1) 3 * 12^(-2) = 3 / 12^2 = 3 / (3 * 4)^2 = 3 / (3^2 * 4^2) = 1 / 3 * 4^2 = 1 / 3 * 16 = 48
2) 2^(-3) + 6^(-1) = 1 / 2^3 + 1 / 6 = 1 / 8 + 1 / 6 = 3 / 24 + 4 / 24 = 7 / 24
3) 3^(-2) - (-3)^(-1) = 1 / 3^(2) + 1 / 3^(1) = 1 / 9 +1 / 3 = 1 / 9 + 3 / 9 = 4 / 9
4) -2 * 4^(-3) = - 2 * (2^2)^(-3) = -2 * 2^(-3 * 2) = -2 * 2^(-6) = -2^(-6 + 1) = - 2^(-5) = -32
5) 3 * 4^(-2) + 2^(-3) = 3 / 4^2 + 1/ 2^3 = 3 / 16 + 1 / 8 = 3 / 16 + 2 /16 = 5 / 16
6) 0,4^0 - (-0,25)^(-3) = 1 + 1 / 0,25^3 = 1 + 1 / (1 / 4)^3 = 1 + 4^3 = 1 + 64 = 65