求z=(x^2+y^2+z^2)^2 所围成的立体体积 公式和计算过程都要……thanks啊

已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z x+2y=3x+2z=4y+z 求x:y:z (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z 求Y(Z)=Z(Z+2)/(3Z-7)(Z+1)的z反变换 设函数z=(x,y)由方程x^2+z^2=2ye^z所确定,求dz 设函数Z=Z(X,Y) 由方程XY=e^z-z所确定的隐函数,求a^2z/axay 求方程2x^2+2y^2+z^2+8xz-z+8=0所确定的隐函数z=z(x,y)的极值. 设函数z=z(x,y)由方程x^2z+2y^2z^2-xy=0所确定,求dz. 偏导数数学题设z=(x,y) 是由z+e^z=xy所确定的二元函数,求σ2z/σxσy 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 设函数z=z(x,y),由方程z=e^(2x-3z)+2y确定,求∂z/∂x,∂z/∂y x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知X.Y.Z满足方程组,X+y-Z=6y+z-x=2z+x-y=0求X.Y.Z的值