let f(x,y,z) = distance^2
圖片參考:http://img217.imageshack.us/img217/4636/lagrange.jpg
收錄日期: 2021-04-26 14:01:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101209000051KK01140