若x,y,z满足3x+7y+z=1,4x+10y+z=2006,求分式2005x+2005y+2005z/x+3y的值.

已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值 已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3 若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求（y+z)（x+z)（x+y)/xyz的值 若有理数x、y、z满足等式(x-1)^2+(2x-y)^4+|x-3z|=0,求x、y、z的值 已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值 已知X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值 1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求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. 一条分式数学题已知x y z满足x/x+y + y/z+x + z/x+y =1,求x²/x+y + y&su 若X.Y.z满足2X+3Y+z=18,4X-3Y+5z=24,求X+3Y的值 x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y---- 若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围