2) Calcule o valor das expressões: 1) 30-(5+3) =
2) 15+ (8 + 2) =
3) 25 - (10-1-3) =
4)23 - (2 + 8) - 7=
5) (10.5) - (1 + 6) =
67-(8-3) + 1 =
7)25-10+ [7 - 4) =
8) 32 - (10-19 - 4) + 8) =
9) 45 -12- 4+ (2 + 1)] =
10) 70 - 120 - [10 - (5 - 1)]) =
11) 28+ (13-16-(4 + 1) + 2] - 1) =
12) 53 - 20 - 30 - (15-1+6) + 2]) =
13) 62 - 16 - 17 - (6 - 4) + 1]) =
1420 - 18+ [3+ (8-5) - 1] + 6) =
15) 15 +{25-[2-(8-6)] + 2) =​