3 |
2a-4 |
4 |
a2-4 |
3 |
2(a-2) |
4 |
(a+2)(a-2) |
3(a+2)-8 |
2(a+2)(a-2) |
3a-2 |
2(a+2)(a-2) |
3a-2 |
2(a+2)(a-2) |
1 |
a |
1 |
a |
2 |
a |
a2 |
a-b |
b2 |
b-a |
A.
| B.a+b | C.a-b | D.b-a |
2010 |
2009×2011 |
2011 |
2010×2012 |
1 |
2011 |
A.a<b<c | B.c<b<a | C.b<a<c | D.c<a<b |
100 |
n=1 |
50 |
n=1 |
2013 |
n=1 |
1 |
n(n+1) |
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