3 8 9 x 1 3 4 July 8, 2019 16 32 64 128 3 1 2 x 8 1 2 x 9 3 4 4 x 3 y 3 8 x 9 y 1 3 8×9 4 3 x 3 = 9 3 4 × 8 9 3 9×4 8
