根据韦达定理有x1+x2=2m,x1*x2=m+2
那么 x1^2+x2^2=(x1+x2)^2-2x1*x2
=4m^2-2(m+2)>2
2m^2-m-3=(m+1)(2m-3)>0
m>3/2 或m