Question

calcule o valor destas expressões:
a) (+213)-(+26)+(-67)-(-26)+(-146)
b) (-3)x(-4)+(-3)x(+9)

Answer 1

a) (+213)-(+26)+(-67)-(-26)+(-146)
213-26-67+26-146
213-239+26
239-238
0

b) (-3)x(-4)+(-3)x(+9)
12+ (-27)
12-27
-15