n(an-a1) |
2 |
lim |
n→∞ |
an-1 |
an+1 |
n(an-a1) |
2 |
1×(a1-a1) |
2 |
n(an-a1) |
2 |
nan |
2 |
(n-1) •an-1 |
2 |
nan |
2 |
(n-1) •an-1 |
2 |
an |
an-1 |
n-1 |
n-2 |
an-1 |
an+1 |
(pn-p)-1 |
(pn-p)+1 |
lim |
n→∞ |
(pn-p)-1 |
(pn-p)+1 |
an-1 |
an+1 |
3 |
2 |
7 |
2 |
9 |
(2an-7)(2an-1) |
k |
57 |
A.公差为3的等差数列 | B.公差为4的等差数列 |
C.公差为6的等差数列 | D.公差为9的等差数列 |
cn |
bn |
A.若∀n∈N*总有
| ||||
B.若∀n∈N*总有
| ||||
C.若∀n∈N*总有
| ||||
D.若∀n∈N*总有
|
x2 |
a2 |
y2 |
b2 |
A.a7+a9>0 | B.a7+a9<0 | C.a7+a9=0 | D.a7•a9=0 |
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