求方程组dx/(x+y)=dy/(x-y)=dz / (y^2-2xy-x^2)的通积分
求方程组dx/(x+y)=dy/(x-y)=dz / (y^2-2xy-x^2)的通积分
求方程组dx/y^2+z^2-x^2=dy/-2xy=dz / -2xz的通解
设Z=f(x^2 +y,2xy),求dz/dx和dz/dy
求由方程组x+y+z=0;x^2+y^2+z^2=1所确定的函数的倒数dx/dz,dy/dz
微分方程(首次积分)已知dx/(e^x+z)=dy/(e^y+z)=dz/(z^2-e^(x+y)),求x,y,z的关系
求方程组dx/dt=2x-y+z ,dy/dt=x+2y-z ,dz/dt=x-y+2z的通解
设z=u^2cosv^2,u=x+y,v=xy,求dz/dx,dz/dy.
设有方程x+y^2+z^2=2z,求dz/dx dz/dy
z=(2y+7)^2 * ln(x^3+2) 求dz/dx 和 dz/dy
若z=e^(x^2+y^3),求dz/dx,dz/dy
设二元函数 z=u^2,u=x+y v=x-y ,求dz/dx,dz/dy
x^2+xy+y^3=1,求dy/dx