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Aflati nr natural x daca :3+6+9+....+297=150x
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Răspuns :

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[tex]3+6+9+....+297=150x \\ Il~dam~factor~comun~pe~3: \\ 3(1+2+3+....+99)=150x \\ 3* \frac{99(99+1)}{2}=150x \\ 3* \frac{100*99}{2}=150x \\ 3*50*99=150x \\ 150*99=150x \\ \boxed{x=99}[/tex]