题目是否是"X2+2（M+3）X+2M+14=0"
有两个实数根,则有：
△=4(m+3)^2-4(2m+14)=4m^2+24m+36-8m-56=4m^2+16m-20>=0
m^2+4m-5>=0
(m+5)(m-1)>=0
m>=1或者m