x+y+z=35(1) 2x-y=44(2) 2y-3z=0(3) 求x y z
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y
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,
x/2=y/3=z/5 x+3y-z/x-3y+z
已知 3x-y+2z=0 2x+y-3z=0,求x :y :z.
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
已知x:y:z=1:2:3,x+y+z=24,求x,y,z
已知{x:y:z=1:2:3,x+y+z=12,求x、y、z的值
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-