22.已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值.
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22.已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值.
![22.已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值.](/uploads/image/z/4388378-50-8.jpg?t=22%EF%BC%8E%E5%B7%B2%E7%9F%A5x%2B4y%3D%EF%BC%8D1%2Cxy%3D5%2C%E6%B1%82%286xy%EF%BC%8B7y%29%EF%BC%8B%5B8x%EF%BC%8D%285xy%EF%BC%8Dy%EF%BC%8B6x%29%5D%E7%9A%84%E5%80%BC.)
原式=6xy+7y+8x-5xy+y-6x=xy+8y+2x=xy+2(x+4y)=5-2=3
22.已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值.
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