3^(X+1)=2(5^X)
求步驟
ans = -1.46 (corr.2d.p.)
log (1題) (20點!!!!!!)
2010-02-15 1:59 am
回答 (2)
2010-02-15 3:11 am
✔ 最佳答案
3^(x+1)=2(5^x)=>log (3^(x+1))=log(2(5^x))
=>(x+1)log3=log2+xlog5
=>xlog3+log3=log2+xlog5
=>x(log3-log5)=log2-log3
=>xlog(3/5)=log(2/3)
=>x=log(2/3)/log(3/5)=0.79//
2010-02-15 2:35 am
The answer is wrong, it should be +0.79
收錄日期: 2021-04-23 23:25:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100214000051KK00660