1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2009×2010 |
1 |
1+2 |
1 |
1+2+3 |
1 |
1+2+3+4 |
1 |
1+2+3+…+2009+2010 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2009×2010 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
2009 |
1 |
2010 |
2009 |
2010 |
1 |
1+2 |
1 |
1+2+3 |
1 |
1+2+3+4 |
1 |
1+2+3+…+2009+2010 |
1 |
2 |
1 |
3 |
1 |
2010 |
1 |
2011 |
2009 |
2011 |
27 |
34 |
8 |
9 |
3 |
20 |
a+b |
ab |
A.只有(1)正确 | B.只有(2)正确 |
C.(1)和(2)都正确 | D.(1)和(2)都不正确 |
1 |
2 |
1 |
2 |
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