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求变量最值问题是多年来中考数学中的经典题型,几年前主要探索点点间、点线间路径最值和常规函数最值,近两年又突破常规类型,发展为探究角、面积及它们的和差积等的最值,具体分为以下五种类型.一、平面内直线上一点到该直线同侧两点间路径的最值常见方法有两种:①作一点关于已知直线的对称点,连接它与另一点——线段最短;②解直角三角形或综合其它知识求线段长.好多压轴题中也见多这样的模型.
Variation of the value of the problem is over the years many senior high school entrance examination math in the classic questions, a few years ago to explore the point, the most value between the point line and the normal value of the routine function, the last two years and break through the conventional type, the development of the study angle, area And their sum of differential products, etc., are divided into the following five types: First, the plane of a straight line to the line between the two sides of the same way the most common two ways: ① make a point about the known The point of symmetry of the line, connecting it with another point - the shortest line segment; ② solution of right triangles or other knowledge of line length.