Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"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 có:<\/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 \u0111úng"],"correct":"4","level":"2","hint":"<p>D\u1ef1a vào \u0111\u1ecbnh ngh\u0129a giá tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 th\u1ef1c:<\/p><p>"Kho\u1ea3ng cách t\u1eeb \u0111i\u1ec3m a trên tr\u1ee5c s\u1ed1 \u0111\u1ebfn g\u1ed1c O là giá tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 a."<\/p>","answer":"<p>D\u1ef1a vào \u0111\u1ecbnh ngh\u0129a giá tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 th\u1ef1c:<\/p><p>"Kho\u1ea3ng cách t\u1eeb \u0111i\u1ec3m a trên tr\u1ee5c s\u1ed1 \u0111\u1ebfn g\u1ed1c O là giá tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 a."<\/p><p>Do \u0111ó v\u1edbi m\u1ecdi s\u1ed1 th\u1ef1c x ta có:<\/p><p><strong>A. <\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0\\ge 0$<\/span> \u0110úng <\/p><p><strong>B. <\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0\\ge x$<\/span> \u0110úng<\/p><p><strong>C. <\/strong><span class=\"math-tex\">$|x|\u00a0\u00a0= |-x|$<\/span> \u0110úng<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D. <\/strong>C\u1ea3 A, B, C \u0111\u1ec1u \u0111úng<\/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 và y = -4,12. Phép so sánh nào d\u01b0\u1edbi \u0111ây là \u0111úng?<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/do-vat\/cuc-tay.png\" \/><\/div>","options":["<strong>A.<\/strong> x < y","<strong>B.<\/strong> |x| < |y|","<strong>C.<\/strong> |x| > |y|","<strong>D.<\/strong> x > y"],"correct":"[\"2\",\"4\"]","level":"2","hint":"<p>So sánh x và y;<\/p><p>So sánh |x| và |y|.<\/p>","answer":"<p>Ta có: |x| = 3,142 ; |y| = 4,12<\/p><p><strong>A.<\/strong> x < y Sai vì -3,142 > -4,12 nên x > y<\/p><p><strong>B.<\/strong> |x| < |y| \u0110úng<\/p><p><strong>C.<\/strong> |x| > |y| Sai vì 3,142 < 4,12 nên |x| < |y|<\/p><p><strong>D.<\/strong> x > y \u0110úng<\/p><p>Các \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B.<\/strong> |x| < |y| <\/span> và <span style=\"color:#16a085;\"><strong>D.<\/strong> x > 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 câu 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> <span class=\"math-tex\">$\\sqrt{30}\\in\\mathbb{R}$<\/span> \u0110úng<\/p><p><strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{9}\\in\\mathbb{R}$<\/span> \u0110úng<\/p><p><strong>C.<\/strong> <span class=\"math-tex\">$-\\sqrt{30}\\notin\\mathbb{R}$<\/span> Sai vì <span class=\"math-tex\">$-\\sqrt{30}\\in\\mathbb{R}$<\/span><\/p><p><strong>D.<\/strong> <span class=\"math-tex\">$-2,1(3)\\in\\mathbb{R}$<\/span> \u0110úng<\/p><p>\u0110áp án là <span style=\"color:#16a085;\"> <strong>C.<\/strong> <span class=\"math-tex\">$-\\sqrt{30}\\notin\\mathbb{R}$<\/span> <\/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}]}