1.如果X=Y/2=Z/5,且X+Y+Z=16,则X=( )
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
x,y,z为实数且(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y-
如果X:Y:Z=3:4:5,且2X+3Y-5Z=-14,则X= Y= Z=
已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
已知:(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)
(x+y-z)(x-y+z)=
已知:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz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-
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
如果x/5=y/4=3/z,且z不等于0,求:x+y+z/3x-2y的值
若x + 1/y =y + 1/z =z + 1/x,且x,y,z互不相等,则x^2y^2z^2=( )