12 1 x 8 9 July 8, 2019 16 32 64 128 11 1 12 x 9 1 8 12 1 8 x 9 1 4 x 4 12 3 8 x 9 1 4 10 9 12 x 8 1 2 10x 3 12 1 6 8 x phần 9 12 x 8/9 12 ×1=12 12 x 1/9
