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设 $x=\frac{1}{u}+\frac{1}{v}, y=\frac{1}{u^2}+\frac{1}{v^2}, z=\frac{1}{u^3}+\frac{1}{v^3}+ e ^x$, 求 $\frac{\partial z}{\partial y}, \frac{\partial z}{\partial v}$.
                        
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