3x+2y+z=9,x+y+2z=0,2x+3y-z=11
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
3x+2y+z=9,x+y+2z=0,2x+3y-z=11
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
x/2=y/3=z/5 x+3y-z/x-3y+z
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
已知:2X-3y+2z=0,x+4Y-9/2z=0求:X:Z的值.X:y:Z的值.X+2y+X/X+y+Z的值. 已知:
x+2y+3z=14 2x+y+z=7 3x+y+2z=11
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
x+y-z=0 2x-3y+2z=5 x+2y-z=3