1....^x+2-3^x=72
2....^2n+1+7^(2n)/2(3^2n+1)
呢幾題點計
2007-09-17 2:44 am
回答 (1)
2007-09-17 5:35 am
✔ 最佳答案
3^x+2-3^x=72(3^2)(3^x) - 3^x = 72
3^x (9 - 1) = 72
3^x = 9
3^x = 3^2
x = 2
第二題唔明你問咩...
參考: myself
收錄日期: 2021-04-14 18:50:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070916000051KK04062