20 7 4 x5 July 8, 2019 16 32 64 128 Solve 4 5 x 7 )= 20 4 5 x 7 )= 20 7 x 5 3 3 20 4 X 5 4 7 5 9 phần 20 35 20 5 4 x 7 7 x 4 13 x 5 20 Solve 2 4 x 5 7 x 20 2 5x 20 7 x 4 4 5 x 3 10 x 20 7 X times 4 5 7 20 7 4 x )- 5 3x 20 4x 7 20 4 5 x 2 3 30 20 5 4 x 7