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3 .log x + log 1/x - log x² = log(x³)(1/x) - log x²
=log x² - log x²
= 0
b)
log 22,5 = log(225/10 = log 225 -log 10
= log 15² - 1
= 2 log 15 - 1
= 2 (log 3 + log 5) - 1
= 2(0,477 +0,699) -1
= 1,352
log 67.5 = log 675 - log 10
= log (3³.5²) - 1
= 3.log 3 + 2 log 5 - 1
= 3(0,477) + 2(0,699) - 1
= 1,829