9 3 12 4 2 July 8, 2019 16 32 64 128 9 3 4 x 12 1 2 Simplify 9 12 3 * 4 2 2x 9 3 3x 4 12 12 4 2x 9 )=- 8 x 3 12 x 3 )= 4 2x 9 )+ 4x 7 12 3 4 x 2 9 17 12 3 4 x 2 9 7 12 3 4 x 2 9 bằng bao nhiêu
