设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
若x:y:z=3:4:5且x+y+z=24,求x、y、z的值
若X:y:Z=3:4:5,且X+Y+Z=24,求X、Y、Z的值
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值
x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y----
已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值
若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值
已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值
若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值?
设K法解, 已知x : y : z =3 : 4 : 5 且2x+3y+z=46,求x+y+z的值
16.设x+y+z=3y=2z ,求x/(x+y+z)的值5.7
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值