1 4x 5 12 July 8, 2019 16 32 64 128 1 125 4x 5 4x 1 18x x 5 12x 1 4x 2 3x 1 12x 5 2x 1 4 5 4x 12 4x 1 3 x 5 12 12x 1 4x 5 1 4x 12 5 3x 9 (- 1 4x 3 5 12x 7 1 3 4x 5 12 7 (- 1 4x )- 12x 5 1 4x 2 3x 5 12 1 4x 2 =- 6 5 12x 1 4x 3 12x 5 1 2 4x 12 )= 5 1 4x 5 )+( 1 2x 12