睇pure maths書時,有D step skip 左,又唔知點計...
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pure maths_轉項
2010-09-26 7:29 am
回答 (1)
2010-09-26 8:20 am
✔ 最佳答案
(ux+1)^2=x^2+x+1(ux)^2+2ux=x^2+x
xu^2+2u=x+1
x(u^2-1)=1-2u
x=(1-2u)/(u^2-1)
參考: myself
收錄日期: 2021-04-23 23:12:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100925000051KK01908