我想要過程,為何會多了xy
(x^-1 - y^-1)^-1
答案是:xy/y-x
thank you^^
指數數學題
2008-05-24 8:45 pm
回答 (2)
2008-05-24 9:18 pm
✔ 最佳答案
(x^-1-y^-1)^-1首先入面要轉換成分數
然後通分母
得出(x-y)/xy
然後因為負一次方, 所以分子分母掉轉
=[(1/x)-(1/y)]^-1
=[(x-y)/xy]^-1
=1/[(x-y)/xy]
=xy/x-y
2008-05-24 8:54 pm
(x^-1-y^-1)^-1
=[(1/x)-(1/y)]^-1
=[(x-y)/xy]^-1
=1/[(x-y)/xy]
=xy/x-y
Hope i can help you.
=[(1/x)-(1/y)]^-1
=[(x-y)/xy]^-1
=1/[(x-y)/xy]
=xy/x-y
Hope i can help you.
收錄日期: 2021-04-23 17:56:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080524000051KK01128