设函数z=z(x,y)由方程x∧2z∧3+2y∧2z∧2-x∧2+y∧3=0所确定,求dz

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/14 11:26:15
设函数z=z(x,y)由方程x∧2z∧3+2y∧2z∧2-x∧2+y∧3=0所确定,求dz
xPJA~;/;.ZރX([ˡTjiB:Ab:{q+8Ftio?&+MgΆ{7z7f5yGn ~h3jseܮ-gQ|2ώe~U`nWwK@. 89?E$PЌb< SVAD1H#-"3oGŐ4{!d(@ɖe#m,*[:A3KYzS^\?+

设函数z=z(x,y)由方程x∧2z∧3+2y∧2z∧2-x∧2+y∧3=0所确定,求dz
设函数z=z(x,y)由方程x∧2z∧3+2y∧2z∧2-x∧2+y∧3=0所确定,求dz

设函数z=z(x,y)由方程x∧2z∧3+2y∧2z∧2-x∧2+y∧3=0所确定,求dz
两边对x求偏导:2xz^3+x^2*3z^2 Z'x+2y^2*2z*Z'x-2x=0,得:Z'x=(2x-2xz^3)/(3x^2z^2+4y^2z)
两边对y求偏导:x^2*3z^2*Z'y+4yz^2+2y^2*2z*Z'y+3y^2=0,得:Z'y=-(3y^2-4yz^2)/(3x^2z^2+4y^2z)
dz=Z'xdx+Z'ydy=(2x-2xz^3)/(3x^2z^2+4y^2z)dx-(3y^2-4yz^2)/(3x^2z^2+4y^2z)dy