1.若a-c=-2,c-b=-3,则代数式(a-b)[(a-c)的二次方-(a-c)(c-b)+(c-b)的二次方]的值是______.2.如果代数式4y的二次方-2y+5的值为7,那么代数式2y的二次方-y+1的值为_____.3.已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值.
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![1.若a-c=-2,c-b=-3,则代数式(a-b)[(a-c)的二次方-(a-c)(c-b)+(c-b)的二次方]的值是______.2.如果代数式4y的二次方-2y+5的值为7,那么代数式2y的二次方-y+1的值为_____.3.已知x+4y=-1,xy=5,求(6xy+7y)+[8x-(5xy-y+6x)]的值.](/uploads/image/z/13309560-0-0.jpg?t=1.%E8%8B%A5a-c%3D-2%2Cc-b%3D-3%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F%28a-b%29%5B%28a-c%29%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9-%28a-c%29%28c-b%29%2B%28c-b%29%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%5D%E7%9A%84%E5%80%BC%E6%98%AF______.2.%E5%A6%82%E6%9E%9C%E4%BB%A3%E6%95%B0%E5%BC%8F4y%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9-2y%2B5%E7%9A%84%E5%80%BC%E4%B8%BA7%2C%E9%82%A3%E4%B9%88%E4%BB%A3%E6%95%B0%E5%BC%8F2y%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9-y%2B1%E7%9A%84%E5%80%BC%E4%B8%BA_____.3.%E5%B7%B2%E7%9F%A5x%2B4y%3D-1%2Cxy%3D5%2C%E6%B1%82%286xy%2B7y%29%2B%5B8x-%285xy-y%2B6x%29%5D%E7%9A%84%E5%80%BC.)
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