2 3 6x 9 )-( 4x 1 July 8, 2019 16 32 64 128 1 2 4x 2 )- 2 3 6x 9 ≤ 4 2 3 6x 9 )= 1 2 4x 8 2 6x 6 3 4x 1 9 1 2 4x 2 )- 2 3 6x 9 ) 4 6x 3 4x 1 2 9 10x 4x 3 11x 2 6x 9 4x 3 6x 2 20x 9 2x 1 6xy - 4y + 6 - 9x