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a.- log 9 = log 3² = 2 log 3 = 0.9542 ⇒ log 3 = 0.9542 /2 = 0.4771
log 3 = 0.4771
b.- log 2 = log (5 -3) = log 5 / log 3 = 0.6990 / 0.4771 = 1.4651
c.- log √60 = log (√15 x 4) = log(√15 x √4) = log √15 + log √4
= log √15 + log 2 = (1/2 log 15) +log 2
= (1/2 log [5 x 3]) + log 2 = 1/2 (log 5 + log 3) + log 2
remplazemos valores :
log √60 = 1/2 (0.6990 + 0.4771) + 1.4651 = 2.05315
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