5 x 9 4 12 x 1 July 8, 2019 16 32 64 128 1 5 x 9 4 x 12 6 3 5 x 12 )=- 4 x 9 )+ 1 5 12 x 4 9 x 3 10 4 x 5 x 6 12 x 15 x 9 4 5 x 9 )- 1 5x 3 5 x 12 5 9 x 12 19 4 phần 9 x 12 19 5 + 9 = 14 5 x 5 x 5 x 5 x 5 5 9 x 4
