5 7 x 2 5 1 3 July 8, 2019 16 32 64 128 7 8 x 2 5 1 5 x 2 3 7 x 2 )= 5 3x 1 Tính 7 8 x 2 5 1 5 x 2 3 5 x 7 = 35 5 x 5 x 5 x 5 x 5 5 x 5 x 5
