1 |
ab |
1 |
(a+1)(b+1) |
1 |
(a+2)(b+2) |
1 |
(a+2007)(b+2007) |
1 |
ab |
1 |
(a+1)(b+1) |
1 |
(a+2)(b+2) |
1 |
(a+2007)(b+2007) |
1 |
2 |
1 |
3×2 |
1 |
4×3 |
1 |
2009×2008 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2008 |
1 |
2009 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2008 |
1 |
2009 |
1 |
2009 |
2008 |
2009 |
2 |
(-1)n-1 |
1 |
2 |
1 |
2 |
A.第一象限 | B.第二象限 | C.第三象限 | D.第四象限 |
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