2x-3y+z=0,3x-6z-2y=0,xyz≠0,求x²+y²+z²/2x+y²-z²

证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 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 2x+z=10 x+y-z=4 3x-y-z=0 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 (1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1. X+y-z=6;x-3y+2z=0;3x+2y-z=4 x-y+z=0,2x+y-2z=6,3x-y-z=3求解, {x+y-2z=-3 2x+6y+z=2 x+y+z=0 {x+y+z=0 4x+2y+z=3 9x+3y+z=6 {x+y+z=0 {4x+2y+z=3 {9x+2y+z=6 三元一次方程x-y+z=6 x+y-z=0 2x+3y+8z=33 1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38 已知方程组{2x-3y+z=0 且x*y*z不等于0 求 x：y：z {3x-2y-6z=0 x+y-z=6 x-3y+2z=0 3x+2y-z=0 求x、y、z 要过程 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z