(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1,y=2
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(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)]其中x=-1(2x²y-2xy
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1,y=2
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1,y=2
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)] 其中x=-1,y=2
