随着课改的深入,导数部分知识在高考当中所占的分值越来越高,同时难度也越来越大.2010年全国有10个城市的高考试卷以导数题作为后2道压轴题,2011、2012年更有所增加.纵观这些压轴题会发现有一种类型很值得我们注意,那就是以二阶求导为考点的题这种题所占的比例很大,所以做好这种类型 With the deepening of curriculum reform, the derivative part of the knowledge in the college entrance examination share of higher and higher scores, but also more and more difficult.In 2010 there are 10 cities in the college entrance examination papers with derivative questions as the latter two finale , 2011, 2012 more increased.According to these finale questions will find that there is a type that deserves our attention, that is, the second-order derivative as a test question this question a large proportion, so do this Kind of type