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在初等数学中,变量间的复合关系是普遍存在的,利用变量问复合的函数关系解题是灵活运用数学知识不可缺少的一个重要方法,也是学生解题必须具备的基本技能之一。这个方法只要恰当地选取中间变量,就能明显地看出式子具备的特点,进而寻求出正确的解题途径,简化解题过程。利用变量间的复合关系解题一般有如下三种方法。一、部分换元的方法: 这种方法就是利用变量间的复合关系,恰当地把式子中的一部分或某些部分(特别
In elementary mathematics, the compound relationship between variables is ubiquitous. Using the function of variable to ask questions is an indispensable method to apply mathematical knowledge. It is also one of the basic skills that students must possess. As long as this method properly selects the intermediate variables, we can clearly see that the formula has the characteristics, and then find the right way to solve problems and simplify the problem-solving process. The use of composite relations between variables to solve the problem generally have the following three methods. First, the partial replacement method: This method is to use the compound relationship between variables, the appropriate part of the formula or some parts (in particular