知道的回答下,x+y+z=0,x^2 + y^2 +z^2 = 1求：dy/dx,dz/dx

知道的回答下,x+y+z=0,x^2 + y^2 +z^2 = 1求：dy/dx,dz/dx 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-z）^2+(x+z-4)^2=-|z+x-5|,那么x-3y+2z的值是因为不知道回答的人回答的怎样或有没有人回答,我就先不予以分,不过,注：是（x+y-z）^2,而不是（x+y+z）^2. 已知x>0,y>0,z>0,x(x+y+z)+yz=4-2*根号下3,求2x+y+z的最小值 化简:(2x-y-z)/(x-y)(x-z)+(2y-z-x)/(y-z)(y-x)+(2z-x-y)/(z-x)(z-y)化简:(2x-y-z)/(x-y)(x-z)+(2y-z-x)/(y-z)(y-x)+(2z-x-y)/(z-x)(z-y)我知道把分母化成一样的、但是之后怎么算? x/(y+z)=y/(x+z)=z/(x+y)x/(y+z)=y/(x+z)=z/(x+y)=(x+y+z)/[(x+z)+(x+y)+(y+z)]=1/2y/(x+z)=z/(x+y)=（y-z）/【（x+z）-（x+y）】=-1我知道这是两种情况做法一是x+y+z≠0做法二是x+y+z=0我的疑问是做法二在证明中那里用到了 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 已知(X-2)的平方+|Y-3|+根号下Z-4=0,求X,Y,Z的值. 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? 已知x、y、z满足：根号下3x-2y-4+根号下2x-7y+3=根号下2x-4y-z·根号下z-2x+4y,求z的值. 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 已知2x(根号x+根号下y-1+根号下z-2)=x+y+z求x y z的值 设x,y,z属于【0,1】,则M=根号下|x-y|+根号下|y-z|+根号下|z-x|的最大值是 已知实数xyz满足x/y+z+y/z+x+z/x+y=1求x^2/y+z+y^2/z+x+z^2/x+y的值 纠正下！：已知实数xyz满足（x/y+z）+（y/z+x）+（z/x+y）=1求（x^2/y+z）+（y^2/z+x）+（z^2/x+y）的值 2（根号下X+根号下y-1+根号下z-2）=X+Y+Z,求x,y,z的值 已知：2（根号下x+根号下y-1+根号下z-2）=x+y+z,求x,y,z的值.