已知4x-5y=0,求分式4xy+y^2/x^2-2xy的值
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已知4x-5y=0,求分式4xy+y^2/x^2-2xy的值
已知4x-5y=0,求分式4xy+y^2/x^2-2xy的值
已知4x-5y=0,求分式4xy+y^2/x^2-2xy的值
由4x-5y=0
得4x=5y
即y=4/5x
代入(4xy+y²)/(x²-2xy)
=(16/5x2+16/25x2)/(x2-8/5x2)
=(96/25x2)/(-3/5x2)
=32/5
=6.4