已知x^3+y^3-z^3=96,xyz=4,x^2+y^2+z^2-xy+xz+yz=12,则x+y-z等于

已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz 已知:xyz+xy+xz+yz+x+y+z=3 求：u=xyz(x+y+z) 的最大值 已知X+Y+Z=0,求证X^3+Y^3+Z^3=3XYZ 已知：x+y+z=0,求证：x^3+y^3+z^3=3xyz 已知:x+y+z=0,求证x^3+y^3+z^3=3xyz 已知：x+y+z=0.求证：x三次+y上次+z三次=3xyz. 代数式的恒等变形3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)(y+z）(z+x)/xyz的值 已知xyz满足|3x-2y+z|+|2x+y+2z|=0（xyz不等于o）求x+y除以z 已知xyz适合关系式√3x+y-z-2+√2x+y-z=√x+y-2011+2011-x-y,试求xyz的值 已知x^3+y^3-z^3=96,xyz=4,x^2+y^2+z^2-xy+xz+yz=12,则x+y-z等于 已知x,y,z满足xyz=1,求证x^3/(x+y)+y^3/(y+z)+z^3/(z+x)大于等于3 已知一个组：x^3+y^3+z^3=x+y+z x^2+y^2+z^2=xyz 求x,y,z的正整数解 已知实数xyz满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3求x+y+z的值 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 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x,y,z都是正数,且xyz=1,求证：x^2/(y+z)+y^2/(x+z)+z^2/(x+y)≥3/2 已知x:y=2:3,y:z=9:10,且x+y+z=50,则xyz=? 已知x+y+z=0,求多项式x^3+x^2z-xyz+y^3的值