Calculaţi:
a) 32: 16+ {76-2 [(20+4-5): 5] -2.6};
b) (3+6+9+12+15+18): (1+2+3+4+5+6);
c) 3+ 10 {3+10 [3+10 (3+10-3)-3]-3}-3.

Urgent!​