教材分析:普通高中课程标准教科书(人民教育出版社)A版必修5第二章《数列》。错位相减法是数列求和的重要方法之一,也是历年高考考查的重点,更是一个难点,学生往往失分较多,所以专门安排一节课学习错位相减法,帮助学生掌握方法,形成知识体系。之前在推导等比数列求和公式时,学生接触过一次,但是没有推广到一个等差数列与一个等比数列的对应项乘积组成的数列的求和。由于错位相减法求和的步骤比较多,计算过 Textbook analysis: ordinary high school curriculum standard textbook (People’s Education Press) A compulsory 5 Chapter II “series.” Dislocation subtraction method is one of the important ways to sum up series, but also the focus of the college entrance examination over the years, but also a difficult point, students tend to lose more, so a special lesson arranged to learn dislocation subtraction method to help students master the method to form knowledge system. Before deriving the summation of geometric series, the student touches once, but does not generalize to the summation of the series of products of the corresponding product of an arithmetic series and a geometric series. As the dislocation subtraction method of summation of more steps, calculated