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梯度=(∂;u/∂;x,∂;u/∂;y,∂;u/∂;z) ∂;u/∂;x=1/(x+y+z),∂;u/∂;y=1/(x+y+z),∂;u/∂;z=1/(x+y+z), u點M(1,2,-2)處的梯度:(1,1,1).
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