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