2 5 x 3 15 July 8, 2019 16 32 64 128 1 − 2 5 3 x 15 2 3 3 5 x 15 4 5 x 3 15 1 6 2 5 x 1 5 x 2 5 x 3 155 X 5 3x 4 5x 3 15x 2 4x 12 4 3 x 5 2 x 7 15 3x 5 15 x 3 2 9 4 2 x 5 8 15 3 2 5 x 15 3 8 2 5 =( x 3 )/( 7x 15 0 2 x 5 15 3 18 2 3 3x 6 )= 5 x 3 )+ 15 2 3 5 x 15 26 2 5x 3 )= 15x 29 2 x 3 )= 5x 15