4 9 7 3 x 1 5 July 8, 2019 16 32 64 128 4 3 7 5 * x 1 2 4 9 1 5 7 3 4 x 9 1 5 in fraction form 7 18 5 3 x 1 3 9 55 4 4 9 7 phần 3 chia x bằng 1 5 9 4 - 7 3 5 x 7 = 35 4 7/9 x/9 5 6/9
