2x 9 x 2 5x 6 July 8, 2019 16 32 64 128 6 5x 2 )- 4 4 2x )= 9 x 2 Cho biểu thức a 2x 9 x 2 5x 6 2x 3 5x 2 6x 9 x 3 2x 9
