Question

determinati toate numerele ab care au proprietatea ca 3a + 5b supra 10 apartin numerlelor naturale

Answer 1

3a+5b∈D10=(1,2,5,10)
3a+5b=1 falsa
3a+5b=2 falsa
3a+5b=5⇒a=0⇒b=1 adevarata
3a+5b=10⇒a=0⇒b=2 adevarata
ab-numar de o cifra;
ab=(1;2)