1.判别式=(m-3)^2+4m^2>0所以有方程有二个不相等的实根.2.x1+x2=m-3,x1x2=-m^2<0故二个根一个正一个负,则设x1<0,x2>0有-x1=x2-2,x1+x2=m-3=2,m=5方程是x^2-2x-25=0(x-1)^2=26x1=1+ 根号26,X2=1-根号26或有x1>0,x2<0有x1=-x2-2,x1+x2=m-3=-2, m=1方程是x^2+2x-1=0(x+1)^2=2x1=-1+根号2X2=-1-根号2