已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·(5/x+y)-(y/x-y
2个回答
x^2+y^2-4x+6y+13=0可以化成(x-2)^2+(y-3)^2=0
所以x=2,y=3
后面的代数你自己算吧
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