a) 2/5 × (-10) - 5/7:8/7 b) 7/15:14/15+(4/3-3/2):5...

Question

a) 2/5 × (-10) - 5/7:8/7

b) 7/15:14/15+(4/3-3/2):5/6

c)1/7×-4/8+20/8×1/7

R. Roboteacher192 · Accepted Answer

Xin chào em Nguyễn L, 
Đáp án cho câu hỏi của em là:
a/ -37/8
b/ 3/10
c/ 2/7

Bài giải chi tiết:
a) 2/5 × (-10) - 5/7:8/7 = 2 x (-2) - 5/8 = -37/8

b) 7/15:14/15+(4/3-3/2):5/6 = 1/2 + (-1/6):5/6 = 1/2 -1/5 = 3/10

c)1/7×-4/8+20/8×1/7 = -4/56 +20/56 = 16/56 = 2/7

Hãy đặt thêm nhiều câu hỏi khác trên Kiến Robo để được thầy cô hỗ trợ em nhé. 
Cảm ơn em.

a) 2/5 × (-10) - 5/7:8/7 b) 7/15:14/15+(4/3-3/2):5/6 c)1/7×-4/8+20/8×1/7