z=x^2+y^2,z^2=x^2+y^2,z=根号下x^2+y^2,他们的图形分别是什么?
z=(x+y)^2的图形
根号x+根号y-1+根号z-2=1/2(x+y+z),求x,y,z的值
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.
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.
2(根号下X+根号下y-1+根号下z-2)=X+Y+Z,求x,y,z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
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
设x+y^2+z=ln根号(x+y^2+z),求аz/аx (x+y^2+z)在根号下,
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y
已知2x(根号x+根号下y-1+根号下z-2)=x+y+z
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
(x+y-z)^2-(x-y+z)^2=?