{"common":{"save":0,"post_id":"5654","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6896","post_id":"5654","mon_id":"1158532","chapter_id":"1158543","question":"<p>So sánh hai s\u1ed1 th\u1ef1c <span class=\"math-tex\">$\\sqrt{34}$<\/span> và <span class=\"math-tex\">$-\\sqrt{34}$<\/span>.<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/con-vat\/co1.png\" \/><\/div>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\sqrt{34}$<\/span> < <span class=\"math-tex\">$-\\sqrt{34}$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$\\sqrt{34}$<\/span> = <span class=\"math-tex\">$-\\sqrt{34}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\sqrt{34}$<\/span> > <span class=\"math-tex\">$-\\sqrt{34}$<\/span>","<strong>D. <\/strong>Không so sánh \u0111\u01b0\u1ee3c"],"correct":"3","level":"2","hint":"<p>Ta có: <span class=\"math-tex\">$\\sqrt{34}$<\/span> > 0 và <span class=\"math-tex\">$-\\sqrt{34}$<\/span> < 0<\/p>","answer":"<p>Ta có: <span class=\"math-tex\">$\\sqrt{34}$<\/span> > 0 và <span class=\"math-tex\">$-\\sqrt{34}$<\/span> < 0 <\/p><p>Suy ra <span class=\"math-tex\">$\\sqrt{34}$<\/span> > <span class=\"math-tex\">$-\\sqrt{34}$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>C. <\/strong><span class=\"math-tex\">$\\sqrt{34}$<\/span> > <span class=\"math-tex\">$-\\sqrt{34}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-03 10:30:25","option_type":"math","len":0},{"id":"6898","post_id":"5654","mon_id":"1158532","chapter_id":"1158543","question":"<p>Dân s\u1ed1 hi\u1ec7n t\u1ea1i c\u1ee7a Vi\u1ec7t Nam là 98 764 680 ng\u01b0\u1eddi vào ngày 04\/04\/2022 theo s\u1ed1 li\u1ec7u m\u1edbi nh\u1ea5t t\u1eeb Liên H\u1ee3p Qu\u1ed1c. (Ngu\u1ed3n: https:\/\/danso.org\/viet-nam\/). Hãy làm tròn s\u1ed1 trên v\u1edbi \u0111\u1ed9 chính xác 500.<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/con-vat\/con-de-2.png\" \/><\/div>","options":["<strong>A.<\/strong> 98 764 000","<strong>B.<\/strong> 98 765 000","<strong>C.<\/strong> 98 744 000","<strong>D.<\/strong> 98 746 000"],"correct":"2","level":"2","hint":"<p>\u0110\u1ec3 làm tròn s\u1ed1 th\u1eadp phân d\u01b0\u01a1ng t\u1edbi m\u1ed9t hàng nào \u0111ó (g\u1ecdi là hàng làm tròn), ta làm nh\u01b0 sau:<\/p><p>- \u0110\u1ed1i v\u1edbi ch\u1eef s\u1ed1 hàng làm tròn:<\/p><p> + Gi\u1eef nguyên n\u1ebfu ch\u1eef s\u1ed1 sau hàng làm tròn nh\u1ecf h\u01a1n 5;<\/p><p> + T\u0103ng 1 \u0111\u01a1n v\u1ecb n\u1ebfu ch\u1eef s\u1ed1 sau hàng làm tròn l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5<\/p><p>- \u0110\u1ed1i v\u1edbi ch\u1eef s\u1ed1 sau hàng làm tròn:<\/p><p> + B\u1ecf \u0111i n\u1ebfu \u1edf ph\u1ea7n th\u1eadp phân;<\/p><p> + Thay b\u1eb1ng các ch\u1eef s\u1ed1 0 n\u1ebfu \u1edf ph\u1ea7n s\u1ed1 nguyên<\/p>","answer":"<p>\u0110\u1ec3 k\u1ebft qu\u1ea3 làm tròn có \u0111\u1ed9 chính xác 500 thì hàng làm tròn là hàng nghìn.<\/p><p>Áp d\u1ee5ng quy t\u1eafc làm tròn ta \u0111\u01b0\u1ee3c:<\/p><p>98 76<span style=\"color:#e74c3c;\">4 6<\/span>80 ≈ 98 765 000 (vì ch\u1eef s\u1ed1 sau hàng làm tròn là 6 > 5)<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B. <\/strong>98 <\/span><span style=\"color:#16a085;\">765 000<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-04 07:54:41","option_type":"txt","len":1},{"id":"6900","post_id":"5654","mon_id":"1158532","chapter_id":"1158543","question":"<p>Tính <span class=\"math-tex\">$\\sqrt{12^2}$<\/span>.<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/con-vat\/dan-vit1.png\" \/><\/div>","options":["<span class=\"math-tex\">$12^2$<\/span>","144","12","<span class=\"math-tex\">$\\sqrt{12}$<\/span>"],"correct":"3","level":"2","hint":"<p>V\u1edbi a > 0 thì <span class=\"math-tex\">$\\sqrt{a^2}=a$<\/span><\/p>","answer":"<p><span class=\"math-tex\">$\\sqrt{12^2}$<\/span> = <span class=\"math-tex\">$\\sqrt{144}$<\/span> = 12 <\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\">12.<\/span><\/p>","type":"choose","extra_type":"star","time":"0","user_id":"131","test":"1","date":"2022-04-04 07:58:51","option_type":"math","len":0}]}