Question

suma nr nat ab care verifica egalitate ab+ba=55t ab care verifica egalitatea ab+ba=55 este:

Answer 1

scriem in baza 10 si avem :
10a+b+10b+a=55
11a+11b=55
11×(a+b)=55 | : 11
a+b= 5
nr pot fi : 14, 23, 32, 41.
14+23+32+41=110

Answer 2

(10a+b)+(10b+a)=55
11a+11b=55
11×(a+b)=55 | : 11
a+b= 5;,a si b diferite de 0
Asadar numerele pot fi : 14, 23, 32, 41
suma lor:
14+23+32+41=110