| lim |
| n→∞ |
| an2+cn |
| bn2+c |
| lim |
| n→∞ |
| bn+c |
| cn+a |
| a |
| b |
| b |
| c |
| a |
| c |
∴
| lim |
| n→∞ |
| an2+bn+c |
| cn2+an+b |
| lim |
| n→∞ |
a +
| ||||
c+
|
| a+0+0 |
| c+0+0 |
| a |
| c |
故选D．
| lim |
| n→∞ |
| an2+cn |
| bn2+c |
| lim |
| n→∞ |
| bn+c |
| cn+a |
| lim |
| n→∞ |
| an2+bn+c |
| cn2+an+b |
| 1 |
| 6 |
| 2 |
| 3 |
| 3 |
| 2 |
| lim |
| n→∞ |
| an2+cn |
| bn2+c |
| lim |
| n→∞ |
| bn+c |
| cn+a |
| a |
| b |
| b |
| c |
| a |
| c |
| lim |
| n→∞ |
| an2+bn+c |
| cn2+an+b |
| lim |
| n→∞ |
a +
| ||||
c+
|
| a+0+0 |
| c+0+0 |
| a |
| c |