设线性方程组x+λy+z=2,x-y+z=3,λx+y+2z=2有唯一解λ是多少
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
设x+y+z=11求函数u=2x*x+3y*y+z*z的最小值
16.设x+y+z=3y=2z ,求x/(x+y+z)的值5.7
x/2=y/3=z/5 x+3y-z/x-3y+z
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
已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
(x+y-z)^2-(x-y+z)^2=?
麻烦再给解一个,解非齐次线性方程组{2X+3Y+Z=4,X-2Y+4Z=-5,3X+8Y-2Z=13,4X-Y+9Z=-
x,y,z为实数 且(y-z)^2+(x-y)^2+(z-x)^2=(y+z-2x)^2+(x+z-2y)^2+(x+y