Question

Bài 1-7 ạ! CẢM ƠN

Answer 1

6:

a: =5/5*7=7

b: =7/9(3/4+1/4)

=7/9

c: =(1+5+3*3)/63=15/63=5/21

8:

a: =>5x=5/8

=>x=1/8

b: =>x=18/23:6/7=18/23*7/6=126/138=21/23

c: =>x=5/2*5/6=25/12