已知命题p:a∈R且IaI
问题描述:
已知命题p:a∈R且IaI
答
x1+x2=1-a^2,x1x2=a-2
(x1-1)(x2-1)=x1x2-(x1+x2)+1
=a-2+a^2-1+1=a^2+a-2