2x²-2y²-3x²y²+x²+3x²y²+y&
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2x²-2y²-3x²y²+x²+3x²y²+y² ,其中x=-1,y=2
![2x²-2y²-3x²y²+x²+3x²y²+y&](/uploads/image/z/18407066-50-6.jpg?t=2x%26%23178%3B-2y%26%23178%3B-3x%26%23178%3By%26%23178%3B%2Bx%26%23178%3B%2B3x%26%23178%3By%26%23178%3B%2By%26)
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=2X^2+X^2-2Y^2+Y^2
=3X^2-Y^2
X=-1,Y=2
得3X^2-Y^2=3-4=-1
=2X^2+X^2-2Y^2+Y^2
=3X^2-Y^2
X=-1,Y=2
得3X^2-Y^2=3-4=-1
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