log=]
回答 (4)
2007-10-16 5:19 am
✔ 最佳答案
log40 + log25 = log(23 X 5) + log52
= log23 + log5 + 2log5
= 3log2 + 3log5
= 3(log2 + log5)
= 3log(2 X 5)
= 3log10
= 3
Another method:
log40 + log25
= log(40 X 25)
= log1000
= 3
參考: Myself~~~
2007-10-18 5:58 am
我覺得一開始用alternative method 就得。
為左寫長而寫而好無聊。
為左寫長而寫而好無聊。
2007-10-16 5:20 am
log40 + log25
= log(2*2*2*5)+ log(5*5)
= log(2*2*2) + log5 + 2log5
= 3log2 + 3log5
= 3(log 2+ log 5)
= 3(log 10)
= 3(1)
=3
= log(2*2*2*5)+ log(5*5)
= log(2*2*2) + log5 + 2log5
= 3log2 + 3log5
= 3(log 2+ log 5)
= 3(log 10)
= 3(1)
=3
2007-10-16 5:18 am
log40 + log25
=log (40x25)
=log 1000
= log 10^3
=3
=log (40x25)
=log 1000
= log 10^3
=3
收錄日期: 2021-04-23 17:23:21
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071015000051KK03936