Question

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Answer 1

Regula :

${5}^{x} = u( {5}^{x} ) = 5 \\ {6}^{x} = u( {6}^{x} ) = 6$

a)

$u( {5}^{102} ) = 5$

b)

$u( {5}^{107} ) = 5$

c)

$u({6}^{105} ) = 6$

observatie :

u ( x² ) = ultima cifra a numarului x²