Re: [微分] 一題微分
※ 引述《graydevils (why, or why not)》之銘言:
: xy
: let e +xy=7 , 則dy/dx=?
: 笨笨的想用移項...不過會微不出來
implicit differential.
xy
(y+xy')e + y + xy' = 0
dy/dx= - y/x
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