2（x^3-2y^2)-(x-2y)-(x-3t^2+2x^3),其中x=-3,y=-2

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2（x^3-2y^2)-(x-2y)-(x-3t^2+2x^3),其中x=-3,y=-2

2（x^3-2y^2)-(x-2y)-(x-3t^2+2x^3),其中x=-3,y=-2
2（x^3-2y^2)-(x-2y)-(x-3t^2+2x^3),其中x=-3,y=-2

2（x^3-2y^2)-(x-2y)-(x-3t^2+2x^3),其中x=-3,y=-2
2（x^3-2y^2)-(x-2y)-(x-3t^2+2x^3),其中x=-3,y=-2
=2x³-4y²-x+2y-x+3y²-2x³
=-2x-y²+2y
=-2×(-3)-(-2)²+2×(-2)
=6-4-4
=-2;
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2（x^3-2y^2)-(x-2y)-(x-3y^2+2x^3)
=2x³-4y²-x+2y-x+3y²-2x³
=-y²-2x+2y
当x=-3，y=-2时
原式=-9+6-4
=-7

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