15 x 2 4 chia 2 July 8, 2019 16 32 64 128 15 2 x chia 3 7 4 5 2 X 15 chia 4 5 mũ 2 trừ 2 mũ 3 15 x 28 x chia 2 5 200 chia 0 4 15 x 4 - 2 15 x 10 15 3/4 x 2
