已知x-y+3=0,求2xy-x^2-y^2+1的值
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已知x-y+3=0,求2xy-x^2-y^2+1的值已知x-y+3=0,求2xy-x^2-y^2+1的值已知x-y+3=0,求2xy-x^2-y^2+1的值x-y=﹣32xy-x²-y
已知x-y+3=0,求2xy-x^2-y^2+1的值
已知x-y+3=0,求2xy-x^2-y^2+1的值
已知x-y+3=0,求2xy-x^2-y^2+1的值
x-y=﹣3
2xy-x²-y²+1
=﹣﹙x-y﹚²+1
=﹣﹙﹣3﹚²+1
=﹣9+1
=﹣8