Question

Answer 1

1:

a: =2/25-17/25=-15/25=-3/5

b: =-17/28-11/28+5/11+6/11-7/36=-7/36

c: =-3/10+1/3+3/10=1/3

2: 

a: x+13/2=25/8

=>x=25/8-13/2=25/8-52/8=-27/8

b: 6/12=-4/x

=>-4/x=1/2

=>x=-8

c: =>12/10<x/10<15/10

=>x thuộc {13;14}