已知x+y+z=1,x2+y2+z2=2,x3+y3+z3=3,求1x+1y+1z
已知x+y+z=1,x2+y2+z2=2,x3+y3+z3=3,求xy(x+y)+yz(y+z)+zx(z+x)的值
已知x+y+z=1 x2+y2+z2=2 x3+y3+z3=3 求x4+y4+z4=?
已知x+y+z=2,x2+y2+z2=12则x3+y3+z3=
已知x+y+z=3,x2+y2+z2=19,x3+y3+z3=30则xyz=?
因式分解X2(Y+Z)+Y2(Z+X)+Z2(X+Y)-(X3+Y3+Z3)-2XYZ
x2+y2+z2=2007 ,x3+y3+z3=2008.求√x/y+√y/z+√z/x=?
已知x,y,z∈Z,且满足x+y+z=3,x3+y3+z3=3,求x2+y2+z2所有可能的值组成的集合.
已知x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求代数式x2/(y+z)+y2/(x+z)+z2/
已知实数x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求x2/(y+z)+y2/(z+x)+z2/(
已知x3+y3-z3=96,xyz=4,x2+y2+z2-xy+xz+yz=12,则x+y-z=( )
已知x,y,z是正实数,且x-y=-2,y3-z3-y2-yz-z2=0,求x-z的值
不等式选讲设x,y,z为正数,证明:2(x3+y3+z3)≥x2(y+z)+y2(x+z)+z2(x+y).