{"common":{"save":0,"post_id":"5724","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6948","post_id":"5724","mon_id":"1158532","chapter_id":"1158543","question":"<p>V\u1edbi m\u1ecdi s\u1ed1 th\u1ef1c x ta c&oacute;:<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/do-vat\/ong-nghiem.png\" \/><\/div>","options":["<strong>A. <\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0\\ge 0$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0\\ge x$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0= |-x|$<\/span>","<strong>D. <\/strong>C\u1ea3 A, B, C \u0111\u1ec1u \u0111&uacute;ng"],"correct":"4","level":"2","hint":"<p>D\u1ef1a v&agrave;o \u0111\u1ecbnh ngh\u0129a gi&aacute; tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 th\u1ef1c:<\/p><p>&quot;Kho\u1ea3ng c&aacute;ch t\u1eeb \u0111i\u1ec3m a tr&ecirc;n tr\u1ee5c s\u1ed1 \u0111\u1ebfn g\u1ed1c O l&agrave; gi&aacute; tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 a.&quot;<\/p>","answer":"<p>D\u1ef1a v&agrave;o \u0111\u1ecbnh ngh\u0129a gi&aacute; tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 th\u1ef1c:<\/p><p>&quot;Kho\u1ea3ng c&aacute;ch t\u1eeb \u0111i\u1ec3m a tr&ecirc;n tr\u1ee5c s\u1ed1 \u0111\u1ebfn g\u1ed1c O l&agrave; gi&aacute; tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 a.&quot;<\/p><p>Do \u0111&oacute; v\u1edbi m\u1ecdi s\u1ed1 th\u1ef1c x ta c&oacute;:<\/p><p><strong>A.&nbsp;<\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0\\ge 0$<\/span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u0110&uacute;ng&nbsp;<\/p><p><strong>B.&nbsp;<\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0\\ge x$<\/span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;\u0110&uacute;ng<\/p><p><strong>C.&nbsp;<\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0= |-x|$<\/span>&nbsp; &nbsp; &nbsp;\u0110&uacute;ng<\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;&nbsp;<span style=\"color:#16a085;\"><strong>D.&nbsp;<\/strong>C\u1ea3 A, B, C \u0111\u1ec1u \u0111&uacute;ng<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-06 09:01:22","option_type":"math","len":0},{"id":"6952","post_id":"5724","mon_id":"1158532","chapter_id":"1158543","question":"<p>Cho hai s\u1ed1 th\u1ef1c x = -3,142 v&agrave; y = -4,12.&nbsp;Ph&eacute;p so s&aacute;nh n&agrave;o d\u01b0\u1edbi \u0111&acirc;y l&agrave; \u0111&uacute;ng?<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/do-vat\/cuc-tay.png\" \/><\/div>","options":["<strong>A.<\/strong> x &lt; y","<strong>B.<\/strong> |x| &lt; |y|","<strong>C.<\/strong> |x| &gt; |y|","<strong>D.<\/strong> x &gt; y"],"correct":"[\"2\",\"4\"]","level":"2","hint":"<p>So s&aacute;nh x v&agrave; y;<\/p><p>So s&aacute;nh |x| v&agrave; |y|.<\/p>","answer":"<p>Ta c&oacute;: |x| = 3,142 ; |y| = 4,12<\/p><p><strong>A.<\/strong>&nbsp;x &lt;&nbsp;y&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Sai v&igrave; -3,142 &gt; -4,12 n&ecirc;n x &gt; y<\/p><p><strong>B.<\/strong>&nbsp;|x| &lt; |y|&nbsp; &nbsp; &nbsp; \u0110&uacute;ng<\/p><p><strong>C.<\/strong>&nbsp;|x| &gt;&nbsp;|y|&nbsp; &nbsp; &nbsp; Sai v&igrave; 3,142 &lt;&nbsp;4,12 n&ecirc;n |x| &lt;&nbsp;|y|<\/p><p><strong>D.<\/strong>&nbsp;x &gt;&nbsp;y&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u0110&uacute;ng<\/p><p>C&aacute;c \u0111&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;|x| &lt; |y|&nbsp;<\/span> &nbsp;v&agrave;&nbsp;&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;x &gt;&nbsp;y<\/span><\/p>","type":"checkbox","extra_type":"classic-checkbox","time":"0","user_id":"131","test":"1","date":"2022-04-06 09:19:47","option_type":"txt","len":1},{"id":"6959","post_id":"5724","mon_id":"1158532","chapter_id":"1158543","question":"<p>Ch\u1ecdn c&acirc;u sai.<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/do-vat\/dong-ho-cat.png\" \/><\/div>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\sqrt{30}\\in\\mathbb{R}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{9}\\in\\mathbb{R}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$-\\sqrt{30}\\notin\\mathbb{R}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$-2,1(3)\\in\\mathbb{R}$<\/span>"],"correct":"3","level":"2","hint":"","answer":"<p><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\sqrt{30}\\in\\mathbb{R}$<\/span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;\u0110&uacute;ng<\/p><p><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{1}{9}\\in\\mathbb{R}$<\/span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;\u0110&uacute;ng<\/p><p><strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$-\\sqrt{30}\\notin\\mathbb{R}$<\/span>&nbsp; &nbsp; &nbsp; Sai v&igrave;&nbsp;<span class=\"math-tex\">$-\\sqrt{30}\\in\\mathbb{R}$<\/span><\/p><p><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$-2,1(3)\\in\\mathbb{R}$<\/span>&nbsp; &nbsp;\u0110&uacute;ng<\/p><p>\u0110&aacute;p &aacute;n l&agrave;&nbsp; <span style=\"color:#16a085;\">&nbsp;<strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$-\\sqrt{30}\\notin\\mathbb{R}$<\/span>&nbsp;<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-08 08:32:34","option_type":"math","len":0}]}