3x+4y-z=4,2x+3y+2z=11,6x-2y+2z=10
x+y+z=4 2x+3y-z=6 3x+2y+2z=10
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
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
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
x+2y+3z=10,x-y+4z=10,x+3y+2z=2
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
x-y+4z=10,x+3y+2z=2,x+2y+3z=11.
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?