X 9 4 23 5 July 8, 2019 16 32 64 128 X chia 9 4 23 5 9 5x 4 x 23 5 2 x 9 23 − 4 5x 11 23 5 x 9 4 bằng bao nhiêu 56 4 x 9 23 X - 9/23 = 5/23
