①{x-3y=6;x/3+y=-2 ②﹛x+y+z=12;x+2y+5z=22;x=4y

①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z- 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, (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai x/2=y/3=z/5 x+3y-z/x-3y+z 1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 2x+5y+4z=6,3x+y-7z=-4,x+y-z=?