研究某些数量在运动变化过程中的最大(小)值,是研究事物的重要内容.这类问题的解决思路灵活,方法多样,能较好地训练思维,一直受到广泛的重视.各种期刊上介绍了大量行之有效的处理方法,但如果只是生搬硬套解题方法,而忽视验证对取得最值的条件是否成立,往往会出现错误.尤其是在几何 The study of the maximum (small) value of certain numbers in the process of movement is an important part of the study of things. This type of problem has a flexible approach, a variety of methods, and a good ability to train thinking. It has been receiving extensive attention. A great deal of effective processing methods were introduced, but if you just applied the method of solving problems and ignored the verification that the conditions for obtaining the best value were established, errors would occur. Especially in geometry.