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aratati ca numarul a=15/13+151/131+1515/1313+......+151515...15/131313.....13 26 de cifre este natural /-supra

Răspuns :

a=15/13+1515/1313+151515/131313+151515...15(26cifre)/1313...13(26cifre)
a=15/13+15/13+...+15/13(de 13 ori)
a=15/13*13
a=15
Obs. 1515/1313=15/13(am simplificat prin 101)
151515/131313=15/13(am simplificat prin 10101)