2 5 x 1 2 3 5 x 7 10 July 8, 2019 16 32 64 128 2 5 x 3 7 2 5 x 4 7 1 10 2 1 x 3 2 3 x 5 2 5 x 7 chấm chấm chấm 2 99 x 101 5 x 7 = 35 5 x 5 x 5 x 5 x 5
