编者按:李治国和徐友成、王国涛三位老师先后来稿对一道统考题进行了研究,两篇稿件各有特色,但内容存在重复之处,故将两篇稿件修改后合并成一篇文章刊出,特此说明.1.问题的提出湖北省孝感市2012年高三第二次统一测试题理科19题为:已知椭圆C的离心率e Editor’s Note: Li Zhiguo and Xu Youcheng, Wang Guotao three teachers have contributed to a unified test questions were studied, the two manuscripts have their own characteristics, but there is duplication of content, so the two manuscripts modified merged into an article published, Hereby explain .1 raised the issue of Xiaogan City, Hubei Province in 2012 the third high school second unified test subjects 19 entitled: Known elliptical C eccentricity e