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作为一名数学教师,能结合教材内容编制一道有针对性考查目标的复习题,是体现其数学教学基本功的重要特征之一.在期末复习一元一次不等式组内容时,我发现学生对解一元一次不等式组的步骤执行掌握得很好,但对于一元一次不等式组解集意义的理解还存在严重不足.例如,教材中复习探索研究题:已知不等式组(?)(1)如果这个不等式组无解,求a的取值范围;(2)如果这个不等式组有解,求a的取值范围.
As a math teacher, we can compose a reviewing question with pertinence to the target of examination in combination with the content of teaching materials, which is one of the most important characteristics that reflect the basic skills of mathematics teaching.When reviewing the contents of the inequality group at the end of the period, However, there is still a serious shortage of understanding of the meaning of unary inequality set solution. For example, the textbook review explores the research topic: Known inequality group (?) (1) If this inequality group has no Solution, find a range of values; (2) If this inequality group has solution, find a range of values.