已知三个方程:x+y=31,x+z=46,y+z=55,x.y.z值是多少?
(x+y-z)(x-y+z)=
已知三个质数x、y、z满是x+y+z+xyz=99那么|x-y|+|y-z|+|z-x|的值等于
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)
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值
已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
x*(y-Z)=27,y*(x-Z)=35,Z*(x+y)=28三个方程正整数解
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
X+Y+Z=?
x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y----
y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值