Irrational number

2012-02-29 6:44 am

回答 (3)

2012-03-07 8:15 pm
✔ 最佳答案
NO!!!

set a = sqrt(b), n = 2
(a + sqrt(b))^n = 4b !!! which is rational
參考: R => real number
2012-02-29 11:04 pm
But the question does not mention whether 'a' is rational or irrational,
so if a = 2√ b and b = 3, n = 4, then
(a + √ b)^n = (2√ 3 + √ 3)^4 = 27
which is rational.
2012-02-29 6:47 pm
你好哦:

Yes!

irrational number 就是無理數

(無理數+任何有理數)的n次方 必定還是 無理數!

參考資料如下:

http://www.mcu.edu.tw/department/management/stat/ch_web/etea/Calculus-3-net/23.pdf

http://zh.wikipedia.org/wiki/%E7%84%A1%E7%90%86%E6%95%B8
這網址中的性質...
有提到:
無理數加減有理數後..必是無理數
參考: 網路


收錄日期: 2021-04-13 18:34:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120228000051KK00793

檢視 Wayback Machine 備份