X 3 8 1 2 2 6 July 8, 2019 16 32 64 128 (- 1 8 2 x 2 6 9 3 3 x 2 )/ 6 2 x 1 )/ 8 3 x 10 5 X 3 x 4 x 1 x 2 2 6x 8 x 2 Cho x nhân 3 8 1 2 2 6 vậy x 6 3 8 x 2 1 2 air filter 8 ⋅ ( − 3 x )