1设 z=(3x+y)^(x+2y), 求ex/ax,ex/ey 及dz,
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解:lnz=(x+2y)*ln(3x+y)
(1/z)*∂z/∂x=ln(3x+y)+(x+2y)*3/(3x+y)
∂z/∂x=z*ln(3x+y)+z(3x+6y)/(3x+y)
(1/z)*∂z/∂y=2*ln(3x+y)+(x+2y)*1/(3x+y)
∂z/∂y=2z*ln(3x+y)+z(x+2y)/(3x+y)
dz=[z*ln(3x+y)+z(3x+6y)/(3x+y)]dx+[2z*ln(3x+y)+z(x+2y)/(3x+y)]dy
(1/z)*∂z/∂x=ln(3x+y)+(x+2y)*3/(3x+y)
∂z/∂x=z*ln(3x+y)+z(3x+6y)/(3x+y)
(1/z)*∂z/∂y=2*ln(3x+y)+(x+2y)*1/(3x+y)
∂z/∂y=2z*ln(3x+y)+z(x+2y)/(3x+y)
dz=[z*ln(3x+y)+z(3x+6y)/(3x+y)]dx+[2z*ln(3x+y)+z(x+2y)/(3x+y)]dy
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