(a +bi )/ (c+ di )
=[(a+ bi ) / (c + di ) ]* [ (c - di ) / (c - di) ]
= [(ac +bd ) / (c^2 + d^2 )] + [ ( bc -ad ) / c^2 + d^2 )] i
最後一行的( ac + bd ) 和 ( bc - ad ) 係點泥呀
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複數 -----(a +bi )/ (c+ di )
2011-05-15 2:52 pm
回答 (1)
2011-05-15 4:16 pm
✔ 最佳答案
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最後一行的( ac + bd ) 和 ( bc - ad ) is come from the expansion of (a+bi)(c-di)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110515000051KK00175