Maths

2007-02-10 6:32 am
將0.989898989898......

化為分數(不要用方程)
更新1:

要過程

回答 (6)

2007-02-11 12:51 am
✔ 最佳答案
0.989898989898.....
=0.98......
=98/99
2007-02-11 7:21 am
0.989898.....

=98/99
參考: Myself
2007-02-10 6:42 am
0.abcdefg......zabcde........(設a至z有n個數字)
如要化為分數應是什麼?
將0.abcdefg......zabcde........設為(1)
(1)x10^n:abcde......z.abcd......(2)
(2)-(1):abcde......z=(10^n -1)0.abcdefg......zabcdef......
所以0.abcdef......zabcdef......=(abcdef......z)/(10^n-1)
在0.98989898的例子中
n=2
所以0.98989898......=98/(10^2-1)=98/99
以上所用是將問題廣義化

2007-02-11 15:56:35 補充:
所謂過程......
2007-02-10 6:35 am
98
----
99


I hope I can help you
參考: 經常用計算機
2007-02-10 6:35 am
989898989898
---------------------
1000000000000
2007-02-10 6:35 am
 9
---
100


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