複數 -----(a +bi )/ (c+ di )

2011-05-15 2:52 pm
(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

回答 (1)

2011-05-15 4:16 pm
✔ 最佳答案

圖片參考:http://imgcld.yimg.com/8/n/HA00361383/o/701105150017513873438420.jpg

最後一行的( ac + bd ) 和 ( bc - ad ) is come from the expansion of (a+bi)(c-di)


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