4) (5^-2)^-1 = 5^2 = 25
5) (8^-2) * (4^3) = ((2^3)^-2) * ((2^2)^3) = (2^-6) * (2^6) = 2^0 = 1
6) (10^0)/(10^-3) = 10^3 = 1000
7) (10^8) * (10^-5) * (10^-4) = 10^-1 = 0,1
4) (5^-2)^-1 = 5^2 = 25
5) (8^-2) * (4^3) = ((2^3)^-2) * ((2^2)^3) = (2^-6) * (2^6) = 2^0 = 1
6) (10^0)/(10^-3) = 10^3 = 1000
7) (10^8) * (10^-5) * (10^-4) = 10^-1 = 0,1