c)
log0,9 = log ( 9 : 10) = log9 - log10 = log3² - 1 = 2log3 - 1 = 2 · 0,48 - 1 = 0,96 - 1 = - 0,04
d)
log0,81 = log ( 81 : 100) = log 81 - log100 = log 3⁴ - 2 = 4log3 -2 = 4· 0,48 - 2 = 1,92 - 2 =
= - 0,08
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c)
log0,9 = log ( 9 : 10) = log9 - log10 = log3² - 1 = 2log3 - 1 = 2 · 0,48 - 1 = 0,96 - 1 = - 0,04
d)
log0,81 = log ( 81 : 100) = log 81 - log100 = log 3⁴ - 2 = 4log3 -2 = 4· 0,48 - 2 = 1,92 - 2 =
= - 0,08