设数列{an}的前n项和为Sn,若a1=1,,3tSn-(2t+3)Sn-1=3
题型:解答题
问题:
设数列{an}的前n项和为Sn,若a1=1,,3tSn-(2t+3)Sn-1=3t(t为正常数,n=2,3,4…). (1)求证:{an}为等比数列; (2)设{an}公比为f(t),作数列bn使b1=1,bn=f(
|
设数列{an}的前n项和为Sn,若a1=1,,3tSn-(2t+3)Sn-1=3t(t为正常数,n=2,3,4…). (1)求证:{an}为等比数列; (2)设{an}公比为f(t),作数列bn使b1=1,bn=f(
|