Question

+13-7+8-13
+9-4+7-12
Me ajudem pfv

Answer 1

Resposta:

+13-7+8-13 // +13-13=0

-7+8

=1

+9-4+7-12

9-4 + 7- 12

9-4 + -5

9 - 4 -5 // -4 +(-5)= -9

9-9

=0