5 2x 1 125 x 25 July 8, 2019 16 32 64 128 5 mũ 2x 1 125 mũ x 25 5 2x 1 25 125 find x 5 2x-1=125 5 ^ (2x + 1) = 1/125 5 1-2x 1/125
