《数学课程标准》指出:“21世纪的公民面临着更多的机会和挑战,他们需要在大量纷繁复杂的信息中作出恰当的选择与判断,必须具有一定的收集和处理信息、作出决策的能力,同时能够进行有效的表达与交流。……,动手实践,自主探索与合作交流是学生学习的重要方式。数学教学,应该从学生的生活经验和已有的知识背景出发,向他们提供充分 ”Mathematical Curriculum Standards“ states: ”In the 21st century, citizens face more opportunities and challenges. They need to make proper choices and judgments in a large amount of complicated information. They must have certain information to collect and process information and make decisions Ability, at the same time be able to effectively express and exchange .... Hands-on practice, independent exploration and cooperation and exchange is an important way for students to learn.Mathematics teaching should be based on the students’ life experience and existing knowledge background, to provide them with full