• 2022-07-25
    设\(w = f(x + y + z,xyz)\),其中\(f\)有连续偏导数,则\( { { {\partial}w} \over {\partial {x}}} =\)
    A: \({f'_1} + yz{f'_2}\)
    B: \(x{f'_1} + yz{f'_2}\)
    C: \(yz{f'_1} +x{f'_2}\)
    D: \({f'_1} +{f'_2}\)