Mathematics
Senior High
請問藍色字的算式是怎麼來的
二、進階題
9 已知f(x)=loggx,且f(a)-f(b)=6,求ㄓㄢ 的值。
log 3 a
= 6
log J
b
燦
log√ ab= 6
- 6 a
冊甘價社臨开右二種可能的結果,甘發生的機率分別為
1
Answers
先看定義,10^loga=a(前面的log是常用對數,以10為底),log√3為底(a-b)=6,=2邊在底下放√3,√3^log√3為底(a-b)=√3^6,(√3log√3為底a)÷(log√3為底b)=√3^6,a÷b=√3^6
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