1. If log a = 0.4771, log b = 1.4771 and log c = -2.5229, express b and c in
terms of a .
2. Given that 10^x = y , 10^log y = 10^x = y, evaluate 10^4log(開方3)
要steps+解釋
thx a lot!!!
log問題x2,急!20分.
2010-11-01 12:44 am
回答 (2)
2010-11-01 1:27 am
✔ 最佳答案
----------------------------------------------------------------------------------------------------------圖片參考：http://img502.imageshack.us/img502/6923/logp.png
2010-10-31 17:28:37 補充：
http://img502.imageshack.us/img502/6923/logp.png
2010-11-01 1:15 am
1. logb = 1 + loga
logb = log10 + loga
logb = log10a
b = 10a
Also, logc = loga - 3
logc = loga - log1000 (3 = 3log10 = log10^3 = log1000)
logc = log(a/1000)
c = a/1000
2. 10^(4logsqrt3)
= 10^log9 (4logsqrt3 = log[(sqrt3)^4] = log9)
= 9 (using 10^logy = y)
logb = log10 + loga
logb = log10a
b = 10a
Also, logc = loga - 3
logc = loga - log1000 (3 = 3log10 = log10^3 = log1000)
logc = log(a/1000)
c = a/1000
2. 10^(4logsqrt3)
= 10^log9 (4logsqrt3 = log[(sqrt3)^4] = log9)
= 9 (using 10^logy = y)
參考: me
收錄日期: 2021-04-23 22:10:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101031000051KK00873