x、y、z满足3x+2y+z=5,2x+y-3z=1.

若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围 x/2=y/3=z/5 x+3y-z/x-3y+z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x：y：z的值 已知x，y，z为实数，满足x+2y-z=6x-y+2z=3 对满足(x+y)/2=(y+z)/3=(z+x)/7的任意实数x,y,z 已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值 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 已知实数x,y,z满足关系式2x-3y-z=0,x-2y+z=0,求x比y比z的值 已知实数 x y z 满足x+y-z=0 ,3x-y+2z=0 则x :y :z 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)