我们班从初一年级开始成立了“智多星”数学兴趣小组 ,其主要任务是攻克学习中的疑难问题 ,探讨解题方法 .对于班级黑板报中的每期一题“征解” ,我们“智多星”数学兴趣小组成员积极撰稿 .请看一例 :题目　已知如图 1,梯形ABCD中 ,AB∥CD ,以AD和AC为边作平行四边形ACED ,DC的 Our class has established the “Zhi Duo Xing” math interest group since the beginning of the first grade. Its main task is to overcome the difficult problems in the study and to explore ways to solve problems. For each class of questions in the class blackboard report, “Enlistment”, we have “Chi Dao Xing” ” Math interest group members actively write. See an example: the title is known as Figure 1, trapezoidal ABCD, AB∥CD, with AD and AC as the side for the parallelogram ACED, DC’s