2 4 x 6 5 0 4 July 8, 2019 16 32 64 128 2 4 xy 6 5 x 0 4 Tìm y 2 4 xy 6 5 x 0 4 2 4 x 0 25 5 6 chia 4 2 x 1 4 6 + 4 = 4
