點樣用log計進制?

👨🏻‍🏫 學術台數學

Tommy T.K. Lau

2006-12-13 6:19 am

我記得我同學可以唔知點樣 log a ÷log b 就可以將唔知邊個數由a進制轉做b進制....
當然我 log a ÷log b E條式係一定錯啦.....
所以想問下有冇人可以幫下我...
只需要打出一條成功轉換的log式比我試下成功就得....
唔該哂^^...

更新1:

To : stenleyforreg 冇錯啦...正是我想知ge野.. 我會盡快選出最佳回答... 無奈要等24小時=.=........ 唔該哂兩位....多謝

回答 (2)

千葉星佑

2006-12-13 6:53 am

✔ 最佳答案

Let A 做你想要既進制既數(即係如果你要2進制A就係2)
Let B 做你想要拎黎log既數(即係如果你想log 8,個base係2既話B就係8)

Log B ÷ Log A

拎個數黎睇
Put A = 2, B=8
Answer應該係3
因為8係2既3次方

Log 8÷Log2

=3Log2÷Log2

=3

參考: Me

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用戶117958

2006-12-13 8:01 pm

log (base b) X = ln a / ln b * log (base a) X

or

log (base b) X = log (base a) X / log (base a) b

u want try it in excel...

參考: http://oakroadsystems.com/math/loglaws.htm

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