2 x 9 =- 7 4x 3 July 8, 2019 16 32 64 128 2x 9 4x 7 x 3 4x 2 9 =( x 7 )( 2x 3 3 4x 7 )- 2 x 9 )= 31 3x 7 x 2 9 4x 37x 1 2 x 1 4 9 4x 7 5 7 2 x 3 6 9 4x 8 2x 7 2x 9 2 9 + (-7 4) 9 x 8 =
