已知方程x2+y2-4y+z2=3确定函数z=z(x,y),求∂z/∂x和∂2z/∂x2.
∵2x+2z(z/x)=0 ∴∂z/∂x=-(x/z) 从而∂2z/∂x2=-z-x(∂z/∂x)/z2=(x2+z2)/z3.
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