若(2x-3)2+(2x+y)2+|3z-y|=0,则x-y-z=___.
若(2x-3)2+(2x+y)2+|3z-y|=0,则x-y-z=___.
已知x+2y-3z=0,2x+3y+5z=0,则x+y+zx-y+z= ___ .
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
证明:(y+z-2x)3+(z+x-2y)3+(x+y-2z)3=3(y+z-2x)(z+x-2y)(x+y-2z).
若4x-3y-6z=0,x+2y-7z=0(xyz≠0),则x:y:z=______.
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,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+(-2)|+|y+3|+|z|=0,求x+y+z的值.
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
thank you已知x+3y+5z=0,2x+3y+z=0 且x、y、z.都不是0,则(2y-z)(2y+z)除以z的