dy,先，生的門，先生們 這大達 哲現在就海dx ?
回答 (2)
2020-08-03 8:54 pm
dy/dx = x/y
則
(d/dx)^2 y = d/dx(dy/dx)
= d/dx (x/y)
= [y (d/dx x) - x (d/dx y)]/y^2
= (y - x dy/dx)/y^2
= (y - x x/y)/y^2
= (y^2-x^2)/y^3
則
(d/dx)^2 y = d/dx(dy/dx)
= d/dx (x/y)
= [y (d/dx x) - x (d/dx y)]/y^2
= (y - x dy/dx)/y^2
= (y - x x/y)/y^2
= (y^2-x^2)/y^3
2020-08-03 8:23 pm
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收錄日期: 2021-04-11 23:11:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200803120242AAPEmwR