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,数学教学应该通过新型的教学设计来实现学生积极的学习活动,帮助他们成为学习活动的主体,创设真实的问题情景或学习环境以诱发他们 The new curriculum standards for mathematics emphasizes that teachers’ effective teaching should lead students to meaningful mathematics learning. Meaningful mathematics learning must be based on students’ subjective aspirations and knowledge and experience. In this context, mathematics teaching should adopt new types of Teaching design to achieve students’ active learning activities, helping them to become the main body of learning activities, creating real problem scenarios or learning environments to induce them