9x 2 5x 2 =- 4 July 8, 2019 16 32 64 128 9x 2 5x 4 9x 2 5x 4 180 9x 2 5x 3 2 1 4x 1 4x 9x 2 25x 4 X 2 5x 2 9x 45 4 5x 2 )= 2 9x 3 3 5x 2 2 9x 11 4 8x 7 111 9x 2 4x )-( 5x 2 3x 12x 2 9x 5x 4x 2 7x 10 9x 2 5x 4 90 5x 2 4x 9x 2 9x 3 2x 2 5x 3 4x 2 2x 2 6x 5 (- 9x 2 5x 4
