Răspuns: [tex]\bf \overline{x3y}\in \{130,230,330,430,530,630,730,830,930\}[/tex]
Explicație pas cu pas:
Salutare!
[tex]\bf \overline{x3y}\:\: \vdots\:\:10[/tex]
[tex]\bf x, y - cifre[/tex]
[tex]\bf x,y \in\{0,1,2,3,4,5,6,7,8,9\}[/tex]
[tex]\bf x\neq 0[/tex]
Criteriul de divizibilitate cu 10: " Un număr se divide cu 10 daca si numai daca are ultima cifra 0" ⇒ y = 0
[tex]\bf x \in\{1,2,3,4,5,6,7,8,9\}\implies\boxed{\bf \overline{x3y}\in \{130,230,330,430,530,630,730,830,930\}}[/tex]
[tex]\bf \overline{x3y}\in \{130,230,330,430,530,630,730,830,930\}[/tex]
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