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【单选题】
设u(x,y,z)=(x/y)^z,则在点(1,2,3)处的du=()
A.
3/8 dx-dy-ln2dz
B.
1/8 dx-3/16 dy-1/8 ln2dz
C.
dx-3/16 dy-1/8 ln2dz
D.
3/8 dx-3/16 dy-1/8 ln2dz
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