已知X+Y+Z=0,求证X＾3 +Y＾3+Z＾3＝3XYZ

已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 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^3+y^3+z^3=3xyz 已知x,y,z>0,求证:√3/3(x+y+z) 已知：x+y+z=0.求证：x三次+y上次+z三次=3xyz. 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x,y,z∈（0,+∞）求证：√x^+xy+y^+√y^+yz+z^+√z^+zx+x^＞＝3/2(x+y+z ) 已知x+1/y=y+1/z=z+1/x,求证y/x+z/y+x/z=3 , 已知x+1/y=y+1/z=z+1/x,求证y/x+z/y+x/z=3 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 已知实数x,y,z满足x+y+z=1,x^2+y^2+z^2=1/2求X,Y,Z∈{0,2/3},已知实数x,y,z满足x+y+z=1,x^2+y^2+z^2=1/2求证X,Y,Z∈{0,2/3}, 已知：x+y+z=0,求证：x³+y³+z=3xyz.已知：x+y+z=0,求证：x³+y³+z³=3xyz. 已知x>0 y>0 z>0 求证 (y/x+z/x)(x/Y+z/y)(x/z+y/z)>=8如题. 已知x>0,y>0,z>0.求证（y/x+z/x）（x/y+z/y)(x/z+y/z）>=8