1 1
-1 -2
x
5^k 0
0 3^k
x
2 1
-1 -1
ans is
2.5^k-3^k.......... 5^k-3^k
2.3^k-2.5^k........ 2.3^k-5^k
why??
list the step pls
收錄日期: 2021-04-25 16:59:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071125000051KK03116