摘要: 数列{an}中.a1=1.前n项和为Sn.对任意.是等差数列. (1)求, (2)求{an}的通项公式, (3)求的值.
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已知数列{an}中,a1=1,前n项和为Sn,且点P(an,an+1)(n∈N*)在直线x-y+1=0上.
(1)求证:{an}是等差数列;
(2)设
+
+
+…+
=Tn,求证Tn<2.
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(1)求证:{an}是等差数列;
(2)设
1 |
S1 |
1 |
S2 |
1 |
S3 |
1 |
Sn |