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Daca a,b,c apatin numerelor naturale si ab+ca=715 calculati 18ax(5b+5c}nivel de clasa a 5-a

Răspuns :

[tex]ab+ca=715 \\ 18a(5b+5c)=90ab+90ac=90(ab+ac)=90 \cdot715=\boxed{64350}[/tex]