x+y+z=1,x2+y2+z2=2,x3+y3+z3=3,x4+y4+z4=?
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=0,x2+y2+z2=1,求xy+yz+xz,x4+y4+z4的解
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=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=?
数据x1,x2,x3,x4,x5与数据y1,y2,y3,y4,y5满足x1+y1=x2+y2=x3+y3=x4+y4=X
已知x3+y3-z3=96,xyz=4,x2+y2+z2-xy+xz+yz=12,则x+y-z=( )
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=4 xy=1,求x2+y2,x3+y3,x4+y4,x5+y5 x6+y6 x7+y7
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).