[tex]\it 4|\ \overline{4x2y} \Rightarrow 4|\ \overline{2y} \Rightarrow y\in\{0,\ 4,\ 8\}\\ \\ \\ I)\ y=0\ \c{s}i\ 3|\ \overline{4x20} \Rightarrow 3|(4+x+2+0) \Rightarrow 3|(6+x)\Rightarrow x\in \{0,\ 3,\ 6,\ 9\}[/tex]
Se obțin numerele: 4020, 4320, 4620, 4920.
[tex]\it II)\ y=4\ \c{s}i\ 3|\ \overline{4x24} \Rightarrow 3|(4+x+2+4) \Rightarrow 3|(10+x)\Rightarrow x\in \{2,\ 5,\ 8\}[/tex]
Se obțin numerele: 4224, 4524, 4824.
[tex]\it III)\ y=8\ \c{s}i\ 3|\ \overline{4x28} \Rightarrow 3|(4+x+2+8) \Rightarrow 3|(14+x)\Rightarrow x\in \{1,\ 4,\ 7\}[/tex]
Se obțin numerele: 4128, 4428, 4728.
