3 7 2x 4 10 July 8, 2019 16 32 64 128 3 2x 7 )= 4 x 10 7 3 4 2x )- 10x 3 7 2x4 )+ 10 2x 3 3x 4 7 10 5x 3x 7 4 2x 6x 3 10 -2 4 + 3 7 3 7×4 2