+45 - (+3). (+15)=
- 45 - (+3) . (-15)=
-1 - (+2)-(+3) =
10 - 2 . 5 =
-36 - ( -16) -(+20) =
0 - (+ 3 ) + ( - 3) =
30 - 2 . 15
-40 - ( -5).( + 8) =
- 6 - - 5- 1=