x+y+z=35 2x-y=5 y/3=z/2 求x,y,z
x/2=y/3=z/5 x+3y-z/x-3y+z
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=z/3,x+y+z =12,求2x+3y+4z是多少,
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
已知3x=4y,2y=5z,试求x:y:z
3x=4y 2y=5z 试求x:y:z
2分之x=3分之y=5分之z x+y+z=20 求x,y,z
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
x+2y+3z=20,x+3y+5z=31,求x+y+z的值
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z