8. Efectuati:
a) [2^0+(-3)]^2 x (-4+6)^5 x (8-10)^6 - 2^10 x (-1+3)^3;
b) [(-2 + 5)^4 x 3^6] : 3^3 : (-7+4)^4 + (-3)^3;
c) {[10 : (-5)]^12 : 64 - 15} - (-7)^2.