左边=(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谁啥u‘*1要多乘以个1？？？1/v采纳吧=u'*1/v+u*(-1/v²)*v'//最后问一句-1/v^2是根据什么算出来的?