作者woosD (woos)
看板Math
標題[中學] 1的開根號
時間Tue Aug 9 18:10:46 2011
原文描述
So, the basic problem is to calculate the nth roots of one. Now, in the real
domain, of course, the answer is, sometimes there's only one of these, one
itself, and sometimes there are two, depending on whether n is an even number
or an odd number.
想請問當中 there are two的意思(?)
附圖
n √(1)
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1F：→ hsnuyi :開n次方根 n為even時 答案可為兩種(two) +1和-1 08/09 18:31
2F：→ hsnuyi :n為odd時 只有一種 1 (在實數系時) 08/09 18:32
3F：→ doublewhi :不過這種開根號定義一般是複數下用吧? 08/09 21:25