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题目表达不明确!
若是 u=x^y*z^2 ,
则 u'<x>=y*u^(y-1)z^2, u'<y>=x^y*lnx*z^2, u'<z>=2zx^y,
du=[yu^(y-1)z^2]dx+(x^y*lnx*z^2)dy+(2zx^y)dz.
若是 u=x^(y*z^2) ,
则 u'<x>=yz^2*x^(y*z^2-1), u'<y>=z^2*x^(y*z^2)lnx, u'<z>=2yz*x^(y*z^2)lnx,
du=[yz^2*x^(y*z^2-1)]dx+[z^2*x^(y*z^2)lnx]dy+[2yz*x^(y*z^2)lnx]dz..
若是 u=x^y*z^2 ,
则 u'<x>=y*u^(y-1)z^2, u'<y>=x^y*lnx*z^2, u'<z>=2zx^y,
du=[yu^(y-1)z^2]dx+(x^y*lnx*z^2)dy+(2zx^y)dz.
若是 u=x^(y*z^2) ,
则 u'<x>=yz^2*x^(y*z^2-1), u'<y>=z^2*x^(y*z^2)lnx, u'<z>=2yz*x^(y*z^2)lnx,
du=[yz^2*x^(y*z^2-1)]dx+[z^2*x^(y*z^2)lnx]dy+[2yz*x^(y*z^2)lnx]dz..
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题目是u=x∧(y+z2)
追答
请表达清楚啊!
若是 u=x^(y+z^2) ,
则 u'=(y+z^2)x^(y*+z^2-1), u'=x^(y+z^2)lnx, u'=2z*x^(y+z^2)lnx,
du=[(y+z^2)x^(y*+z^2-1)]dx+[x^(y+z^2)lnx]dy+[2z*x^(y+z^2)lnx]dz..
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