100 |
n=1 |
2012 |
n=1 |
1 |
n(n+1) |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
2012 |
n=1 |
1 |
n(n+1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2011 |
1 |
2012 |
1 |
2012 |
1 |
2013 |
1 |
2013 |
2012 |
2013 |
2012 |
2013 |
2 |
x |
5 |
x2 |
a+1 |
a-1 |
a-1 |
a+1 |
x |
y |
y |
x |
x2+y2 |
xy |
2 |
x2-4 |
1 |
2x-4 |
1 |
1-x |
1 |
1+x |
1 |
1-x |
1 |
1+x |
2 |
1+x2 |
4 |
1+x4 |
7 |
3n |
p |
mn |
p2 |
x2+5x |
x-1 |
2x2+4x |
x2-x |
|a-2| |
a-2 |
a-1 |
|1-a| |
a |
|a| |
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