{"common":{"save":0,"post_id":"4767","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7881","post_id":"4767","mon_id":"1158113","chapter_id":"1158119","question":"<p>T&igrave;m s\u1ed1 nguy&ecirc;n x th\u1ecfa m&atilde;n<\/p><p><span class=\"math-tex\">$\\dfrac{-1}{4}&lt;\\dfrac{x}{40}&lt;\\dfrac{-1}{5}$<\/span><\/p><p>\u0110&aacute;p s\u1ed1&nbsp; &nbsp;x =&nbsp;&lt;input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/&gt;&lt;\/p>","options":"","correct":["[\"-9\"]"],"level":"3","hint":"<p>T&igrave;m m\u1eabu s\u1ed1 chung c\u1ee7a c&aacute;c ph&acirc;n s\u1ed1 tr&ecirc;n \u0111\u1ec3 quy \u0111\u1ed3ng m\u1eabu s\u1ed1, r\u1ed3i so s&aacute;nh.<\/p>","answer":"<p>MC l&agrave; 40<\/p><p><span class=\"math-tex\">$\\dfrac{-1}{4}=\\dfrac{-10}{40}$<\/span>&nbsp;;&nbsp;<span class=\"math-tex\">$\\dfrac{-1}{5}=\\dfrac{-8}{40}$<\/span><\/p><p>So s&aacute;nh&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-10}{40}&lt; \\dfrac{x}{40}&lt;\\dfrac{-8}{40}$<\/span><\/p><p>X&eacute;t t\u1eed c&oacute;&nbsp;-10 &lt; x &lt; -8&nbsp; m&agrave; x l&agrave; s\u1ed1 nguy&ecirc;n&nbsp;n&ecirc;n x = -9.<\/p><p>\u0110&aacute;p &aacute;n c\u1ea7n \u0111i\u1ec1n l&agrave; <strong><span style=\"color:#16a085;\">-<\/span><span style=\"color:#16a085;\">9<\/span><\/strong>.<\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2021-09-30 13:27:14"},{"id":"7917","post_id":"4767","mon_id":"1158113","chapter_id":"1158119","question":"<p>So s&aacute;nh hai ph&acirc;n s\u1ed1 sau (\u0111i\u1ec1n d\u1ea5u <strong>&gt; , &lt; , =<\/strong> )<\/p><p><span class=\"math-tex\">$\\dfrac{-2^3.3^5}{-8^2.3^4.2019}$<\/span>&nbsp;&lt;input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/&gt;&nbsp;<span class=\"math-tex\">$\\dfrac{-2^5.3^4}{2021.9^4.5^2}$<\/span><\/p>","options":"","correct":["[\">\"]"],"level":"3","hint":"<p>So s&aacute;nh hai ph&acirc;n s\u1ed1 v\u1edbi s\u1ed1 0.<\/p>","answer":"<p>Ta c&oacute;:&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-2^3.3^5}{-8^2.3^4.2019}$<\/span>&nbsp;&gt; 0&nbsp; &nbsp;(t\u1eed&nbsp;v&agrave; m\u1eabu c&ugrave;ng d\u1ea5u )<\/p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-2^5.3^4}{2021.9^4.5^2}$<\/span>&nbsp; &lt; 0&nbsp; &nbsp;(t\u1eed v&agrave; m\u1eabu tr&aacute;i d\u1ea5u)<\/p><p>Do \u0111&oacute;&nbsp; &nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-2^3.3^5}{-8^2.3^4.2019}$<\/span>&nbsp; <strong><span style=\"color:#16a085;\">&gt;&nbsp;&nbsp;<\/span><\/strong><span class=\"math-tex\">$\\dfrac{-2^5.3^4}{2021.9^4.5^2}$<\/span><\/p><p>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l&agrave;&nbsp; <strong><span style=\"color:#16a085;\">&gt;<\/span><\/strong><\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2021-10-01 05:45:59"},{"id":"7920","post_id":"4767","mon_id":"1158113","chapter_id":"1158119","question":"<p>C&oacute; bao nhi&ecirc;u s\u1ed1 nguy&ecirc;n x th\u1ecfa m&atilde;n<\/p><p><span class=\"math-tex\">$\u200b\u200b\\dfrac{-1}{9}<\\dfrac{x}{18}<\\dfrac{1}{2}$<\/span>&nbsp;?<\/p>","options":["9","10","11","12"],"correct":"2","level":"3","hint":"<p>Quy \u0111\u1ed3ng m\u1eabu c&aacute;c ph&acirc;n s\u1ed1 \u0111\u1ec3 t&igrave;m x.<\/p>","answer":"<p>Ta c&oacute;:&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-1}{9}=\\dfrac{-2}{18}$<\/span>&nbsp; ;&nbsp; &nbsp;<span class=\"math-tex\">$\\dfrac{1}{2}=\\dfrac{9}{18}$<\/span><\/p><p>Theo \u0111\u1ec1 b&agrave;i ta c&oacute;:&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-2}{18}< \\dfrac{x}{18}<\\dfrac{9}{18}$<\/span><\/p><p>Suy ra&nbsp; &nbsp;-2 &lt; x &lt; 9&nbsp; m&agrave; x l&agrave; s\u1ed1 nguy&ecirc;n n&ecirc;n&nbsp; x&nbsp;&isin; {-1 ; 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8}<\/p><p>Do \u0111&oacute; c&oacute; <span style=\"color:#16a085;\">10 s\u1ed1 nguy&ecirc;n<\/span> th\u1ecfa m&atilde;n y&ecirc;u c\u1ea7u.<\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp; <strong><span style=\"color:#16a085;\">10<\/span><\/strong><\/p>","type":"choose","extra_type":"star","time":"0","user_id":"131","test":"1","date":"2021-10-01 05:52:29","option_type":"txt","len":0}]}