\"math-tex\">$=-x^2+(2x+x)-2$<\/span><\/p><p> <span class=\"math-tex\">$=-x^2+3x-2$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">$-x^2+3x-2$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 08:41:27","option_type":"math","len":0},{"id":"8534","post_id":"5813","mon_id":"1158532","chapter_id":"1158660","question":"<p>Th\u1ef1c hi\u1ec7n phép nhân hai \u0111a th\u1ee9c:<\/p><p><span class=\"math-tex\">$\\left(\\dfrac{1}{6}x-2\\right ).(-x+1)$<\/span><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{6}x^2+\\dfrac{13}{6}x-2$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$-\\dfrac{1}{6}x^2+\\dfrac{13}{6}x-2$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$-\\dfrac{1}{6}x^2+\\dfrac{1}{6}x-2$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$-\\dfrac{1}{6}x^2-\\dfrac{13}{6}x+2$<\/span>"],"correct":"2","level":"2","hint":"","answer":"<p>Ta có: <span class=\"math-tex\">$\\left(\\dfrac{1}{6}x-2\\right ).(-x+1)$<\/span><\/p><p> <span class=\"math-tex\">$=\\left(\\dfrac{1}{6}x\\right).(-x)+\\left(\\dfrac{1}{6}x\\right).1+(-2).(-x)+(-2).1$<\/span><\/p><p> <span class=\"math-tex\">$=-\\dfrac{1}{6}x^2+\\dfrac{1}{6}x+2x-2$<\/span><\/p><p> <span class=\"math-tex\">$=-\\dfrac{1}{6}x^2+\\dfrac{13}{6}x-2$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B. <\/strong><span class=\"math-tex\">$-\\dfrac{1}{6}x^2+\\dfrac{13}{6}x-2$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 08:58:10","option_type":"math","len":0}]}