[9^2-2^4inmultit 5^9:(5^4)^2]:2^2

Răspuns :

[9^2-2^4×5^9÷(5^4)^2]÷2^2=
(9^2-2^4×5^9÷5^8)÷2^2=
(9^2-4^2×5^9÷5^8)÷2^2=
(9^2-4^2×5)÷2^2=
(81-16×5)÷2^2=(81-80)÷2^2=
1÷2^2=2^0÷2^2=2^-2