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几何问题中的定值问题其实就是研究几何图形在运动变化过程中的恒成立问题,这种恒成立问题反映了该几何问题的本质特征.因为定值问题是几何问题的核心问题之一,所以在全国各地高考试题中,对圆锥曲线中的定值问题考查屡见不鲜.下面就2016年北京文科高考19题的背景与拓展谈谈笔者的一点思考.【真题再现】(2016年北京文科高考19题)已
The fixed value problem in geometric problems is actually the study of the constant establishment problem of geometric figures in the process of motion change. This constant establishment problem reflects the essential characteristics of the geometric problem. Because the fixed value problem is one of the core issues of geometric problems, so In the examination questions in all parts of the country, it is not uncommon to examine the fixed value problem in the conic section. Let’s talk about the author’s thoughts about the background and development of the 19 questions in the Beijing liberal arts college entrance examination in 2016. 【Reproduced on Zhenti】 (19 questions in the Beijing liberal arts college entrance examination in 2016 ) Has