1 |
2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n×(n+1) |
1 |
2 |
1 |
6 |
1 |
12 |
1 |
n(n+1) |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
n(n+1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
n |
n+1 |
24 |
25 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2007×2008 |
1 |
2008×2009 |
12 |
m2-9 |
2 |
m+3 |
2b2 |
a+b |
2x+1 |
4x-1 |
x+1 |
1-4x |
5x-4 |
4x-1 |
1 |
1×3 |
1 |
2 |
1 |
3 |
1 |
3×5 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
5×7 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
2 |
1 |
7 |
3 |
7 |
1 |
x(x+3) |
1 |
(x+3)(x+6) |
1 |
(x+6)(x+9) |
1 |
a(a+1) |
1 |
(a+1)(a+2) |
1 |
(a+2)(a+3) |
1 |
(a+2006)(a+2007) |
x+1 |
y+1 |
y |
x |
A.0 | B.正数 |
C.负数 | D.以上情况都有可能 |
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