lim |
n→∞ |
rn |
rnrn-1 |
1 | ||
|
1 | ||
|
1 | ||
|
1 |
n2 |
2 |
n |
1 |
n2 |
2 |
n-1 |
1 |
(n-1)2 |
2 |
n(n+1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
2n |
n+1 |
lim |
n→∞ |
2 |
n |
1 |
n2 |
2 |
n-1 |
1 |
(n-1)2 |
2 |
n(n+1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
2n |
n+1 |
A.2 | B.2或-2 | C.-2 | D.4 |
A.
| B.
| C.
| D.1 |
2 |
A.1个 | B.2个 | C.3个 | D.4个 |
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