第1806题：导数的运算法测
设 u,v,wu,v,wu,v,w 是关于 xxx 的函数，CCC 为常数，以下简写的求导法则，错误的有( ).
A. (Cv)′=Cv′(Cv)'=Cv'(Cv)′=Cv′
B. (u+v)′=u′+v′ (u+v)'=u'+v'(u+v)′=u′+v′
C. (uv)′=u′v′(uv)'=u'v'(uv)′=u′v′
D. (uvw)=u′vw+uv′w+uvw′(uvw)=u'vw+uv'w+uvw'(uvw)=u′vw+uv′w+uvw′
E. (uv)′=u′v+v′uv2 \Big( \dfrac{u}{v} \Big )'=\dfrac{u'v+v'u}{v^2}(vu)′=v2u′v+v′u
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