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= 4*(-1) = -4
Korzystamy ze wzoru na zmianę podstawy logarytmu:
log b(c) = log a (c) / log a(b)
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oraz z wzoru
log a(x)^b = b*log a(x)
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4 × log₂6 × log₂ ½/log₂ 6 = 4 × log₂ ½ = 4 × (-1)= -4
Przykład:
log₄16= log₂16/ log₂4= 4/2=2