數學移項一問題..~~
求b
a+bi / a-bi =i
b [( a+i) / (a-i ) ] =i
b= 1
找錯處
回答 (3)
✔ 最佳答案
(a + bi)/(a - bi) = i
a + bi = ai + b
(a - b) = (a - b)i
So, a = b
a+bi / a-bi =i
a+bi=i(a-bi)
a+bi=ai-bi^2
bi+bi^2=ai-a
b(i+i^2)=ai-a
b=(ai-a)/(i+i^2)
(a+bi)/(a-bi)
=[b(a/b+i)/b(a/b-i)]
=(a/b+i)/(a/b-i)
≠b[(a+i)/(a-i)]
[(a+i)/(a-i)]
=(a+i)²/(a-1)(a+1)
=(a²+2ai-1)/(a²-1)
≠i
收錄日期: 2021-04-13 18:38:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120415000051KK00116
檢視 Wayback Machine 備份