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常常有些老师开玩笑地说:“这个问题我讲了八遍了,学生还是不会做.”其实不在于做了多少遍,讲了多少遍,而在于有没有让学生拨开云雾,抓住问题本质.这就需要老师对训练做一些设计,让学生在训练中不断提升能力.下面以“直线与圆的位置关系”为例来说明.类型1判断直线与圆的位置关系已知直线和圆的方程,可以直接问两者的位置关系,也可以问交点的个数,这类问题是最简单的问题,常有两种方法,一是看由它
Some teachers often jokingly said: “This question I talked about eight times, the students still do not. ” In fact, not how many times done, talked about how many times, but because there is no let the students to open the clouds, catch The nature of the problem.This requires the teacher to do some training design, so that students continue to improve their abilities in the training below to “linear and circular position ” as an example to illustrate. Type 1 to determine the position of the line and the circle has been Know the straight line and the circle equation, you can directly ask the location of the relationship between the two can also ask the number of intersection points, such problems are the simplest problem, there are often two ways, one is to see it from