u'/v-uv^(-2)*v'化简得u'v/v^2-uv'/v^2//怎么变出来的/v^2?
问题描述:
u'/v-uv^(-2)*v'化简得u'v/v^2-uv'/v^2//怎么变出来的/v^2?
答
u'/v-uv^(-2)*v'
=u'*v/v^2-u*v'/v^2
=(u'*v-u*v')/v^2