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chiataybanbe2015
2 năm trước
Giúp mik bài 1 tính a) 3/14- -5/40- 1/-7 b) -3/4+2/3-41/20 c) -4/3-5/12 +2 d) 1/-2+1/3-1/4+ -1/6 bài 2 điền thích hợp vào ô trống a) 7/9-...../3=1/9 b) 1/....- -2/15 =7/15 c) .../21trừ cho 2/3 =5/51 d) 7/9=8/27=...../27 e) 2/....- âm 3/25=7/50 f) 7/9 trừ 8/21 =..../21
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