Question

Giải đầy đủ giúp mik với

Answer 1

1:

a: 4/5*2/7=8/35

b: 3/4*8/9=24/36=2/3

c: 5/8*3=15/8

d: 5*6/21=5*2/7=10/7

e: 3/5*4/5*6/7=12/25*6/7=72/175

2:

a: =8/15*1/4=2/15

b: =2/5(3/7+4/7)=2/5