Functions are very important contents in junior high school mathematics curriculum.

函数是初中数学课程中非常重要的内容。

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Thus the research on how teachers and students use the two sets of junior high school mathematics textbooks having big influence seems to be very necessary, and also very valuable.

因而，对于在教学中教师和学生如何使用这两种有着较大影响的初中数学教材进行调查研究就显得非常必要，也很有价值。

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This is because the junior high school mathematics and mathematics in the abstract mathematical language, way of thinking, knowledge of the content and computing power requirements have changed a lot.

这是因为高中数学与初中数学在数学语言抽象程度、思维方法、知识内容和对计算能力的要求方面有很大的变化。

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