代数中讲过函数和它的图象以后,遇有机会,适当地让学生做一些用图解法解方程或不等式的习題是有很大好处的。这不仅可以复习以前学过的函数的图象,并且可以使同学們对問題的认識更为深刻,同时还能使他們体会到函数的图象的用处。例如,在讲高中代数第三册104頁的例4:解(x~2-3x+2)/(x~2-2x-3)<0时,我們先讲了課本中的方法,然后介紹下面的列表法。 After talking about the function and its image in algebra, it is of great benefit to allow students to do some exercises to solve equations or inequalities graphically. This not only allows us to review the images of previously learned functions, but also enables students to deepen their understanding of the problems and also enables them to appreciate the usefulness of the images of functions. For example, when we talk about example 4: solution (x~2-3x+2)/(x~2-2x-3)<0 in high school algebra, third book, page 104, we first talk about the methods in the textbook and then introduce The following list method.