4x 5 x 9 )= 12 July 8, 2019 16 32 64 128 4x 1 12 7 4 5 x 9 4x 2 12x 9 =( 5 x 2 X 4x − 9 )+ 5 x 12 )= 4 x2 10 2x 9 4x 3 5 x 12
