X+Y+Z=0 4X+2Y+1=-3Z X+4Y=9X+Y+Z=04X+2Y+1=-3ZX+4Y=9这个方程怎么解?

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 3X+Y+Z=0,2X-Y+3Z=1,X+2Y-Z=4 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 x+2y-z=-5 x+y+2z=-1 3x+4y-2z=-12x+2y-z=3 2x+y+3z=0 4x+z=-4 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值 已知4x-3y-3z=x-3y+z=0(x、y、z不等于0)(1)求x：y：z （2）求2x+3y-4z/z的值 {x+y+z=4 {2y+z=0 {3x+2y-4z=-1解方程 x+y/2=z+x/3=y+z/4 x+y+z=27 x+2y=3x+2z=4y+z 求x:y:z x+2y-z=0 2x-3z=1 3x-y+2z=4x+2y-z=02x-3z=13x-y+2z=4 已知4x-3y-3z=0,x-3y-z=0求(1)x:z的值.（2）x:y:z的值. {2x+y=10 {x-y+z=4 {3x-y-z=0 已知4x-3y+z=0 x+3y-11z=0,求:(1)x::z的值;(2)x:y:2的值;(3)x+3y-z/2x-3y+4z的值 六年级三元一次方程组.解下列方程组：(1)5x-3y+z=25x+2y-4z=3-5x+y-z=2(2)x-y-z=-13x_5y+7z=114x-y+2z=-1(3)9x-5y+z=-69x+y+4z=3-9x+3y-5z=0(4)x+y=22x+z=-27y+z=13 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值