5 12 x 4 2 3 July 8, 2019 16 32 64 128 5 12 1 4 x =- 2 3 3x 5 12 x )=- 3x 4 2 7 3x 5 x 2 4 =( 3x 2 )- 12 5 3 4 x 12 x 2 filter 5 3 4 x 12 x 2 air filter 12 6 2 5 x 4 2 3 5 12 5 x 10 3 x 2 4 4x x 5 )- 7x x 4 )+ 3x 2 12 4 5 12 3 7 x 2 - 5 * 12 4*(-2)
