Ответ:
1)=4n
2)=(n^6-3n^4+3n^2-1)/n^4
3)4n^2/(2n-2)^2
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Ответ:
1)=4n
2)=(n^6-3n^4+3n^2-1)/n^4
3)4n^2/(2n-2)^2