近年来 ,中考试题更加灵活和开放 ,更加注重创新 ,命题立意于能力、注重考查学生数学思维能力、探索能力 ,同时更注重考查学生对图形的变化中引出的结论的“变”与“不变”规律的探究能力和认识能力 .例 1　 ( 2 0 0 4青岛市中考题 )四边形是大家最熟悉的图形之一 ,我们已经发? In recent years, the examination questions have been more flexible and open, they have focused more on innovation, propositions have focused on ability, focus on examining students’ mathematical thinking skills, and exploration capabilities, while also paying more attention to the “changes” and “invariability” of students’ conclusions drawn from changes in graphics. "The regular inquiry ability and cognitive ability. Example 1 (Quotes in Qingdao City in 2004) The quadrilateral is one of the most familiar graphics we have made.