1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n(n+1) |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2009×2010 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
n |
1 |
n+1 |
n+1 |
n(n+1) |
n |
n(n+1) |
n+1-n |
n(n+1) |
1 |
n(n+1) |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2009×2010 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2009 |
1 |
2010 |
1 |
2010 |
2009 |
2010 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
2 |
1×2 |
2 |
2×3 |
2 |
3×4 |
2 |
n×(n+1) |
2 |
x+3 |
2 |
3-x |
2x+18 |
x2-9 |
1 |
b |
1 |
c |
1 |
a |
1 |
c |
1 |
a |
1 |
b |
x-y |
x+y |
2x+1 |
(x-1)(x+2) |
A |
x-1 |
B |
x+2 |
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