Originally posted by Shoney at 2011-03-24 21:16:40:
跟我的不一样啊，第一个求导，分子是-ab，不是ab(b-a)

Originally posted by Shoney at 2011-03-24 06:17:06:
具体如附件所示，自己求得不知对不对，达人给个答案参考下，谢谢！
最后分别用dy/dt（第一个），dy/dx（第二个）表示


[eimg]30/0a/435677_1300918610_634.jpg[/e ...

Originally posted by cxy1010 at 2011-03-24 12:02:02:
（1）=[img]http://latex.codecogs.com/gif.latex? \frac{\mathrm{d&space;f(t)}&space;}{\mathrm{d}&space;t}=\frac{ab(b-a)}{[(a-b)y-b]^{2}}\frac{\mathrm{dy}&space;}{\mathrm{d}&sp ...