设xy+lnx-lny=o,则dy/dx=
人气:164 ℃ 时间:2020-04-15 07:07:16
解答
xy+lnx-lny=0
两边对x求导
(y+xy')+1/x-y'/y=0
y+1+(x-1/y)y'=0
y'=(y+1)/(1/y-x)
y'=y(y+1)/(1-xy)
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