Question

Efetue a)18/15-4/12
B)7/5+3/8+5/20
C) 4/3×5/7
D)6/8:4/7

Answer 1

a) 18/15-4/12=
72/60-20/60=52/60=26/30=13/15

b) 7/5+3/8+5/20=
56/40+15/40+10/40= 81/40

c) 4/3 x 5/7= 20/21

d) 6/8 : 4/7 = 6/8 x 7/4 = 42/32= 21/16

Answer 2

Olá, boa noite ☺

Resoluções:

a)

18/15-4/12

m.m.c(12,15)=60.

(72 -20 )/60=52/60 :4/4=13/15

b)

7/5+3/8+5/20

m.m.c(5,8,20)=40.

(56 + 15 + 10)/40=81/40 

c)

4/3 × 5/7 = 20/21.

d)

6/8:4/7 = 6/8 × 7/4 = 42/32 : 2/2= 21/16.

Bons estudos :)