若x+y+z不为零,2x+y/z=2y+z/x=2z+x/y=k,k=?

若x+y+z不为零,2x+y/z=2y+z/x=2z+x/y=k,k=? 已知:x/6=y/4=z/3(x.y.z均不为零)则x+3y/3y-2z等于多少?3Q 已知(x-y)/13=y/7,则（x+y）/y=已知x/6=y/4=z/3(x,y,z均不为零）,则(x+3y)/(3y-2z)= 已知：4x-3y-6z=0,x+2y-7z=0,且x,y,z都不为零.求3x+2y+z/x+2y3z的值. 若x+y+z=3y=2z,则x/x+y+z=? 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 证明x*x*x+y*y*y=z*z*z(x.y.z为正整数)不成立. 若4x=7y+5z,2x+y=z,则x:y:z的值为 已知4x-3y-6z=0,x+2y-7z=0,且x,y,z都不为零.求（3x+2y+z）/（x+2y+3z）的值.｛x+y=90｛40%x+78%y=60%*95 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之（x-z)(y-z)=?第三部分那个是 （y+z-2x)(x-2y+z)分之（x-z)(y-z) 6分之X=4分之Y=3分之Z(X,Y,Z均不为零）则3Y-2Z分之X+3Y=?, 已知x,y,z都不为0,且满足4x-3y-3z=0,x-3y+2z则,x:y: 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z x/6=y/4=3/z [xyz均不为零】 则33y-2z分之x+3y=?x/6=y/4=3/z [xyz均不为零】 则3y-2z分之x+3y=?