3. 已知實數a(a=0.12457…)的小數點後第n位的數字等於n x (2)^(1/2)的整數部分之首位數的數字。試證a是一個無理數。 (六分)高中 回應 isomorphism Re: 環球城市數學競賽2006秋季賽高中組高級卷第3題 2007-02-02 20:55 Hint: Assume to the contrary that 'a' is periodic. Then consider certain terms of 'a' and derive a contradiction.
isomorphism Re: 環球城市數學競賽2006秋季賽高中組高級卷第3題 2007-02-02 20:55 Hint: Assume to the contrary that 'a' is periodic. Then consider certain terms of 'a' and derive a contradiction.
回應
isomorphism
Re: 環球城市數學競賽2006秋季賽高中組高級卷第3題
2007-02-02 20:55