先化简,再求值 (xy²+3y³-x²y)—(-2x²y+y³+xy²)-4y³,其中x=2,y=3
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![先化简,再求值 (xy²+3y³-x²y)—(-2x²y+y³+xy²)-4y³,其中x=2,y=3](/uploads/image/z/2518606-46-6.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC+%28xy%26%23178%3B%2B3y%26%23179%3B-x%26%23178%3By%29%E2%80%94%28-2x%26%23178%3By%2By%26%23179%3B%2Bxy%26%23178%3B%29-4y%26%23179%3B%2C%E5%85%B6%E4%B8%ADx%3D2%2Cy%3D3)
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先化简,再求值 (xy²+3y³-x²y)—(-2x²y+y³+xy²)-4y³,其中x=2,y=3
先化简,再求值 (xy²+3y³-x²y)—(-2x²y+y³+xy²)-4y³,其中x=2,y=3
先化简,再求值 (xy²+3y³-x²y)—(-2x²y+y³+xy²)-4y³,其中x=2,y=3
(xy²+3y³-x²y)—(-2x²y+y³+xy²)-4y³
=xy²+3y³-x²y+2x²y-y³-xy²-4y³
=-2y³+x²y
=-2×3³+2²×3
=-54+12
=-42
这还不简单,我简直要崩溃!!!