[tex]\it 45\Big|\overline{4xy}\ \Rightarrow 5|\overline{4xy} \Rightarrow y\in\{0,\ 5\}\ \ \d si\ 9|\overline{4xy} \Rightarrow 9|(4+x+y)\\ \\ I)\ \ y=0 \Rightarrow 9|(4+x) \Rightarrow x=5 \Rightarrow 45|450\\ \\ II)\ \ y=5 \Rightarrow 9|(4+x+5) \Rightarrow 9|(9+x) \Rightarrow x\in\{0,\ \ 9\} \Rightarrow 45|405;\ \ 45|595[/tex]
Numerele cerute sunt: 405, 450, 495 .
