2x+3y+z=11,3x+y-z=2,x+y+z=6求解
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
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=4 x-2y+z=-2 x+2y+3z=0求解
求解三元一次方程组:{x+y/2=y+z/3=z+x/4 x+y+z=27
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,
求解三元一次方程组{2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13}
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=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
x+y+z=18,8x+6y+6z=118,2y+z=20求解过程
x+2y+3z=14 2x+y+z=7 3x+y+2z=11