X 12 9 x 1 6 x 1 3 July 8, 2019 16 32 64 128 X 1 3 x 9 12 x 2 6 x 1 4 X 1 x 1 then x 12 x 9 x 6 x 3 1 12 x 9 = 12 x 9 5 12 x 12 x 6 12 ×1=12 9 x 12 + 6
