化简(2x²-2y²)-3(x²y²+y²)+3(x²y²+y²),其中x=-1,y=2

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化简(2x²-2y²)-3(x²y²+y²)+3(x²y²+y²),其中x=-1,y=2

(2x²-2y²)-3(x²y²+y²)+3(x²y²+y²)=2x²-2y²=2-8=-6