因为为相反数,所以2x^2-2xy+3+y^2+4x+1=0,易得x=-2,y=-2,代入-x^2y^2-25+4xy=-(-2^)2(-2^)2-25+16=-25,
已知2x^2-2xy+3与y^2+4x+1互为相反数,求多项式-x^2y^2-25+4xy的值.
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