logarithm高手來!

2007-02-24 6:39 am
Without using a calculator, find the values of the following.

10^(3log3)

回答 (4)

2007-02-24 6:53 am
✔ 最佳答案
Remember this formula: A log B = log (B^A)

3 log 3 = log (3^3) = log 27

so 10^ (3log3) = 10^(log27) = 27

2007-02-24 09:51:44 補充:
By default, 如果 log 後面無寫 base number, 咁就會當 base number 係 10所以 if A = log B, then B = 10^A, 呢個就係指數及對數之間的關係又或者如果你真係唔明, 可以用返 (if A = log B, then B = 10^A) 去計算.Let B = 10^(log27), then A = log27, because A = log B, so B = 27.由此可知 10^(log27) = 27, 呢個算法係唔需要使用計算機的
2007-02-24 7:24 am
Let 10^(3lg3)=X
then 10^(lg27)=X
lg X =lg 27
so X=27

其實過程係咁,明白了嗎?

2007-02-23 23:26:07 補充:
Let 10^(3lg3)=Xthen 10^(lg27)=X lg X =lg 27  <---指數化對數so X=27
2007-02-24 7:14 am
10^(3log3)
=10^(log3^3)
=10^(log27)
=27
每逢個次方係log, 而個log 0既base係同下面個數字一樣(個base係10 0既時候係唔洗寫出黎架, 可以係其他數字, 咁就要寫出黎喇!), 咁個答案就係log之後0個個數喇!
呢個係rule黎架!!
即係話呢個case, 「10」0既log27次方, 而今次係一個base 「10」 0既log, 大家都係10, 所以個答案就係log「27」個27喇!!

2007-02-23 23:16:01 補充:
3log3=log3^3因為log前0既數字係可以調上去做log後0既數字0既次方架!!
2007-02-24 6:54 am
10^(3㏒3)
=10^(㏒9)
=10^x同㏒相底消
=9

2007-02-23 22:55:31 補充:
10^(3㏒3) =10^(㏒27)=10^x同㏒相底消=27
參考: king


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