小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com第04讲数列的通项公式目录01模拟基础练.......................................................................................................................................2题型一：观察法....................................................................................................................................2题型二：叠加法....................................................................................................................................3题型三：叠乘法....................................................................................................................................4题型四：形如an+1=pan+q型的递推式...............................................................................................6题型五：形如an+1=pan+kn+b型的递推式........................................................................................8题型六：形如an+1=pan+rqn型的递推式............................................................................................9题型七：形如an+1=panq(p>0,an>0)型的递推式............................................................................10题型八：形如an+1=manpan+q型的递推式............................................................................................10题型九：形如an+2=pan+1+qan型的递推式......................................................................................11题型十：形如an+1=man+tpan+q型的递推式............................................................................................12题型十一：已知通项公式an与前n项的和Sn关系求通项问题.....................................................14题型十二：周期数列..........................................................................................................................17题型十三：前n项积型......................................................................................................................19题型十四：“和”型求通项..............................................................................................................20题型十五：正负相间讨论、奇偶讨论型..........................................................................................22题型十六：因式分解型求通项..........................................................................................................24题型十七：双数列问题......................................................................................................................24题型十八：通过递推关系求通项......................................................................................................2602重难创新练.....................................................................................................................................3103真题实战练.....................................................................................................................................44小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com题型一：观察法1．（2024·高三·河北唐山·期中）若数列的前6项为，则数列的通项公式可以为（）A．B．C．D．【答案】D【解析】通过观察数列的前6项，可以发现有如下规律：且奇数项为正，偶数项为负，故用表示各项的正负；各项的绝对值为分数，分子等于各自的序号数，而分母是以1为首项，2为公差的等差数列，故第n项的绝对值是，所以数列的通项可为，故选：D2．数列0.3，...