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請回答以上問題
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三角比難題
2014-05-27 7:15 am
回答 (2)
2014-05-27 9:12 pm
✔ 最佳答案
log (5x√20)= log 5 + (0.5) log 20
= log 5 + 0.5 log 2 + 0.5 log 10
(log 2 = 0.301, log 10 = 1, log 5 = log(10/2) = 1 - 0.301 = 0.699)
= 0.699 + 0.5x0.301 + 0.5x1
= 1.3495
2014-05-28 2:58 am
1, √20=4.472135955
2, ans x 5=22.36067977
3, log(ans=1.349485002
2, ans x 5=22.36067977
3, log(ans=1.349485002
收錄日期: 2021-04-23 23:46:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140526000051KK00169