(2x2-2y2)-3(x2y2+x2)+3x2y2+y2.提示:x=-1,y=2 化简求值

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(2x2-2y2)-3(x2y2+x2)+3x2y2+y2.提示:x=-1,y=2 化简求值
(2x2-2y2)-3(x2y2+x2)+3x2y2+y2.提示:x=-1,y=2 化简求值

(2x2-2y2)-3(x2y2+x2)+3x2y2+y2.提示:x=-1,y=2 化简求值
(2x²-2y²)-3(x²y²+x²)+3x²y²+y²
=2x²-2y²-3x²y²-3x²+3x²y²+y²
=-x²-y²
=-1-4
=-5

-(x2+y2)=-5