求隐函数导数用dy/dx谢谢了,

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求隐函数导数用dy/dx谢谢了,
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求隐函数导数用dy/dx谢谢了,
求隐函数导数用dy/dx谢谢了,

 

求隐函数导数用dy/dx谢谢了,
两边同时对x求导得到
y+x·dy/dx+1/y·dy/dx=0
(xy+1)·dy/dx=-y的平方
dy/dx=-y的平方/(xy+1)

xy+lny=3
y+xdy/dx+1/y.dy/dx=0
(x+l/y)dy/dx=-y
dy/dx=-y^2/(xy+1)