http://www.flickr.com/photos/69461699@N03/6314585025/
answer: a = - 0.4 b = 2
收錄日期: 2021-05-01 00:56:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111105070741AABYPpv