Question

Am nevoie urgent exercițiul 2

Answer 1

Răspuns:

xy=3x+5y

10x+y=3x+5y

10x-3x=5y-y

7x=4y=>x=4 si y =7

nr xy=47

Answer 2

$\it \overline{xy} =3x+5y \Rightarrow 10x+y=3x+5y \Rightarrow 10x-3x=5y-y \Rightarrow \\ \\\Rightarrow 7x=4y\ \ \ \ (1)\\ \\ (4,\ 7)=1\ \ \ \ \ (2)\\ \\ (1),\ (2)\Rightarrow x=4,\ \ y=7 \Rightarrow\ \overline{xy}=47$