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Exerciții care au la bază regulile de calcul cu puteri.

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Scris sub formă de putere produsul $\underset{25 f a c t o r i}{\underset{⏟}{3 \cdot 3 \cdot 3 \cdot . . . \cdot 3}}$ este:
$7^{138} : 7^{102} =$
${(2^{12})}^{15} : {(2^{15})}^{12} =$