已知2x+y=0,求x-2y/x^2+xy乘以x^2-y^2除以x^2-4xy+4y^2/x的值.已知2x+y=0,求x-2y/x^2+xy 乘以 x^2-y^2 除以 x^2-4xy+4y^2/x的值.
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