1 |
4 |
(n-1)an |
n-an |
| ||||
|
|
1 |
4 |
(n-1)an |
n-an |
a2 |
2-a2 |
1 |
7 |
2a3 |
3-a3 |
1 |
10 |
1 |
3n-2 |
1 |
3k-2 |
(k-1)ak |
k-ak |
(k-1)×
| ||
k-
|
1 |
3(k+1)-2 |
1 |
3n-2 |
| ||||
|
1 |
3 |
3n+1 |
3n-2 |
1 |
3 |
4 |
7 |
4 |
3n+1 |
3n-2 |
1 |
3 |
3n+1 |
1 |
3 |
3n+1 |
|
3n+1 |
3n |
3n |
3n |
|
an |
an+1-an |
1 |
2 |
1 |
n |
1 |
n+1 |
1 |
n+2 |
1 |
n2 |
A.f(n)中共有n项,当n=2时,f(2)=
| ||||||
B.f(n)中共有n+1项,当n=2时,f(2)=
| ||||||
C.f(n)中共有n2-n项,当n=2时,f(2)=
| ||||||
D.f(n)中共有n2-n+1项,当n=2时,f(2)=
|
1 |
anan+1 |
4 |
25 |
A.13 | B.14 | C.15 | D.16 |
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