lim |
n→∞ |
an |
bn |
lim |
n→∞ |
b1+b2+…+bn |
na2n |
lim |
n→∞ |
an |
bn |
lim |
n→∞ |
a1+(n-1)d1 |
b1+(n-1)d2 |
d1 |
d2 |
lim |
n→∞ |
b1+b2+…+bn |
na2n |
lim |
n→∞ |
nb1+
| ||
n[a1+(2n-1)d1 ] |
| ||
2×d1 |
d2 |
4d1 |
1 |
8 |
1 |
8 |
n+2 |
n |
an |
n(n+1) |
1 |
2 |
1 |
a1 |
1 |
a2 |
1 |
an |
2n+1 |
3 |
2 |
A.-3 | B.
| C.6 | D.
|
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