怎样用乘积求导、复合函数求导公式证明商求导公式?已知乘积求导[u(x)v(x)]'=u(x)'v(x)+u(x)v(x)';复合函数求导f[v(x)]'=f(u)'v(x)' (u=v(x))求证:[u(x)/v(x)]'=?别给我商求导公式用差商的证明说明一下已

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怎样用乘积求导、复合函数求导公式证明商求导公式?已知乘积求导[u(x)v(x)]'=u(x)'v(x)+u(x)v(x)';复合函数求导f[v(x)]'=f(u)'v(x)' (u=v(x))求证:[u(x)/v(x)]'=?别给我商求导公式用差商的证明说明一下已
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怎样用乘积求导、复合函数求导公式证明商求导公式?已知乘积求导[u(x)v(x)]'=u(x)'v(x)+u(x)v(x)';复合函数求导f[v(x)]'=f(u)'v(x)' (u=v(x))求证:[u(x)/v(x)]'=?别给我商求导公式用差商的证明说明一下已
怎样用乘积求导、复合函数求导公式证明商求导公式?
已知乘积求导[u(x)v(x)]'=u(x)'v(x)+u(x)v(x)';复合函数求导f[v(x)]'=f(u)'v(x)' (u=v(x))
求证:[u(x)/v(x)]'=?
别给我商求导公式用差商的证明
说明一下已知里的u,v,f和求证里的u,v没有关系

怎样用乘积求导、复合函数求导公式证明商求导公式?已知乘积求导[u(x)v(x)]'=u(x)'v(x)+u(x)v(x)';复合函数求导f[v(x)]'=f(u)'v(x)' (u=v(x))求证:[u(x)/v(x)]'=?别给我商求导公式用差商的证明说明一下已
设FX,GX
(F/G)'=(F(1/G))'=F'*(1/G)+F*(-1/G^2)*G'
=(F'G-FG')/(G^2)

[u(x)/v(x)]'
={u(x)·[1/v(x)]}'
(乘积求导)
=u(x)'·[1/v(x)]+u(x)·[1/v(x)]'
([1/v(x)]'用复合函数求导,f(x)=1/x,1/v(x)=f[v(x)])
=u(x)'·[1/v(x)]+u(x)·[v(x)']/[v(x)·v(x)]
(通分,分母变成[v(x)·v(x)])
=[u(x)'·v(x)+u(x)·v(x)']/[v(x)·v(x)]