Oblicz :
a) log <dwa> 128
b)log <jedna trzecia> 81
c)log <25> 5
d)log <7) pierwiastek z 7
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a) log2 128 = log2 2^7 = 7 * log2 2 = 7 * 1 = 7
b) log1/3 81 = log1/3 3^4 = log1/3 * (1/3)^(-4) = - 4
c) log25 5 = log25 √25 = log25 25^(1/2) = 1/2
d) log7 √7 = log7 7^(1/2) = 1/2