{"common":{"save":0,"post_id":"5812","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8509","post_id":"5812","mon_id":"1158532","chapter_id":"1158660","question":"<p>T&iacute;nh&nbsp;<span class=\"math-tex\">$(-x^2).\\left(-\\dfrac{3x}{5}\\right)$<\/span><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{-8}{5}x^3$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$\\dfrac{-3}{5}x^3$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$\\dfrac{3}{5}x$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$\\dfrac{3}{5}x^3$<\/span>"],"correct":"4","level":"1","hint":"<p>Nh&acirc;n hai \u0111\u01a1n th\u1ee9c t&ugrave;y &yacute; b\u1eb1ng c&aacute;ch nh&acirc;n hai h\u1ec7 s\u1ed1 v\u1edbi nhau v&agrave; nh&acirc;n hai l\u0169y th\u1eeba c\u1ee7a bi\u1ebfn v\u1edbi nhau.&nbsp;<\/p>","answer":"<p><span class=\"math-tex\">$(-x^2).\\left(-\\dfrac{3x}{5}\\right)$<\/span><\/p><p><span class=\"math-tex\">$=\\left[(-1).\\left(\\dfrac{-3}{5}\\right)\\right].(x^2.x)$<\/span><\/p><p><span class=\"math-tex\">$=\\dfrac{3}{5}x^3$<\/span><\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;<span style=\"color:#16a085;\"><strong>D.&nbsp;<\/strong><span class=\"math-tex\">$\\dfrac{3}{5}x^3$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 02:25:29","option_type":"math","len":0},{"id":"8510","post_id":"5812","mon_id":"1158532","chapter_id":"1158660","question":"<p>T&iacute;nh&nbsp;<span class=\"math-tex\">$\\left(-\\dfrac{1}{2}x\\right) .10x^3$<\/span><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$5x^4$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$-5x^4$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$-\\dfrac{18}{2}x^4$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$-5x^3$<\/span>"],"correct":"2","level":"1","hint":"<p>Nh&acirc;n hai \u0111\u01a1n th\u1ee9c t&ugrave;y &yacute; b\u1eb1ng c&aacute;ch nh&acirc;n hai h\u1ec7 s\u1ed1 v\u1edbi nhau v&agrave; nh&acirc;n hai l\u0169y th\u1eeba c\u1ee7a bi\u1ebfn v\u1edbi nhau.&nbsp;<\/p>","answer":"<p><span class=\"math-tex\">$\\left(-\\dfrac{1}{2}x\\right) .10x^3$<\/span><\/p><p><span class=\"math-tex\">$=\\left(-\\dfrac{1}{2}.10\\right) .(x.x^3)$<\/span><\/p><p><span class=\"math-tex\">$=-5x^4$<\/span><\/p><p>V\u1eady \u0111&aacute;p &aacute;n \u0111&uacute;ng l&agrave;<span style=\"color:#16a085;\">&nbsp;<strong>B.&nbsp;<\/strong><span class=\"math-tex\">$-5x^4$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 02:51:21","option_type":"math","len":0},{"id":"8511","post_id":"5812","mon_id":"1158532","chapter_id":"1158660","question":"<p>T&iacute;nh&nbsp;<span class=\"math-tex\">$x.(x-1) $<\/span><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x-1$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$x^2-1$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$x^2+1$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$x^2-x$<\/span>"],"correct":"4","level":"1","hint":"<p>Mu\u1ed1n nh&acirc;n m\u1ed9t \u0111\u01a1n th\u1ee9c v\u1edbi m\u1ed9t \u0111a th\u1ee9c, ta nh&acirc;n \u0111\u01a1n th\u1ee9c v\u1edbi t\u1eebng h\u1ea1ng t\u1eed c\u1ee7a \u0111a th\u1ee9c r\u1ed3i c\u1ed9ng c&aacute;c t&iacute;ch v\u1edbi nhau.<\/p>","answer":"<p>Ta c&oacute;:&nbsp;<span class=\"math-tex\">$x.(x-1) $<\/span><\/p><p>&nbsp; &nbsp; &nbsp;&nbsp;<span class=\"math-tex\">$=x.x-x.1$<\/span><\/p><p>&nbsp; &nbsp; &nbsp;&nbsp;<span class=\"math-tex\">$=x^2-x$<\/span><\/p><p>V\u1eady \u0111&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;<span style=\"color:#16a085;\"><strong>D.&nbsp;<\/strong><span class=\"math-tex\">$x^2-x$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-06-01 04:08:04","option_type":"math","len":0}]}