化简求值(2X2-2y2)-3(X2y2+X2)+3(X2y2+y2),其中X=-1,y=2

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化简求值(2X2-2y2)-3(X2y2+X2)+3(X2y2+y2),其中X=-1,y=2
化简求值(2X2-2y2)-3(X2y2+X2)+3(X2y2+y2),其中X=-1,y=2

化简求值(2X2-2y2)-3(X2y2+X2)+3(X2y2+y2),其中X=-1,y=2
(2X²-2y²)-3(X²y²+X²)+3(X²y²+y²)=2x²-2y²-3x²y²-3x²+3x²y²+3y²=-x²+y²=-(-1)²+2²=-1+4=3

(2X2-2y2)-3(X2y2+X2)+3(X2y2+y2)
=-x2+y2
=-1+4
=3

(2X²-2y²)-3(X²y²+X²)+3(X²y²+y²)
=(2X²-2y²)-3X²y²-3X²+3X²y²+3y²
=(2X²-2y²)-3X²+3y²
=2X...

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(2X²-2y²)-3(X²y²+X²)+3(X²y²+y²)
=(2X²-2y²)-3X²y²-3X²+3X²y²+3y²
=(2X²-2y²)-3X²+3y²
=2X²-2y²-3X²+3y²
=y²-X²
带入值X=-1,y=2
原式=2²-(-1)²=4-1=3
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