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近几年高考试题和高考模拟题中均出现了解析几何中有关定值的证明与探究问题,所谓定值问题是指:若干个变量,比如x_1,x_2在某个变化过程中产生的某种结果f(x_1,x_2)恒定不变.从这一描述也可得到一种处理定值问题的基本方法:将定值对象尽可能表述为变量x_1,x_2的函数关系f(x_1,x_2),再考查f(x_1,x_2)与x_1或x_2无关,即可断言f(x_1,x_2)对于x_1或x_2而言是定值(常量).下面结合具体实例加以
In recent years, college entrance examination exam questions and simulation questions have emerged in the analytic geometry of the value of the proof and inquiry, the so-called fixed value problem is: a number of variables, such as x_1, x_2 in a certain process of change The result f (x_1, x_2) is constant, and a basic method for dealing with fixed-valued problems can also be obtained from this description: The fixed-value object is expressed as f (x_1, x_2) as possible for the variables x_1 and x_2, Then f (x_1, x_2) has nothing to do with x_1 or x_2 to assert that f (x_1, x_2) is a constant (constant) for x_1 or x_2.