Question

Determinati nr naturale de forma ab stiind ca 2ab+ 2ba=132

Answer 1

2ab+2ba=132 <=> ab+ba=66 <=> 10a+b+10b+a=66 <=> 11a+11b=66 <=> 11(a+b)=66 <=> a+b=6.

a=1=>b=5 => ab=15
a=2=>b=4 => ab=24
a=3=>b=3 => ab=33
a=4=>b=2 => ab=42
a=5=>b=1 => ab=51