设u=f(xyz),则<img src='https://img2.soutiyun.com/latex/latex.action' />=( )

A.<img src='https://img2.soutiyun.com/latex/latex.action' /> B.f<sub>x</sub>(xyz) C.f&39;(xuz)yz D.<img src='https://img2.soutiyun.com/latex/latex.action' />

时间:2023-08-21 17:05:25

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