log0.8 0.5怎么求?已知lg2=0.3010

log0.8 0.5怎么求?已知lg2=0.3010

lg0.5/lg0.8

问答/446℃/2025-04-06 02:27:10

优质解答:

lg0.5/lg0.8

=lg(1/2)/lg(4/5)

=-lg2/(lg4-lg5)

=-lg2/(2lg2-(1-lg2))

=lg2/(3lg2-1)

即:原式=0.3010/(3*0.3010-1)=-3.103

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