x^2-3x-1=0两根x1,x2,
x1+x2=3,x1x2=-1,
新方程两根为y1,y2,
y1^2+y2^2
=x1^2+x2^2
=(x1+x2)^2-2x1x2
=9+2=11,
y1^2*y2^2=(x1*x2)^2=1
新方程为y^2-11y+1=0
x^2-3x-1=0两根x1,x2,
x1+x2=3,x1x2=-1,
新方程两根为y1,y2,
y1^2+y2^2
=x1^2+x2^2
=(x1+x2)^2-2x1x2
=9+2=11,
y1^2*y2^2=(x1*x2)^2=1
新方程为y^2-11y+1=0