题目内容
求下列极限:
(1)
;
(2)
(
-n);
(3)
(
+
+…+
).
(1)
lim |
n→∞ |
2
| ||
5n2+7 |
(2)
lim |
n→∞ |
n2+n |
(3)
lim |
n→∞ |
2 |
n2 |
4 | ||
|
2n |
n2 |
(1)
=
=
.
(2)
(
-n)=
=
=
.
(3)原式=
=
=
(1+
)=1.
lim |
n→∞ |
2n2+n+7 |
5n2+7 |
lim |
n→∞ |
2+
| ||||
5+
|
2 |
5 |
(2)
lim |
n→∞ |
n2+n |
lim |
n→∞ |
n | ||
|
lim |
n→∞ |
1 | ||||
|
1 |
2 |
(3)原式=
lim |
n→∞ |
2+4+6++2n |
n2 |
lim |
n→∞ |
n(n+1) |
n2 |
lim |
n→∞ |
1 |
n |
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