4an+1 |
an2an+22 |
5 |
4 |
an+1 |
an |
n+1 |
n |
a3 |
a2 |
3 |
2 |
a4 |
a3 |
4 |
3 |
a5 |
a4 |
5 |
4 |
an |
an-1 |
n |
n-1 |
an |
a2 |
n |
2 |
n |
2 |
Sn+1 |
Sn |
n+2 |
n |
S2 |
S1 |
S3 |
S2 |
Sn |
Sn-1 |
3 |
1 |
4 |
2 |
5 |
3 |
n+1 |
n-1 |
n(n+1) |
2 |
n(n+1) |
2 |
4an+1 |
an2an+22 |
4n+4 |
n2(n+2)2 |
1 |
n2 |
1 |
(n+2)2 |
|
5 |
4 |
1 |
210 |
1 |
210+1 |
1 |
210+2 |
1 |
211-1 |
A.M=1 | B.M<1 |
C.M>1 | D.M与1的大小关系不确定 |
A.a100=a-b,S100=50(a-b) | B.a100=a-b,S100=50a |
C.a100=-b,S100=50a | D.a100=-a,S100=b-a |
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