ta có hỗn số1 3/7 của 21/25 là: kq phép tính: 8.19+19+2.19/14.44+5.44 là: tổng của 1/1.6 +1/6.11+ 1/11.16 +...+ 1/496.501 là a)7/9+5/12-3/4 b) 1,4.15/49-(4/5+2/3):11/5 c)6/7+5/7:5-8/9 d) (7/8-3/4).4/3-7/2:21/4 e) (-3,2) .-15/64+ (0,8 - 34/15) :11/3 f) 28.0,75-(11/20+25%):7/5 GIÚP EM VỚI EM CẦN GẤP LẮM AH

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