http://tinypic.com/r/kdx44y/5
I think this is the same with f(x). I'm not sure. Still, i don't know how to do this.
Thanks in advance!
收錄日期: 2021-04-20 20:34:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130619014938AAqMXzG