(log 2)^2 + (log 5)^2 + log 5 x log 4
更新1:
我唔明 (log2)^2 + (log5)^2 + 2log5log2 跟着點解等於 [log2 + log5]^2 ?? thx
log...
2006-11-06 1:30 am
without using calculator,, evaluate:
(log 2)^2 + (log 5)^2 + log 5 x log 4
(log 2)^2 + (log 5)^2 + log 5 x log 4
回答 (1)
2006-11-06 2:01 am
✔ 最佳答案
(log 2)^2+(log 5)^2+log5 x log 4=(log 2)^2+(log 5)^2+log 5 log 2^2
=(log 2)^2+(log 5)^2+2 log 5 log 2
=(log 2+log 5)^2
=[log(2 x 5)]^2
=(log 10)^2
=1^2
=1
Because (a+b)^2=a^2+2ab+b^2
收錄日期: 2021-04-23 00:12:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061105000051KK04000