Question

1. Efetue as adições com números inteiros. a) ( + 12 ) + ( + 21 ) =
b) ( + 13 ) + ( + 7 ) =
c) ( + 23 ) + ( + 21) =
d) ( – 12 ) + ( – 11 ) =
e) ( – 23 ) + ( – 4 ) =
f) ( – 21 ) + ( – 12 ) =
g) ( + 10 ) + ( – 13 ) =
h) ( + 21 ) + ( – 23 ) =
i) ( + 40 ) + ( – 17 ) =

Answer 1

a) 33
b) 20
c) 43
d) - 23
e) - 27
f) - 33
g) - 3
h) - 2
i) 23