求{x+y-z=5；2x+3y+z=10；x-2y-z=20中x、y、z的值,

已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 2x+y-z=3 5x+3y-z=10 求x+y+z= x+y-z=5,2x+3y+z=10,x-2y-z=20求方程组 方程组{x/2+y/3-z=-5,x/3-y/2+z/2=10,x/2-y/3-z/4=6,求x,y,z x+y-2z=5 2x-y-z=4 3x+y-3z=10；分别求x、y、z的值. 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 求{x+y-z=5；2x+3y+z=10；x-2y-z=20中x、y、z的值, x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z x/10 = y/8 =z/9 求x+2y+3z/y-5z X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z x-y-2z=10 y-3z=-4 3x-y+5Z=21 三元一次方求大神x-y-2z=10y-3z=-43x-y+5Z=21 x+2y=3x+2z=4y+z 求x:y:z 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 x+y+z=35 2x-y=5 y/3=z/2 求x,y,z 已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? x+2y+3z=23 y-z=5 x+2z=10 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