参数法是高中数学教学中的一个重点,一直被学生视为难点.此类问题不仅涉及的知识面广、综合性大、应用性强、灵活性高,而且情景新颖,能够很好的考查学生的创新能力和潜在的数学素质.因此,参数法一直是历年高考和竞赛命题的热点和重点.讨论参数的方法多种多样,但由于相似问题容? Parametric method is a key point in high school mathematics teaching and has always been regarded by students as difficult. Such problems involve not only comprehensive knowledge, comprehensiveness, strong applicability, high flexibility, but also a novel situation, which can well examine students. The innovative ability and potential mathematics qualities. Therefore, the parametric method has always been the focus and focus of the college entrance examination and competition propositions over the years. The methods of discussing parameters are varied, but due to similar problems