已知x=3y,试求(x+y)^2+2xy-y^2/x^2+7xy+y^2的值
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已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
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