已知x^2+4y^2=4xy,求x+2y/x-y的值
2个回答
x^2+4y^2=4xy
x^2+4y^2-4xy=0
(x-2y)^2=0
x-2y=0
x=2y
(x+2y/(x-y)
=4y/y=4
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