👤

4) Efetue
a) (+3) +(-2) +(-5)
b)(-2)-(+1)-(-5)
c)(+4)+(-2)-(+3)
d)(+5)-(-3)-(-1)=
e) (+4) +(-6)-(+7)-(-6)+(+7)=
f) (-3)-(-5)+(-6)+(+8)-(-4)=​