【2x+y+3z=11 【3x+2y=11 【4x-..
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
x+2y+3z=14 2x+y+z=7 3x+y+2z=11
3x+2y+z=9,x+y+2z=0,2x+3y-z=11
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
设x+y+z=11求函数u=2x*x+3y*y+z*z的最小值
帮我解方程组:3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=?
x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z