化简求值:[4(xy-1)²-(xy+2)(2-xy)]÷ -1/4 xy,其中x=-2,y=1/5
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化简求值:[4(xy-1)²-(xy+2)(2-xy)]÷ -1/4 xy,其中x=-2,y=1/5
注意:是-1/4xy
注意:是-1/4xy
![化简求值:[4(xy-1)²-(xy+2)(2-xy)]÷ -1/4 xy,其中x=-2,y=1/5](/uploads/image/z/5374467-27-7.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%3A%5B4%28xy-1%29%26%23178%3B-%28xy%2B2%29%282-xy%29%5D%C3%B7+-1%2F4+xy%2C%E5%85%B6%E4%B8%ADx%3D-2%2Cy%3D1%2F5)
化简结果是:-20xy+32代入得40
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