x^n(y^2n-1)/x^n-1(y^n+1)
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x^n(y^2n-1)/x^n-1(y^n+1)
x^n(y^2n-1)/x^n-1(y^n+1)
x^n(y^2n-1)/x^n-1(y^n+1)
原式=x^[n-(n-1)]*y^[(n-1)-(n+1)]
=xy^(-2)
=x/y²
x^n(y^2n-1)/x^n-1(y^n+1)
x^n(y^2n-1)/x^n-1(y^n+1)
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