Question

8) Calcule as adições e subtrações abaixo:
a)-9/7 + 2,5=
b) 16/4 +7/5=
c) -8/10-6/3=
d) 28,05 +32,2=
e) 192-70/4=
f) 1627,42 +202,3 =
g) 32/8-12/6=
h) 32-6,442=​

Answer 1

Resposta:

Explicação passo-a-passo:

a)-9/7 + 2,5=

= - 9/7 + 25/10 (:5/:5)

= - 9/7 + 5/2

= [ 2.(-9) + 7.5]/14

= [ - 18 + 35]/14

= 17/14

---------------------

b) 16/4 +7/5=

= 4 + 7/5

= (5.4+7)/5

= (20+7)/5

= 27/5

______________

c) -8/10 (:2)/(:2) - 6/3

= - 4/5 - 2

= (-4 - 5.2)/5

= (-4 -10)/5

= - 14/5

______________

d) 28,05 +32,2=

28,05

+32,20

-------------

60,25

_____________

e)

192-70/4=

f) 1627,42 +202,3 =

1627,42

+ 202,30

----------------

1829,72

_______________

g) 32/8-12/6=

= 4-2

= 2

______________

h) 32-6,442=​

32,000

- 6,442

----------------

25,558