2 1 4 x 7 9 x 3 4 July 8, 2019 16 32 64 128 1 4 3 x )- 0 9 x 2 )= 4 7 9 3 4 l x 7 1 2 h x 4 3 4 w 2 3/4 x 1 7/9 2 9×+7 4=×+1 7
