若x^2+y^2+z^2=2x+6y+8z-26,求xyz/x^2+y^2+z^2的值
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知XYZ满足方程组 X+Y-Z=6 Y+Z-X=2 Z+X-y=0 求X Y Z的值
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值.
已知实数xyz满足x/y+z+y/z+x+z/x+y=1求x^2/y+z+y^2/z+x+z^2/x+y的值
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
有实数x,y,z;已知x+y+z=2,xyz=4;求Z的取值区间
方程组X:Y:Z=4:7:8,X+Y+2Z=54 求XYZ
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
因式分解 (x+y+z)^2+yz(y+z)+xyz
2x+y+z=17 x+2z+y=14 x+z+2y=13 求:xyz