30 5 1 2 x 3 July 8, 2019 16 32 64 128 30 x 2 9 1 5 x 3 20 2 x 5 1 30 3 x 3 4 14 58 30 5 1 2 x (- 9 3 16 8 30 x 1 5 30 / 5 x 3 30×1 5 30 x 2 5