1. Simplify 7-i / -i and express the result in the form of a+bi
2 simplify 5i / 2+i and express the result in the form a+bi
F4 Maths (a+bi)
2009-10-15 1:31 am
回答 (1)
2009-10-15 1:38 am
✔ 最佳答案
1.) 7-i / -i = (7 / -i ) - (i / -i)
= ( 7i ) - (- 1)
=1 + 7i
2) 5i / (2+i)
= (5i)(2-i) / (2+i)(2-i)
= (10i + 5) / (4 + 1)
= 1 + 2i
2009-10-14 17:50:23 補充：
1) 7-i / -i
= (7 - i)(i) / (-i)(i)
= 7i + 1 / 1
= 1 + 7i
收錄日期: 2021-04-21 22:04:33
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https://hk.answers.yahoo.com/question/index?qid=20091014000051KK00787