令D=(x)•(d/dX)請問為什麼
(D^2)y=(x^2) • [(d^2)y / d(x^2)] + x•(dy/dX)
求詳解怎麼算
收錄日期: 2021-04-30 19:15:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20141125000015KK02785