(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2=xy^2) 其中x=-1 y=2(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2+xy^2) 其中x=-1 y=2
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(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2=xy^2)其中x=-1y=2(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2
(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2=xy^2) 其中x=-1 y=2(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2+xy^2) 其中x=-1 y=2
(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2=xy^2) 其中x=-1 y=2
(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2+xy^2) 其中x=-1 y=2
(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2=xy^2) 其中x=-1 y=2(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2+xy^2) 其中x=-1 y=2
(3x^2y-2xy^2)-(xy^2-2x^2y)-3(x^2y^2+x^2y)+3(x^2y^2+xy^2)
=3x^2y-2xy^2-xy^2+2x^2y-3x^2y^2-3x^2y+3x^2y^2+3xy^2
=2x^2y
=2(-1)^2×2
=4
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