（x-2)^2+(y-1)^2+(z-4)^2 = 100怎么换成参数方程啊?

1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) 2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值 x-z=-4 z-2y=-1 x+y-z=-1 怎么解 设x,y.z为实数,2x.3y.4z是等比数列,1/x,1/y.1/z是等差数列,则(x/z)+(z/x)是多少? 已知x,y,z满足 2倍(x-y的绝对值)+(2y的平方根)-z+(z×z)=-1/4,求x,y,z的值 分解因式 4a（x-y）²-a²（y-x）³ （x+y+z)（x-y+z）+(y-x+z) (y-x-z)（1）4a（x-y）²-a²（y-x）³ （2）（x+y+z)（x-y+z）+(y-x+z) (y-x-z) (x-y)^2+4z(x-y)+4z^2 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z} 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里 x^2+y^2+z^2+4x+4y+4z+1=0,求x+y+z x^2+y^2+z^2+4x+4y+4z+1=0求x+y+z x^2+y^2+z^2+4x+4y+4z+1=0 求x+y+z x+y+z=2 4x+2y+z=4 2x+3y+z=1 {x+2y+z=4,x+y+2z=-1,2x+y+z=1 3x-y+2z=-1 4x+y+z=5 x-2y-z=-2 4x+y+z=-3 2x+3y-4z=-10 x+2y-z=-1 5x+y+z=1 2x-y+2z=1 x+5y-z=4 x-y-z=1 2x+y-3z=4 3x-2y-z=-1