Question

4) EFETUE

a) 2/5+7/6=

b)-4/5+7/2-5/4=

c) 1/4+2/3-4/7=

d) 2/7:(-4/5)+2/5=

Answer 1

a)1,56
b)1,45
c)0,32
d)6,3

Answer 2

a) 2/5+7/6
MMC (5,6): 30
Então debaixo você divide e de cima vc multiplica:

12+35/30 = 47/30

b) -4/5+7/2-5/4
MMC (2,4,5)= 20
-16+70-25/20= -41+70/20= 29/20

c) 1/4+2/3-4/7
MMC (3,4,7)= 84
21+56-48/84= 29/84

d) 2/7:(-4/5)+2/5
Primeiro a divisão
2/7:(-4/5)= -10/28

-10/28+2/5= -50+56/140= 6/140= 3/70