{"common":{"save":0,"post_id":"4630","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7077","post_id":"4630","mon_id":"1158113","chapter_id":"1158126","question":"<p>B\u01a1 là m\u1ed9t lo\u1ea1i qu\u1ea3 giàu ch\u1ea5t dinh d\u01b0\u1ee1ng và r\u1ea5t t\u1ed1t cho s\u1ee9c kh\u1ecfe. Bi\u1ebft r\u1eb1ng c\u1ee9 68 g b\u01a1 cung c\u1ea5p kho\u1ea3ng 4,5 g ch\u1ea5t x\u01a1. H\u1ecfi n\u1ebfu m\u1ed9t qu\u1ea3 b\u01a1 n\u1eb7ng 1,4 kg thì cung c\u1ea5p m\u1ed9t l\u01b0\u1ee3ng ch\u1ea5t x\u01a1 kho\u1ea3ng bao nhiêu? (S\u1eed d\u1ee5ng máy tính c\u1ea7m tay \u0111\u1ec3 tính và làm tròn k\u1ebft qu\u1ea3 \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp phân th\u1ee9 hai).<\/p>","options":["0,09 kg","0,9 kg","0,009 kg"],"correct":"1","level":"2","hint":"<p>Tính t\u1ec9 l\u1ec7 ph\u1ea7n tr\u0103m ch\u1ea5t x\u01a1 có trong b\u01a1 (làm tròn \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp phân th\u1ee9 hai).<\/p><p>Tính l\u01b0\u1ee3ng ch\u1ea5t x\u01a1 có trong 1,4 kg b\u01a1 b\u1eb1ng cách \u0111\u01b0a v\u1ec1 bài toán tìm <strong>m%<\/strong> c\u1ee7a m\u1ed9t s\u1ed1 <strong>a <\/strong>(làm tròn k\u1ebft qu\u1ea3 \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp phân th\u1ee9 hai).<\/p><p>Chú ý \u0111\u01a1n v\u1ecb \u0111o.<\/p>","answer":"<p>T\u1ec9 l\u1ec7 ph\u1ea7n tr\u0103m ch\u1ea5t x\u01a1 có trong b\u01a1: <span class=\"math-tex\">$\\dfrac{4,5}{68}.100$<\/span>% <span class=\"math-tex\">$\\approx$<\/span> 6,62%<\/p><p>Do \u0111ó, trong 1,4 kg b\u01a1 có l\u01b0\u1ee3ng ch\u1ea5t x\u01a1 kho\u1ea3ng: 1,4 . <span class=\"math-tex\">$\\dfrac{6,62}{100}$<\/span> <span class=\"math-tex\">$\\approx$<\/span> <strong>0,09 (kg)<\/strong> <\/p><p>V\u1eady 1,4 kg b\u01a1 cho kho\u1ea3ng <strong>0,09 kg ch\u1ea5t x\u01a1<\/strong>.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>0,09 kg<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-09-02 13:17:53","option_type":"txt","len":0},{"id":"7079","post_id":"4630","mon_id":"1158113","chapter_id":"1158126","question":"<p>Bi\u1ebft m\u1ed9t b\u1ea3n \u0111\u1ed3 \u0111\u01b0\u1eddng b\u1ed9 có t\u1ec9 l\u1ec7 xích là <span class=\"frac123\"><span class=\"ts\">1<\/span><span class=\"ms\">50 000<\/span><\/span> . M\u1ed9t h\u1ecdc sinh \u0111o \u0111\u01b0\u1ee3c kho\u1ea3ng cách gi\u1eefa hai \u0111i\u1ec3m là 11,4 cm. H\u1ecfi trên th\u1ef1c t\u1ebf kho\u1ea3ng cách gi\u1eefa hai \u0111i\u1ec3m \u0111ó là bao nhiêu km?<\/p>","options":["5,7 km","57 km","7,5 km","75 m"],"correct":"1","level":"2","hint":"<p>Kho\u1ea3ng cách th\u1ef1c t\u1ebf = kho\u1ea3ng cách trên b\u1ea3n \u0111\u1ed3 : t\u1ec9 l\u1ec7 xích<\/p><p>Chú ý: 1 km = 100 000 cm<\/p>","answer":"<p>Kho\u1ea3ng cách gi\u1eefa hai \u0111i\u1ec3m \u0111ó trên th\u1ef1c t\u1ebf là: 11,4 : <span class=\"math-tex\">$\\dfrac{1}{50 000}$<\/span> = 11,4 . 50 000 = 570 000 (cm)<\/p><p>\u0110\u1ed5i 570 000 cm = <span style=\"color:#16a085;\"><strong>5,7 km<\/strong><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>5,7 km<\/strong><\/span><\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"131","test":"1","date":"2021-09-02 13:25:52","option_type":"txt","len":0},{"id":"7081","post_id":"4630","mon_id":"1158113","chapter_id":"1158126","question":"<p>Tính b\u1eb1ng cách h\u1ee3p lí<\/p><p>A = (-0,7 : 0,007 + 90) . (2,3 . 30 + 23 . 17)<\/p><p>A = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/><\/p>","options":"","correct":["[\"-4600\"]"],"level":"2","hint":"<p>Chú ý th\u1ef1 t\u1ef1 th\u1ef1c hi\u1ec7n phép tính: trong ngo\u1eb7c \u0111\u1ebfn nhân chia \u0111\u1ebfn c\u1ed9ng tr\u1eeb.<\/p>","answer":"<p>A = (-0,7 : 0,007 + 90) . (2,3 . 30 + 23 . 17)<\/p><p>A = (-700 : 7 + 90 ) . (2,3 . 10 . 3 + 23 . 17)<\/p><p>A = (-100 + 90) . (23 . 3 + 23 . 17)<\/p><p>A = (-10) . [23 ( 3 + 17 ) ]<\/p><p>A = (-10) . 23 . 20<\/p><p>A = <strong><span style=\"color:#16a085;\">-4600<\/span><\/strong><\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <span style=\"color:#16a085;\"><strong> -4600<\/strong><\/span><\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"3","date":"2021-09-02 13:40:28"}]}