正如华罗庚所说的:“数形结合千般好.”它能让抽象的函数和直观的图形双向联系与沟通,化抽象为形象,达到化难为易的目的. 例1 求函数f’(x)=的最大值. 解析单从“数”的角度研究,求两根式差的最大值,似乎很难.换位从“形”的角度分析,三角形一边大于其余两边差,把目标函数看作两边之 As Hua Luogeng said: “The combination of numbers and shapes is as good as possible.” It enables two-way communication between abstract functions and intuitive graphics. It abstracts the image as an image and achieves the goal of making it difficult to achieve. Example 1 Find the function f’(x ) = the maximum value. Analytical single from the “number” point of view, find the maximum value of the two differences, it seems very difficult. Transposition from the “shape” point of view, one side of the triangle is greater than the remaining two edge difference, the objective function as Both sides