Question

Determinati nr nat ab( in baza 10) care indeplineste relatia ab( in baza 10 )+a*b=54

Answer 1

10a+b+ a * b=54
a=1
10+b+1 * b= 54    | -10
2b=44    nu merge b=o  cifra
a=2    
20 + b+2b=54   | - 20
3b=34  nu merge
a=3
30+b+3b=54     |-30
4b=24      b=6