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根据函数图像直接写出x的取值范围,是一个基本考点,因为涉及到数形结合,学生们要读懂图形语言,再转化为数学符号语言,思维有所跳跃,故而问题较多.笔者结合自己的教学工作,对本类题进行了归纳总结,按这样的数形结合的方法讲授本类型的题,学生们接受和理解起来更直观、容易很多.解题步骤:1.找(找分界线);2.察(观察函数图象):3.判断(谁在上谁就大).根据此方法可以解决所有初中关于利用函数图象直接写出x的取值范围的问题.在此三步骤中,最关
According to the function of the image directly write the value of x is a basic test site, because it involves the combination of number, the students have to understand the graphics language, and then converted to mathematical symbols language, thinking has been a jump, so more problems. Combined with their own teaching work, this type of questions were summarized, according to such a combination of several methods to teach this type of questions, students accept and understand more intuitive and easy to solve steps: 1. Find (Observation function image): 3. Judgment (who is on who is large) .According to this method can solve all junior high school on the use of function images directly write the range of values of x in this Three steps, the most relevant