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)计算:(3x^2-2y^
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)
计算:(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)
(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
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