讨论y=e^x-m*x^2零点的情况，直接不好画出函数零点位置，图像法非常直观，只需要修改m参数，就可以看到不同的情况。(Discuss the situation of y=e^x-m*x^2 zero, it is not good to draw the function zero point position directly, the image method is very intuitionistic, only need