题目内容
（文）
(
-
)=______．
| lim |
| n→∞ |
| n3 |
| 2n2-1 |
| n2 |
| 2n+1 |
| lim |
| n→∞ |
| n3 |
| 2n2-1 |
| n2 |
| 2n+1 |
=
| lim |
| n→∞ |
| n3(2n+1)-n2(2n2-1) |
| (2n2-1)(2n+1) |
=
| lim |
| n→∞ |
| n3+n2 |
| 4n3+2n2-2n-1 |
=
| lim |
| n→∞ |
1+
| ||||||
4+
|
=
| 1 |
| 4 |
故答案为：
| 1 |
| 4 |
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