Question

12) Calcule as seguintes expressões numéricas

A) 8 - (+4 - 1 ) =
B) -5 ( -2 +3 - 1 ) =
C) 18+ (-1 + 8 +2 ) =
D) 20 - ( +6 -1 +7 ) =​

Answer 1

Resposta:

a) 8 - (+4 - 1 ) =

= 8 - (+3)

=5

b) -5 ( -2 +3 - 1 )

= -5 × ( 1 - 1)

= -5 × (0)

= 0

c) 18+ (-1 + 8 +2 )

= 18 + (7 + 2)

= 18 + (9)

= 27

d) 20 - ( +6 -1 +7 ) = 20 - ( +5 + 7)

= 20 - (+ 12)

= 8