x^2+(m-1)x+m(1-2m)=0
(x-m)(x-1+2m)=0
两根为x=m,1-2m
1.m1-2m ,得:m1/3
2.2=x^2+y^2=m^2+(1-2m)^2=5m^2-4m+1
5m^2-4m-1=0
m=1,-1/5