[复习说明 ]在 1984年至 1987年连续四年中 ,全国高考数学试卷都有一道偏难的递推数列解答题 ,这引发了 1985年至 1989年全国有关递推数列题型 (如高阶等差数列、分式递推数列等 )的研究高潮 .1989年至今相继出现的递推数列高考解答题降低了难度 ,侧重考查运用常用方法求递推数 [Review] In the four years from 1984 to 1987, the national college mathematics examination papers all had a difficult recursive series of questions, which led to the nation’s recursive series of questions from 1985 to 1989. The research climaxes of equal-difference series, fractional recursive series, etc.). The recursive series of college entrance examination questions that have appeared successively since 1989 have reduced the difficulty, focusing on the use of common methods to find recursive numbers.