題目如下:
1.(+18)+(+123)
2.(+47)-(-14)
3.71-(+23)
4.(-17)-(-35)
5.(-45)+(-6)
6.(-83)+(+27)
收錄日期: 2021-04-16 11:38:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100914000051KK01007