《中学生数学》(初中版)的“课外练习”是深受读者喜爱的优秀栏目,编者从众多的来稿中精心遴选出了一些具有思考性、启发性的问题,让学生在学习之余,小试锋芒.但有些问题的解答过于冗繁,不够简明,存在探讨、改进的空间.下面给出贵刊2011年第12期的两道课外练习几何题的简解,供读者参考. The “Extra-curricular Exercises” of “Junior High School Maths” (Junior High School Edition) is an excellent column loved by the readers. The editors carefully selected some thoughtful and enlightening questions from a large number of contributions to allow students to study However, some of the answers to the problem is too cumbersome, not concise, there is room for exploration, improvement. Here is your article in 2011 the twelfth period of two extra-curricular geometry questions for readers reference.