Question

2. Elimine os parênteses quando necessário e resolva as operações:
a) ( + 20 ) – ( - 7 )=
b) ( - 25 ) + ( - 45 ) =
c) ( + 12 ) – ( - 9 ) + ( - 10 )=
d) + 15 – ( - 4) + ( - 12 ) =
e) 25 + ( + 5 ) – ( + 6 )=
f) ( - 18 ) – ( - 8 ) + ( + 5 ) =
g) – 8 + 15 =
h) – 18 + ( - 6 ) =
i) + 20 – 35 + ( - 5 ) =
j) + 18 – 3 + 7 =
k) ( -10 ) – 25 + 28 =
l) – 8 + 5 – ( +11 ) =

Answer 1

Resposta:

a) +27

b) - 70

c) + 11

d) + 7

e) 24

f) - 5

g) + 7

h) - 24

i) - 20

j) + 22

k) - 7

l) - 14

Explicação passo-a-passo:

a) ( + 20 ) – ( - 7 )=  +20 + 7 = + 27

b) ( - 25 ) + ( - 45 ) =  - 25 - 45 = -70

c) ( + 12 ) – ( - 9 ) + ( - 10 )=  + 12 + 9 - 10 = + 21 - 10 = + 11

d) + 15 – ( - 4) + ( - 12 ) =  + 15 + 4 - 12 = + 19 - 12 = + 7

e) 25 + ( + 5 ) – ( + 6 )=  25 + 5 - 6 = 30 - 6 = 24

f) ( - 18 ) – ( - 8 ) + ( + 5 ) =  - 18 + 8 + 5 = - 10 + 5 = - 5

g) – 8 + 15 =  + 7

h) – 18 + ( - 6 ) =  - 18 - 6 = - 24

i) + 20 – 35 + ( - 5 ) =  + 20 - 35 - 5 = - 15 - 5 = - 20

j) + 18 – 3 + 7 =  + 15 + 7 = + 22

k) ( -10 ) – 25 + 28 =  - 10 - 25 + 28 = - 35 + 28 = - 7

l) – 8 + 5 – ( +11 ) = - 8 + 5 - 11 = - 3 - 11 = - 14