x,y满足（x+2）²+丨y-1丨＝0,则x+2=0,x=-2；y-1=0,y=13x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y=3x²y-（2xy²-2xy+3x²y+2xy）-2x²y=3x²y-2xy²-3x²y-2x²y...