2x平方+3x-1=0
根据韦达定理
x1+x2=-b/a=-3/2
x1*x2=c/a=-1/2
1.
平方和
x1^2+x2^2
=(x1+x2)^2-2x1x2
=(-3/2)^2-2*(-1/2)
=13/4
2.
倒数和
1/x1+1/x2
=(x1+x2)/x1x2
=(-3/2)/(-1/2)
=3