数学是一门系统性很强的学科,每节课都是在前面已学过的内容的基础上引伸出一个或几个新问题。教师在讲课时要突出新的知识。减少不必要的重复。例如一元一次不等式组这一节,现行课本上有三个例题。若按书上的顺序去讲,就要解六个一元一次不等式例题。要在一堂课时间内讲完这三个例题和有关内容,势必灌得多,也冲淡了对公共解处理的讲解。我觉得一元一次不等式的解法早已被 Mathematics is a highly systematic subject, and each lesson builds upon one or more new questions based on what has been learned before. Teachers should emphasize new knowledge when lecturing. Reduce unnecessary duplication. For example, in the section on Unity of Inequalities, there are three examples in the current textbook. If you say in the order of the book, you must solve six unary inequalities. To finish these three examples and related contents within one class time is bound to pour in more and to dilute the explanation for the handling of public solutions. I think the solution to the inequality of one dollar has long been