81 {}^{17} \times 7 {}^{4} = (9 {}^{2}) {}^{17} \times (7 {}^{2}) {}^{2} = (9 {}^{17}) {}^{2} \times (7 {}^{2}) {}^{2} = (9 {}^{17} \times 7 {}^{2}) {}^{2} \: rezulta \:ca \: e \: patratul \: unui \: nr \: nat
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81 {}^{17} \times 7 {}^{4} = (9 {}^{2}) {}^{17} \times (7 {}^{2}) {}^{2} = (9 {}^{17}) {}^{2} \times (7 {}^{2}) {}^{2} = (9 {}^{17} \times 7 {}^{2}) {}^{2} \: rezulta \:ca \: e \: patratul \: unui \: nr \: nat