Maths 對數
2015-04-11 7:57 pm
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回答 (2)
2015-04-11 8:13 pm
✔ 最佳答案
1. log x =-5/6
x=10^(-5/6)
x=0.147
2. log_3 x =2.6
x=3^2.6
x=17.4
3.log_0.4 x =0.9
x=0.4^0.9
x=0.438
4.log_(3/4) x =-2.5
x=(3/4)^-2.5
x=2.05
5.log_100 x -log x= 1
log x /log100 -log x= 1
(1/2)log x -log x= 1
-(1/2)log x = 1
log x = -2
x=10^-2
x=0.01
2015-04-11 10:50 pm
1.
log x=-5/6
x=10^(-5/6)
x=0.146779956
2.
log x /log 3=2.6
log x=2.6 log 3
log x=log 3^2.6
x=3^(2.6)
x=17.3986384
3.
log x /log 0.4=0.9
log x=0.9 log 0.4
log x= log (0.4^0.9)
x=(0.4)^(0.9)
x=0.43838329
4.
log x /log(3/8)=-2.5
log x=-2.5 log (3/8)
log x=log (3/8)^-2.5
x=(3/8)^(-2.5)
x=11.61239582
5.
(log x)/(log 100) - log x=1
(log x)(0.5-1)=1
-0.5(log x)=1
log x=-2
x=10^2
x=100
log x=-5/6
x=10^(-5/6)
x=0.146779956
2.
log x /log 3=2.6
log x=2.6 log 3
log x=log 3^2.6
x=3^(2.6)
x=17.3986384
3.
log x /log 0.4=0.9
log x=0.9 log 0.4
log x= log (0.4^0.9)
x=(0.4)^(0.9)
x=0.43838329
4.
log x /log(3/8)=-2.5
log x=-2.5 log (3/8)
log x=log (3/8)^-2.5
x=(3/8)^(-2.5)
x=11.61239582
5.
(log x)/(log 100) - log x=1
(log x)(0.5-1)=1
-0.5(log x)=1
log x=-2
x=10^2
x=100
收錄日期: 2021-04-15 19:03:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150411000051KK00032