因此.滿足a1a2-am=的正整數(shù)只有兩個(gè), 查看更多

 

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(2012•安徽模擬)已知等差數(shù)列{an}的前n項(xiàng)之和為Sn,且
a4
S4
=
2
5
,S6-S3=15

(1)求數(shù)列{an}的通項(xiàng)公式;
(2)若數(shù)列{bn}滿足對(duì)任意的正整數(shù)m,n都有bm+n=bmbn,且b1=
1
2
.對(duì)數(shù)列{anbn}的前n項(xiàng)和Tn

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已知等差數(shù)列{an}的前n項(xiàng)之和為Sn,且
a4
S4
=
2
5
,S6-S3=15

(1)求數(shù)列{an}的通項(xiàng)公式;
(2)若數(shù)列{bn}滿足對(duì)任意的正整數(shù)m,n都有bm+n=bmbn,且b1=
1
2
.對(duì)數(shù)列{anbn}的前n項(xiàng)和Tn

查看答案和解析>>

已知等差數(shù)列{an}的前n項(xiàng)之和為Sn,且
(1)求數(shù)列{an}的通項(xiàng)公式;
(2)若數(shù)列{bn}滿足對(duì)任意的正整數(shù)m,n都有bm+n=bmbn,且.對(duì)數(shù)列{anbn}的前n項(xiàng)和Tn

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已知等差數(shù)列{an}的前n項(xiàng)之和為Sn,且
(1)求數(shù)列{an}的通項(xiàng)公式;
(2)若數(shù)列{bn}滿足對(duì)任意的正整數(shù)m,n都有bm+n=bmbn,且.對(duì)數(shù)列{anbn}的前n項(xiàng)和Tn

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方程6×(5a2+b2)=5c2滿足c≤20的正整數(shù)解(a,b,c)的個(gè)數(shù)是


  1. A.
    1
  2. B.
    3
  3. C.
    4
  4. D.
    5

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