Question

Calcule
a) +(+30)-(+6)-(-1)+(+5)=
b) -(-12)+(-15)-(-5)+(-3)=
c) -(+20)-(+12)-(-30)+(+10)=
d) +(+12)-(-3)-(+5)+(-6)=

Answer 1

Resposta:

(+).(+) = +

(+).(-) = -

(-).(-) = +

(-).(+) = -

a) 30 - 6 + 1 + 5 = 30

b) 12 - 15 + 5 -3 = -1

c) 20 - 12 + 30 + 10 = 48

d) 12 + 3 - 5 - 6 = 4