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a=18 , b+c=57
a+5*b+5*c=?


Răspuns :

[tex]a=18 \\ b+c=57 \\ a+5b+5c=a+5(b+c)=18+5 \cdot 57=18+285=303 \\ ~~~~~~~~~~~~~~~~~~~~~~~~ \boxed{a+5b+5c=303}[/tex]