X 3 18 2 5 x 4 July 8, 2019 16 32 64 128 Y 3 18 2 5 x 4 3 x 2 y 18 5 x 4 y 8 X 18 chia 3 mũ 2 5 x 4 mũ 2 2x x 3 5 x 4 18 x 2 3x X / 18 = 2 / 3
