can you solve this question? thanks~
http://i649.photobucket.com/albums/uu213/cyn001/aa2fe40d.jpg
complex number問題
2009-11-08 3:25 am
回答 (1)
2009-11-08 3:59 am
✔ 最佳答案
(a) z(1+i)^4=(a+3i)^2|z(1+i)^4|=|(a+3i)^2|
Since |(1+i)|=√2
We have 3*4=a^2+9=>a=-√3
(b) (1+I)^4=4[cosπ+isinπ]=-4
(-√3+3i)^2=12[cos5π/3+isin5π/3]
So z=-3[cos5π/3+isin5π/3] which shows that the required smallest number is n=3
收錄日期: 2021-04-26 14:01:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091107000051KK01362