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u=xyz
Ux=yz
Uy=xz
Uz=xy
所以:
du=(yz)dx+(xz)dy+(xy)dz
U=x^(yz)
Ux=(yz)x^(yz-1)
Uy=(x^z)^y*ln(x^z)
Uz=(x^y)^z*ln(x^y)
du=[(yz)x^(yz-1)]dx+[z(x^z)^y*ln(x)]dy+[y*(x^y)^z*ln(x)]dz
Ux=yz
Uy=xz
Uz=xy
所以:
du=(yz)dx+(xz)dy+(xy)dz
U=x^(yz)
Ux=(yz)x^(yz-1)
Uy=(x^z)^y*ln(x^z)
Uz=(x^y)^z*ln(x^y)
du=[(yz)x^(yz-1)]dx+[z(x^z)^y*ln(x)]dy+[y*(x^y)^z*ln(x)]dz
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