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aratati ca daca (2a+3b+c),atunci 7|abc(cu bara deasupra)
Multumesc!


Răspuns :

[tex]7~|~7(14a+b) \Leftrightarrow 7~|~98a+7b. \\ \\ Cum~7~|~2a+3b+c~si~7~|~98a+7b,~rezulta~ca~ \\ \\ 7~|~(2a+3b+c)+(98a+7b) \Leftrightarrow 7~|~100a+10b+c~\Leftrightarrow \boxed{7~|~ \overline{abc}}~.[/tex]