《数学新课程标准》指出:学生的数学学习活动应当是一个生动活泼、主动和富有个性的过程.学生的数学学习内容应当是现实的、有意义的、富有挑战性的,这些内容要有利于学生主动地进行观察、实验、猜测、验证、推理与交流等数学活动.数学学习内容的呈现应采用不同的表达方式,以满足多样化的学习需求.数学教学活动应激发学生兴趣,调动学生积极性,引发学生的数学思考,鼓励学生的创造性思维;要注重培养学生良 The New Curriculum Standard for Mathematics states that the students ’math learning activities should be a lively, proactive and individualized process, and students’ math learning content should be realistic, meaningful and challenging, which should be conducive to Students take the initiative to observe, experiment, guess, verify, reason and exchange mathematics activities, etc. The content of mathematics learning should be presented in different ways to meet diverse learning needs.Mathematics teaching activities should stimulate students ’interest and mobilize students’ enthusiasm , Trigger students ’mathematical thinking, to encourage students’ creative thinking; should pay attention to students