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《数学课程标准》明确指出“有效的数学学习活动不能单纯依靠模仿和记忆,动手实践、自主探索与合作交流是学生学习数学的重要方式。”在教学中适当让学生进行动手操作,不仅能有效解决数学知识的抽象性与学生思维形象性的矛盾,而且对激发学生内在学习动机,提高动手操作能力,进而培养学生合作探究意识和数学思维的发展,有积极的意义。针对以往教学忽视学生实践的、感性的、操作的活动的状况,
“Mathematics Curriculum Standard” clearly states that “effective mathematics learning activities can not rely solely on imitation and memory, hands-on practice, independent exploration and cooperation and exchange is an important way for students to learn mathematics.” "Appropriate for students in teaching hands-on operation, not only Which can effectively solve the contradiction between the abstraction of mathematical knowledge and the imagination of students ’thinking. It is also of great significance to stimulate students’ intrinsic motivation to learn, improve their abilities of hands-on operation, and then develop their cooperative exploration awareness and mathematical thinking. For the past teaching neglect of student practice, emotional, operational activities of the situation,