若(x-z)2-4(x-y)(y-z)=0,试求x+z与y的关系.
x分之y+z=y分之z+x=z分之x+y(x+y+z不等于0),求x+y+z分之x+y-z
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知|x+(-2)|+|y+3|+|z|=0,求x+y+z的值.
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
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
已知x,y,z满足{4x-3y-3z=0,x-3y+z=0.(x不等于0,y不等于0,z不等于0)求x/z和y/z的值
若/x+2y-5/+(2y+3z-13)²+(3z+x-10)²=0,试求x,y,z的值.
已知3X=5Y ,4Y=5Z,求:(1) Y与Z的比值 (2) x:y:z
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
已知一方程组:x-3y+7z=0与x-2y+4z=0(xyz≠0),求x:y:z.
若x+y+z不等于0,且x/(y+z)=y/(z+x)=z/(x+y),求x/(x+y+z)的值大神们帮帮忙