點解負次方o既數成舊擺落分母會變做正次方o既數
回答 (2)
2015-03-18 7:33 am
✔ 最佳答案
假設 n > 0a⁻ⁿ
= a⁰⁻ⁿ ...... (因為 -n = 0 - n)
= a⁰ / aⁿ...... (因為 aᵝ⁻ᵞ = aᵝ /aᵞ)
= 1 / aⁿ ...... (因為 a⁰ = 1)
2015-03-18 4:25 am
Suppose n > 0
(1/a)⁽⁻ⁿ⁾
=(a⁻¹)⁽⁻ⁿ⁾
=a⁽⁻¹⁾⁽⁻ⁿ⁾
=aⁿ
(1/a)⁽⁻ⁿ⁾
=(a⁻¹)⁽⁻ⁿ⁾
=a⁽⁻¹⁾⁽⁻ⁿ⁾
=aⁿ
收錄日期: 2021-04-15 18:46:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150317000051KK00068