2an |
7 |
2 |
49 |
4 |
2an |
1 |
2n |
1 |
2 |
1 |
22 |
1 |
2n |
1 |
2 |
1 |
22 |
1 |
2n |
1 |
2n+1 |
1 |
2 |
1 |
2 |
1 |
22 |
1 |
2n |
1 |
2n+1 |
1 |
2n |
1 |
2n+1 |
1 |
2n |
1 |
2n+1 |
A.an=1-(-1)n | B.an=1+(-1)n+1 | ||
C.an=2sin2
| D.an=(1-cosnπ)+(n-1)(n-2) |
A.有3个 | B.有2个 | C.有1个 | D.不存在 |
1 |
2n |
1 |
8888 |
A.33 | B.31 | C.27 | D.57 |
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