设方程ez=1+xz+x2+y2确定隐函数z=z(x,y),求dz与z"xy。
举一反三
- 设\(z = z\left( {x,y} \right)\)是由方程\({z^3}{\rm{ + }}3xyz - 3\sin xy = 1\)确定的隐函数,则\( { { \partial z} \over {\partial y}}=\)( ) A: \( { { y\left( {\cos xy - z} \right)} \over { { z^2} + xy}}\) B: \( { { y\left( {z - \cos xy} \right)} \over { { z^2} + xy}}\) C: \( { { x\left( {\cos xy - z} \right)} \over { { z^2} + xy}}\) D: \( { { x\left( {z - \cos xy} \right)} \over { { z^2} + xy}}\)
- 设\(z = z\left( {x,y} \right)\)是由方程\(2{x^2} + {y^2} + {z^2} - 2z = 0\)确定的隐函数,则\( { { \partial z} \over {\partial x}}=\)( )。 A: \( { { 2x} \over {1 - z}}\) B: \( { { 2x} \over {z - 1}}\) C: \({z \over {1 - y}}\) D: \({z \over {y - 1}}\)
- 设方程\(\sin z - xyz = 0\)确定函数\(z=z(x,y)\),则\( { { \partial z} \over {\partial y}}=\)( )。 A: \( { { xz} \over {xy+cos z }}\) B: \(- { { xz} \over {xy+cos z }}\) C: \(- { { xz} \over {\cos z - xy}}\) D: \( { { xz} \over {\cos z - xy}}\)
- 设函数z=z(x,y)是由方程e^z-xyz=0所确定的隐函数,求əz/əy
- 9. 已知函数$z=z(x,y)$由${{z}^{3}}-3xyz={{a}^{3}}$确定,则$\frac{{{\partial }^{2}}z}{\partial x\partial y}=$( ) A: $\frac{z({{z}^{4}}-2xy{{z}^{2}}-{{x}^{2}}{{y}^{2}})}{{{({{z}^{2}}-xy)}^{3}}}$ B: $\frac{z({{z}^{4}}-2xy{{z}^{2}}-xy)}{{{({{z}^{2}}-xy)}^{2}}}$ C: $\frac{z({{z}^{3}}-2xyz-{{x}^{2}}{{y}^{2}})}{{{({{z}^{2}}-xy)}^{3}}}$ D: $\frac{z({{z}^{3}}-2xy{{z}^{2}}-{{x}^{2}}y)}{{{({{z}^{2}}-xy)}^{3}}}$