(-y²/x)的2n次方

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(-y²/x)的2n次方(-y²/x)的2n次方(-y²/x)的2n次方(-y²/x)的2n次方=y^4n/x^2n

(-y²/x)的2n次方
(-y²/x)的2n次方

(-y²/x)的2n次方
(-y²/x)的2n次方=y^4n/x^2n