香港寵物小精靈村落 論壇

標題: 一題超出能力範圍的方程式...... [打印本頁]

---

作者: secret    時間: 2/5/2005 12:18 PM
標題: 一題超出能力範圍的方程式......
題目:
   
X(1+20%)^n=20000

請大家教教我...
(其實這是一條方程式應用題，老師說可以試數，但我還是想學正式的計算方法...)

---

作者: 細薯    時間: 2/5/2005 12:41 PM

Originally posted by secret at 2005-5-2 12:18 PM:
X(1+20%)^n=20000

X is a variable??

---

作者: secret    時間: 2/5/2005 01:14 PM

Originally posted by smallpotato226 at 2005-5-2 12:41 PM:

X is a variable??

Sorry,I made a mistake.The equation should be like that:

8000(1+20%)^n=20000

---

作者: xiirr    時間: 2/5/2005 01:29 PM
(1+20%)^n=2.5
n log1.2=log2.5
n=log2.5 /log1.2
計算機.

---

作者: secret    時間: 2/5/2005 01:51 PM

Originally posted by xiirr at 2005-5-2 01:29 PM:
(1+20%)^n=2.5
n log1.2=log2.5
n=log2.5 /log1.2
計算機.

但是....我的計算機沒有這項功能...(廢機...)

---

作者: Echo21    時間: 2/5/2005 02:10 PM
8000(1 + 20%)^n=20000
9600^n = 20000
n log 9600 = log 20000
n = log 20000 / log 9600
n = 1.080044463 (10 sig. fig.)//

---

作者: JOHNLAM17    時間: 2/5/2005 05:44 PM

Originally posted by secret at 2005-5-2 12:18 PM:
題目:
   
X(1+20%)^n=20000

請大家教教我...
(其實這是一條方程式應用題，老師說可以試數，但我還是想學正式的計算方法...)

我想問
你讀幾年班

---

作者: oscar    時間: 2/5/2005 06:38 PM

Originally posted by Echo21 at 2005-5-2 14:10:
8000(1 + 20%)^n=20000
9600^n = 20000
n log 9600 = log 20000
n = log 20000 / log 9600
n = 1.080044463 (10 sig. fig.)//

haha！你錯了！
你告訴我：2(3)^2是不是等於6^2?

---

作者: 幻藍    時間: 2/5/2005 07:49 PM

Originally posted by oscar at 2005-5-2 06:38 PM:

haha！你錯了！
你告訴我：2(3)^2是不是等於6^2?

2(3)^2=2(9)

am I right?

---

作者: JOHNLAM17    時間: 2/5/2005 07:49 PM

Originally posted by secret at 2005-5-2 01:14 PM:


Sorry,I made a mistake.The equation should be like that:

8000(1+20%)^n=20000

8000 * 1.2^n = 20000
1.2^n = 20000/8000
1.2^n = 2.5
n log 1.2 = log 2.5
n = 5.03 (corr. to 2 d.p.)

---

作者: oscar    時間: 2/5/2005 08:38 PM

Originally posted by 可愛的兔兒 at 2005-5-2 19:49:

2(3)^2=2(9)

am I right?

yes~Echo錯了~

---

作者: 細薯    時間: 2/5/2005 08:52 PM

Originally posted by oscar at 2005-5-2 08:38 PM:

yes~Echo錯了~

Echo未教log嗎......?
定係記錯......==

---

作者: JOHNLAM17    時間: 2/5/2005 09:29 PM

Originally posted by smallpotato226 at 2005-5-2 08:52 PM:

Echo未教log嗎......?
定係記錯......==

我都未教log ar..
其實而家中三maths書有冇log教

---

作者: oscar    時間: 2/5/2005 10:13 PM

Originally posted by smallpotato226 at 2005-5-2 20:52:

Echo未教log嗎......?
定係記錯......==

唔係....佢錯既地方係第1到2個step

---

作者: Echo21    時間: 2/5/2005 10:38 PM
當了[8000(1 + 20%)]^n......

---

作者: oscar    時間: 2/5/2005 11:29 PM

Originally posted by Echo21 at 2005-5-2 22:38:
當了[8000(1 + 20%)]^n......

在任何情況下都只會當你錯~沒情講！

---

作者: 細薯    時間: 3/5/2005 05:26 PM

Originally posted by JOHNLAM17 at 2005-5-2 09:29 PM:

我都未教log ar..
其實而家中三maths書有冇log教

log 在我校
form 4 教

---

作者: secret    時間: 3/5/2005 06:07 PM

Originally posted by JOHNLAM17 at 2005-5-2 05:44 PM:

我想問
你讀幾年班

哈哈....我是中一生...

---

作者: Echo21    時間: 3/5/2005 07:14 PM

Originally posted by oscar at 2005-5-2 23:29:

在任何情況下都只會當你錯~沒情講！

考試就是這樣殘酷
死就死
生就生......

---

作者: oscar    時間: 3/5/2005 07:20 PM

Originally posted by Echo21 at 2005-5-3 19:14:

考試就是這樣殘酷
死就死
生就生......

會考的策略就是盡可能不讓考官扣任何一分，就可以拿高分~

---

作者: Apple798    時間: 22/7/2005 02:58 PM
?????????

---

作者: 耿鬼孔明    時間: 24/7/2005 11:31 PM
^ is 幾多次方???
如果係的話:
這是一條計算複利息(compound interest)的式(中二,三會教到)
而n是解幾多期,所以理應是整數
計算複利息喎,當然是應用吧


如果唔係就另請高明了

[ Last edited by 耿鬼孔明 on 2005-7-25 at 08:40 PM ]

---

歡迎光臨 香港寵物小精靈村落 論壇 (https://proxy.archiver.hkpnve.pokebeacon.com/)

Powered by Discuz! X3.2