有未知数x y z(z+y=x) 18-4x-y=0 9-z-4x=0 \(≧▽≦)/~
4x-3y-6z=0,x+2y-7z=0,xyz的积不等于0,求(x+y-z)/(x-y+2z)的值
已知4x-5z=y-x+6z=x+y+z,xyz不等于0,求x:y:z
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/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值
已知:(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)
已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
解方程组{x+4y-z=2,2x+3y+z=4,3x+5y+z=9,先消去未知数z得到的二元一次方程组是
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
设x,y,z 都属于R,且(x-z)²-4(x-y)(y-z)=0,求证:x,y,z成等比数列.
方程组{4x-3y-3z=0,x-3y+z=0,(x.y.z不等于0),求x/z和y/z的值?
4x-3y-3z=0 x-3y+z=0 并且X Y Z不等于0 求x:z 和y:z的值