标题 | 日期 |
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已知数列 an bn无穷等比数列{an}的{bn}的公... | 2011-08-28 |
已知数列 an bn{an}{bn}满足,对任意n... | 2011-09-27 |
已知数列 an bn{an}中,a(1)=3,a(... | 2011-09-28 |
已知数列 an bn{An}前n项和为Sn,且对任... | 2011-10-01 |
已知数列 an bn{an}前n项和为Sn , a... | 2011-10-06 |
已知数列 an bn{bn}(bn大于0)的首项为... | 2011-10-15 |
已知数列 an bnan中a1=2,an=(2a(... | 2011-10-15 |
已知数列 an bn正项数列{An}中,2A(n+1)... | 2011-10-23 |
设已知数列 an bnan前n项和为sn,对任意正整数nh,都有an=5sn+1,记bn=(4+an)/(1-an), (1)求an与bn的通项公式; | 2012-01-18 |
已知数列 an bnan=2n-1,bn=1/(cosan+cos(an+1)),求bn的前n项和 | 2012-05-28 |