1 |
1+2 |
1 |
1+2+3 |
1 |
1+2+3+4 |
1 |
1+2+3+…+n |
1 |
1+2+3+…+n |
2 |
n(n+1) |
1 |
n-1 |
1 |
n |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n-1 |
1 |
n |
2n |
n+1 |
2n |
n+1 |
A.0 | B.1 | C.2 | D.-2 |
5 |
6 |
1 |
1×2 |
1 |
2×3 |
1 |
n(n+1) |
1 |
2012×2013 |
A.
| B.
| C.
| D.
|
1 |
2 |
|sinn| |
sinn |
(-1)f(2) |
a1a2 |
(-1)f(3) |
a3a4 |
(-1)f(4) |
a5a6 |
(-1)f(n+1) |
a2n-1a2n |
1 |
6 |
5 |
24 |
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