Question

1 Efetue estas adições.
a) (+8) + (–3) + (+7) =
b) (–5) + (–2) + (+3) =
c) (–12) + (–9) + (+1) =

Answer 1

a) (+8) + (-3) + (+7)

8 - 3 + 7

12

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

-5 - 2 + 3

-4

c) (-12) + (-9) + (+1)

-12 - 9 + 1

-20

Answer 2

→ Cálculo :

A) ( + 8 ) + ( - 3 ) + ( + 7 )

8 - 3 + 7

15 - 3

12

B) ( - 5 ) + ( - 2 ) + ( + 3 )

- 5 - 2 + 3

- 7 + 3

-4

C) ( - 12 ) + ( - 9 ) + ( + 1 )

- 12 - 9 + 1

- 21 + 1

-20