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Urgent! Dau coroanaaaaaa!!!!!!!!!!

Urgent Dau Coroanaaaaaa class=

Răspuns :

2.   {6,  7,  8}

3. x=5

[tex]\it 4.\ \ D_{18} = \{1,\ \ 2,\ \ 3,\ \ 6,\ \ 9,\ \ 18\}[/tex]