设u(x)与v(x)在x都可导，关于导数的运算法则，下列公式错误的是（ ）．

A．[u(x)+v(x)]=u(x)+v(x)

B．[u(x)-v(x)]=u(x)v(x)+u(x)v(x)

C．[v(x)/u(x)]=[v(x)]^2/u(x)v(x)+u(x)v(x) D．[cu(x)]=cu(x)