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导数在高考中所占比例日趋加大,有关导数题目也不断创新．近年有一类由导函数的图像来研究函数性质的题目,引起了大家的关注．一、两个实用结论1．导函数图像中,在x轴上方区域对应原函数单调递增区间;在x轴下方区域对应原函数递减区间．2．在导函数图像中,图像由x轴上方到x轴下方与x轴的交点为极大值点;由x轴下方到x轴上方与x轴的交点为极小值点．
Derivatives in the college entrance examination in the proportion of increasing, the derivative problem is also continuous innovation. In recent years, there is a class of topics that lead to the study of the nature of functions by the derivative of the derivative functions, attracting everyone’s attention. First, two practical conclusions 1. In the derivative image, the region above the x-axis corresponds to a monotone increasing interval of the original function; the region below the x-axis corresponds to the decreasing range of the original function. 2. In the derivative image, the intersection of the image from the top of the x-axis to the bottom of the x-axis and the x-axis is the maximum point. The point of intersection between the x-axis and the bottom of the x-axis is the minimum point.