Question

Determinati numarul natural ab stiind ca numarul ab+ba este patrat perfect!! Dau coroana

Answer 1

ab+ba=10a+b+10b+a=11a+11b=11(a+b)

11(a+b) e patrat perfect => a+b=11

ab={29, 38, 47, 56, 65, 74, 83, 92}