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Exercício 12. Se log8225=a\log _{8} 225=alog8225=a, então log215\log _{2} 15log215 vale: (a) a4\frac{\sqrt{a}}{4}4a (b) a4\frac{a}{4}4a (c) 3a2\frac{3 a}{2}23a (d) 2a3\frac{2 a}{3}32a (e) 3a−13 a-13a−1
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