中4數學(十萬火急)
回答 (1)
2009-09-15 7:42 pm
✔ 最佳答案
2i + (3 + i)z = 5 - 8i(3 + i)z = 5 - 8i - 2i = 5(1 - 2i)
z = 5(1 - 2i)/(3 + i)
z = 5(1 - 2i)(3 - i) / [(3 + i)(3 - i)]
= 5[3 - 7i + 2i2] / (32 - i2)
= 5(3 - 7i - 2) / (9 + 1)
= 1/2 - 7/2 i
2009-09-15 11:42:44 補充：
i^2 = -1
參考: Physics king
收錄日期: 2021-04-19 15:20:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090915000051KK00492