{"common":{"save":0,"post_id":"6451","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6671","mon_id":"1158767","chapter_id":"1158885","post_id":"6451","question":"<p>Cho giá tr\u1ecb g\u1ea7n \u0111úng c\u1ee7a <span class=\"math-tex\">$\\dfrac{8}{17}$<\/span> là 0,47. S\u1ed1 g\u1ea7n \u0111úng nh\u1eadn \u0111\u01b0\u1ee3c có \u0111\u1ed9 chính xác là bao nhiêu?<\/p>","options":["<strong>A. <\/strong>0,001","<strong>B.<\/strong> 0,0001","<strong>C.<\/strong> 0,002","<strong>D.<\/strong> 0,0002"],"correct":"1","level":"2","hint":"","answer":"<p>Ta có: <span class=\"math-tex\">$\\dfrac{8}{17}=0,4705882353...$<\/span><\/p><p><span class=\"math-tex\">$\\bigg|0,47-\\dfrac{8}{17}\\bigg|<|0,47-0,470588|<0,00059\\le0,001$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A. <\/strong>0,001<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-05-28 03:59:07","option_type":"txt","len":0},{"id":"6672","mon_id":"1158767","chapter_id":"1158885","post_id":"6451","question":"<p>Tìm s\u1ed1 g\u1ea7n \u0111úng c\u1ee7a a = 2 851 275 v\u1edbi \u0111\u1ed9 chính xác d = 300.<\/p>","options":["<strong>A. <\/strong>2 851 000","<strong>B.<\/strong> 2 851 575","<strong>C.<\/strong> 2 850 025","<strong>D.<\/strong> 2 851 200"],"correct":"1","level":"2","hint":"","answer":"<p>Vì \u0111\u1ed9 chính xác \u0111\u1ebfn <strong>hàng tr\u0103m<\/strong> nên ta quy tròn a \u0111\u1ebfn <strong>hàng nghìn<\/strong>, v\u1eady s\u1ed1 quy tròn c\u1ee7a a là <strong>2 851 000<\/strong>.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A. <\/strong>2 851 000<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-05-28 04:01:57","option_type":"txt","len":1},{"id":"6673","mon_id":"1158767","chapter_id":"1158885","post_id":"6451","question":"<p>Tìm s\u1ed1 g\u1ea7n \u0111úng c\u1ee7a a = 5,2463 v\u1edbi \u0111\u1ed9 chính xác d = 0,001.<\/p>","options":["<strong>A. <\/strong>5,24","<strong>B.<\/strong> 5,25","<strong>C.<\/strong> 5,246","<strong>D.<\/strong> 5,2"],"correct":"2","level":"2","hint":"","answer":"<p>Vì \u0111\u1ed9 chính xác \u0111\u1ebfn <strong>hàng ph\u1ea7n nghìn<\/strong> nên ta quy tròn a \u0111\u1ebfn <strong>hàng ph\u1ea7n tr\u0103m<\/strong>, v\u1eady s\u1ed1 quy tròn c\u1ee7a a là 5,25.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 5,25<\/span><\/p>","type":"choose","extra_type":"shape1","user_id":"131","test":"0","date":"2023-05-28 04:04:38","option_type":"txt","len":0}]}
