(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,y=2.](/uploads/image/z/469584-0-4.jpg?t=%282x%26%23178%3By-2xy%26%23178%3B%29-%5B%28-3x%26%23178%3By%26%23178%3B%2B3x%26%23178%3By%29%2B%283x%26%23178%3By%26%23178%3B-3xy%26%23178%3B%29%5D%2C%E5%85%B6%E4%B8%ADx%3D-1%2Cy%3D2.)
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)],其中x=-1,y=2.
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)],其中x=-1,y=2.
(2x²y-2xy²)-[(-3x²y²+3x²y)+(3x²y²-3xy²)],其中x=-1,y=2.
=2x²-2xy²+3x²y²-3x²y-3x²y²+3xy²
=-x²y+xy²
=-2-4
=-6