被减数-x 减数-y 差-zx+y+z=256z-y=32 =>z=32+yx-y=z =>x= y+z=32+2*y256=x+y+z=(32+2*y)+y+(32+y)=64+4y =>y=(256-64)/4=48x=32+2*y=32+2*48=128z=32+y=32+48=80被减数128 减数48 差80