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解析几何中的“范围”问题一直是高考中的难点和热点.难在它综合性强、灵活性高,热的是它融众多知识和技巧于一体,深得命题者偏爱.据笔者不完全统计,近十年的全国高考中,此类问题(包含最值)每年不少于10题,2013年多达19题,更有不少省份每年以这类问题为压轴题.因为这类题目条件隐晦、变数较多、关系复杂、计算繁琐,在教学中我们发现:有相当一部分学生往往感到心中无数,甚至有些不知所措,有的
Analytic geometry in the “range ” problem has been the college entrance examination difficult and hot. Difficult in it comprehensive, high flexibility, the heat is it melts many knowledge and skills in one, won the proposition preference .According to the author Incomplete statistics, the national examination in the past decade, such issues (including the most value) of not less than 10 questions a year, as many as 19 questions in 2013, many more provinces each year to take such issues as the finale issue. Class title conditions are obscure, more variables, complex relationships, computational complexity, we found in teaching: a considerable number of students often feel innumerable, and even overwhelmed, and some