x-y+z=0,2x+y-2z=6,3x-y-z=3求解,

2x+3y+z=11,3x+y-z=2,x+y+z=6求解 x+y+z=4 x-2y+z=-2 x+2y+3z=0求解 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 求解三元一次方程组：｛x+y/2=y+z/3=z+x/4 x+y+z=27 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 x/2=y/3=z/5 x+3y-z/x-3y+z 三元一次方程求解：①x+2z=3,2x+y=2,2y+z=7.②x+y+z=2,3x-y-4z=5,2x+3y-2z=0 x+y-z=6 x-3y+2z=0 3x+2y-z=0 求x、y、z 要过程 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值 已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z