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aflati ne nat a si b care verifica egalitatea ab +a=15

Răspuns :

3*4+3=12+3=15 => a=3 si b=4
ab+a=15
a(b+1)=15

15=3×5=1×15

a=3⇒b=4
a=5⇒b=2
a=1⇒b=14