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determinati nr nat n ,astfel incat 5 la puterea n supra 13 la puterean= 7 la puterea n supra 11 la puterea n

Răspuns :

5^n/13^an=7^n/11^n
(5/13^a)^n=(7/11)^n
5/13^a=7/11
5·11=13^a·7
13^a·7=55
13^a=55/7

afla a si inlocuieste in ecuatia initiala