更新1:
its wrong the answear in the back of the book is minus 4 not minus 2.16
its wrong the answear in the back of the book is minus 4 not minus 2.16
收錄日期: 2021-05-01 12:48:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091025000325AA9oUNZ