1. 2^n+1/8^n
2. 3^n+1 -3^n-1/2*3^n
3. (x^ -1y^2)^2(xy^ -1)^-2/x^ -1y^-1
希望睇得明...
收錄日期: 2021-04-12 20:19:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070106000051KK02506