maths(急問)

🎓 學業台教學

[匿名]

2010-04-24 1:19 am

p=log3,q=log5,以p,q表示
問題係log0.18
答案係:2p-q-1
我計唔到...識做嘅寫埋步驟,thz~~~

回答 (4)

lo824

2010-04-24 1:26 am

✔ 最佳答案

p = log 3
q = log 5
log 0.18
= log(18/100)
= log(9/50)
= log 9 - log 50 (Because log(A/B) = log A - log B)
= log (3^2) - log (5*10) (* means multiply)
= 2 log 3 - ( log 5 + log 10 ) (Because log(A*B) = log A + log B)
= 2 log 3 - log 5 - 1
= 2p - q - 1

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屈機王

2010-04-25 8:46 am

Let A = 10^x

Then X = log A

Log 的意思就是這樣

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