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函数是刻画和研究现实世界变化规律的重要模型,也是初中数学的重要内容,它在初中数学中具有较强的综合性。在教学中,学生常常觉得函数抽象深奥、高不可攀,老师也觉得函数难教,讲了学生也理解不了,理解了也不会解题。其实不然,数学知识的教
Function is an important model to describe and study the changing law of the real world. It is also an important part of junior high school mathematics. It has a strong comprehensiveness in junior high school mathematics. In teaching, students often think abstraction abstruse function, impossible, the teacher also felt that the function difficult to teach, about the students can not understand, understand will not solve the problem. In actual fact, the teaching of mathematical knowledge