高数隐函数求导
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e^z=xyz
e^z·∂z/∂x=yz+xy∂z/∂x→∂z/∂x=yz/(e^z-xy)
∂²z/∂敬或x∂y=[(z+y∂亮信伍z/∂x)(e^z-xy)-yz·(e^z·∂z/坦绝∂x-x)]/(e^z-xy)²
=[(z+y·yz/(e^z-xy))(e^z-xy)-yz·(e^z·yz/(e^z-xy)-x)]/(e^z-xy)²
=[z·(e^z-xy)²+y²z(e^z-xy)-y²z²e^z+xyz(e^z-xy)]/(e^z-xy)³
e^z·∂z/∂x=yz+xy∂z/∂x→∂z/∂x=yz/(e^z-xy)
∂²z/∂敬或x∂y=[(z+y∂亮信伍z/∂x)(e^z-xy)-yz·(e^z·∂z/坦绝∂x-x)]/(e^z-xy)²
=[(z+y·yz/(e^z-xy))(e^z-xy)-yz·(e^z·yz/(e^z-xy)-x)]/(e^z-xy)²
=[z·(e^z-xy)²+y²z(e^z-xy)-y²z²e^z+xyz(e^z-xy)]/(e^z-xy)³
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