3 8 x 2 2 5 x 3 1 3 July 8, 2019 16 32 64 128 X 3 2 5 20 /( x 3 2 8 x 3 5 2 x 3 )+ 1 5 2 3 x 6 2 3 x 8 1 3 3 2 x 1 6 5 3 x 7 2 13 8 x 4 3 2 3/8+3 1/8-x=1 5/8 3 5×(-2 8)