5 1 4 x 8 2 7 July 8, 2019 16 32 64 128 1 4 0 7 x 0 8 2 5 7 1 2 5 3 4 x 8 0 20 1 4 x 5 phần 2 x 8 7 5 1/4 / x = 7/8 5 7 - - 4 1/2
