数学新课程标准特别强调教师的有效教学应指向学生有意义的数学学习,有意义的数学学习又必须建立在学生的主观愿望和知识经验基础之上。在此背景下,教学应该通过设计现实主题或问题以支撑学生积极的学习活动,帮助他们成为学习活动的主体,创设真实的问题情境或学习环境以诱发他们进行探索 The new mathematics curriculum standard emphasizes that the effective teaching of teachers should point to meaningful mathematics learning of students. The meaningful mathematics learning must be based on the students’ subjective desire and knowledge experience. In this context, teaching should be designed to support the active learning activities of students through the design of realistic topics or problems, to help them to become the main body of learning activities, to create a real problem situation or learning environment to induce them to explore