我的運算過程是
4x-7-x+9
=4x-x-7+9
=3x-16
是哪錯了?
收錄日期: 2021-05-04 01:07:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20191211150536AAgXvom