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平行四边形是一类特殊的四边形,平行四边形知识是平面几何重要的基础知识,有着广泛的应用.北师大版教科书把平行四边形的内容由义教版的一节分编成《四边形性质探索》和《证明(三)》两章,分别编排在《数学》八年级上册和《数学》九年级上册,这种编排旨在实行代数、几何内容交叉,分散学习难点,降低学习难度,吸引学生学习数学的兴趣.但是,在实际教学过程中,却感到有众多的困惑.困惑一没有种概念的定义给数学概念下定义,就是指出被定义的概念的最
Parallelogram is a special kind of quadrilateral, parallelogram knowledge is an important basic knowledge of plane geometry, has a wide range of applications.Beijing Normal University Edition textbook parallelogram content from the section of the textbook compiled into “the exploration of the nature of the quadrilateral” And “Certificate (III)” are arranged in the eighth grade of mathematics and the ninth grade of mathematics respectively. This kind of arrangement aims at implementing algebra, cross-sectional geometry, distracting learning difficulties, reducing the difficulty of learning and attracting students' learning Mathematics.However, there are many puzzles in the actual teaching process.Perception-Definition of Mathematical Concept, Definition of Mathematical Concept, is to point out the concept of the most defined