已知数列{an}的前n项和为Sn,且an是Sn与2的等差中项,而数列{bn}的首项为1,bn+1-bn-2=0. (1)求a1和a2的值; (2)求数列{an},{bn}的通项an和bn; (3)设cn=an?bn,求数列{cn}的前n项和Tn. |
与“已知数列{an}的前n项和为Sn,且an是Sn与2的等差中项,而数列{bn}的首项为1,bn+1-bn-2=0.(1)求a1和a2的值;(2)求数列{an},{bn}的通项an和bn;(3)设cn=an•bn,求数列{cn}的前”考查相似的试题有: