3 |
5 |
1 |
an-1 |
1 |
an-1 |
1 |
an-1 |
1 |
an-1 |
1 |
an+1-1 |
1 |
an-1 |
an-1-an+1+1 |
(an+1-1)(an-1) |
an-an+1 |
an+1an-an+1-an+1 |
an-an+1 |
2an-1-an+1-an+1 |
an-an+1 |
an-an+1 |
3 |
5 |
1 |
a1-1 |
1 | ||
|
5 |
2 |
5 |
2 |
7 |
2 |
1 |
bn |
1 | ||
n-
|
2n-5 |
2n-7 |
2 |
2n-7 |
2 |
2n-7 |
2 |
2n-7 |
A.0个 | B.1个 | C.2个 | D.3个 |
1 |
2 |
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