(x+1)的2次方+丨y-1/2丨=0∴x+1=0 y-1/2=0∴x=-1 y=1/22(xy的2次方+x的2次方y)-[2xy的2次方-3(1-x的2次方y)]-2=2xy²+2x²y-2xy²+3-3x²y-2=-x²y+1当x=-1,y=1/2时原式=-1/2+1=1/2
(x+1)的2次方+丨y-1/2丨=0素x+1=y-1/2=0所以x=-1.y=1/2所以原式=2xy²+2x²y-2xy²+3-3x²y-2=-x²y+1=-1/2+1=1/2