根据“韦达定理”得:
x1+x2=6 x1*x2=2
则:x2/x1+x1/x2
=(x2^2+x1^2)/(x1*x2)
=[x2+x1)^2-2x1x2]/(x1*x2)
=[6^2-2*2]/2
=32/2
=16 .