1 |
x |
1 |
x |
f2(x)-2x |
2 |
S | 2n-1 |
S | 2n |
2Sn |
n |
1 |
n2 |
S2 |
2 |
S3 |
3 |
Sn |
n |
1 |
x |
1 |
x |
1 |
x |
2 |
x |
(x+1)2-2x |
x2+1 |
|
2n2-1 | ||
2
|
2n2+1 | ||
2
|
2n2+1 | ||
2
|
2n2-1 | ||
2
|
(
|
1 |
n |
1 |
n |
S | 2n-1 |
S | 2n |
2Sn |
n |
1 |
n2 |
S | 2n |
S | 2n-1 |
2Sn |
n |
1 |
n2 |
S | 2n-1 |
S | 2n-2 |
2Sn-1 |
n-1 |
1 |
(n-1)2 |
S | 22 |
S | 21 |
2S2 |
n |
1 |
22 |
S | 2n |
S2 |
2 |
S3 |
3 |
Sn |
n |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
1×2 |
1 |
2×3 |
1 |
n(n-1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n-1 |
1 |
n |
1 |
n |
S2 |
2 |
S3 |
3 |
Sn |
n |
a |
x |
2 |
b |
x |
2 |
1 |
4 |
a |
b |
π |
2 |
π |
2 |
x2 |
ax+b |
(k+1)x-k |
2-x |
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