Question

calcule:

+8+7
9+3
-10+5
-2-8
-9-12
-8+8

Answer 1

15<br />12<br />-5<br />-10<br />-21<br />0<br />acredito que seja apenas isso

Answer 2

1) 15
2) 12
3) -5
4)-10
5)-21
6) 0