设函数z=f(x,y)(xy≠0)满足f(xy,)=y2(x2-1),则dz=___________.

admin2019-06-06  67

问题 设函数z=f(x,y)(xy≠0)满足f(xy,)=y2(x2-1),则dz=___________.

选项

答案(2x-y)dx-xdy

解析 设xy=u,=v,有x2=,y2=uv.
f(u,v)=uv(-1)=u2-uv,即z=f(x,y)=x2-xy.
所以dz=(2x-y)dx-xdy.
转载请注明原文地址:https://jikaoti.com/ti/D4LRFFFM
0

最新回复(0)