来自罗安安的问题
导数运算//(u*1/v)'怎么化简成u'*1/v+u*(1/v)'?(u/v)'=(u*1/v)'=u'*1/v+u*(1/v)'=u'*1/v+u*(-1/v²)*v'=u'/v-u*v'/v²=(u'*v-u*v')/v²
导数运算//(u*1/v)'怎么化简成u'*1/v+u*(1/v)'?
(u/v)'=(u*1/v)'
=u'*1/v+u*(1/v)'
=u'*1/v+u*(-1/v²)*v'
=u'/v-u*v'/v²
=(u'*v-u*v')/v²
