已知x:y=2:3,求(x^2-y^2/xy)÷[(x+y)×(x-y/x)^3]÷(x/y^2)
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y=3x/2

=(x+y)(x-y)/xy*[x^3/(x+y)(x-y)^3]*(y^2/x)

=xy/(x-y)^2

=(3x^2/2)/(-x/2)^2

=(3/2)/(1/4)

=6

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