计算:(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)
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计算:(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)
![计算:(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)](/uploads/image/z/399332-20-2.jpg?t=%E8%AE%A1%E7%AE%97%3A%283x%5E2-2y%5E2%29-%28-x%5E2%2B2xy%2By%5E2%29-%28x%5E2-4xy%2B3y%5E2%29)
(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)
=3x²-2y+x²-2xy-y²-x²+4xy-3y²
=3x²+2xy-6y²
=3x²-2y+x²-2xy-y²-x²+4xy-3y²
=3x²+2xy-6y²
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