Question

Afla toate numerele de forma ab <63 cu a=b+3.

Answer 1

$10(b+3)+b\ \textless \ 63$
$10b+30+b\ \textless \ 63$
$11b\ \textless \ 33$
$b\ \textless \ 3$
$b=0,1,2$
$a=3,4,5$
$Rasp:10,12,13,14,15,20,21,23,24,25,30,31,32,34,35,40,41,42,43,$$45,50,51,52,53,54$