Răspuns:
32 x 93 - 32 x 85 = 32 x (93 - 85) = 32 x 8 = 16 x 2 x 8 = 16 x 16 = 16^2
2^83 - 4^41 = 2^83 - (2^2)^41 = 2^83 - 2^82 = 2^82 x (2 - 1) = 2^82 = 2^(2x41) = (2^41)^2
11 x (5^21 - 5^20 - 5^18) = 11 x 5^18 x (5^3 - 5^2 - 1) = 11 x 5^18 x (125-25 - 1) =
11 x 5^18 x 99 = 11 x 5^(2x9) x 9 x 11 = 11^2 x (5^9)^2 x 3^2 = (11 x 5^9 x 3)^2 = (33 x 5^9)^2
