an |
2n+1 |
x2 |
3 |
4x |
3 |
an |
2n+1 |
a1+a2+…+an |
n |
an+1 |
2n+3 |
an |
2n+1 |
2n+1 |
2n+3 |
2n-1 |
2n+1 |
(2n+1)2-(2n-1)(2n+3) |
(2n+1)(2n+3) |
4 |
(2n+1)(2n+3) |
2n-1 |
2n+1 |
1 |
3 |
x2 |
3 |
4x |
3 |
2n-1 |
2n+1 |
x2 |
3 |
4x |
3 |
1 |
3 |
3 |
3 |
3 |
3 |
2n |
2n+1 |
A.an>an+1 | B.an<an+1 | C.an=an+1 | D.不能确定 |
an+1 |
an |
n |
n+1 |
a | n |
3 |
5 |
7 |
A.an=
| B.an=2n-1 | C.an=
| D.an=2n+1 |
A.an=-2n+3 | B.an=n2-3n+1 | C.an=
| D.an=1+log2n |
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