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一、三个基本。基本概念要清楚,基本规律要熟悉,基本方法要熟练。关于基本概念,举一个例子。比如说速率。它有两个意思:一是表示速度的大小;二是表示路程与时间的比值(如在匀速圆周运动中),而速度是位移与时间的比值(指在匀速直线运动中)。关于基本规律,比如说平均速度的计算公式有两个经常用到V=s/t、V=(vo+vt)/2。前者是定义式,适用于任何情况,后者是导出式,只适用于做匀变速直线运动的情况。再说一下基本方法,比如说研究中学问题是常采用的整体法和隔离法,就是一个典型的相辅形成的方法。最后再谈一个问题,属于三个基本之外的
One or three basics. The basic concepts must be clear, the basic laws must be familiar, and the basic methods must be skillful. For basic concepts, give an example. For example, rate. It has two meanings: First, it indicates the size of the speed; Second, it represents the ratio of distance to time (such as in a uniform circular motion), and speed is the ratio of displacement to time (refers to the uniform linear motion). Regarding the basic laws, for example, the average speed is calculated using two formulas V=s/t and V=(vo+vt)/2. The former is a definitive formula, applicable to any situation, and the latter is a derivation, which is only applicable to the case of a straight line moving at a constant speed. Let me talk about the basic methods. For example, the study of the secondary school problem is a commonly used holistic method and isolation method. It is a typical complementary method. Finally, talk about a problem that belongs to three basic