6 |
a2-9 |
1 |
a+3 |
1 |
3-a |
A.相等 | B.互为倒数 | C.互为相反数 | D.M>N |
1 |
a+3 |
1 |
a-3 |
(a-3)-(a+3) |
(a+3)(a-3) |
-6 |
a2-9 |
x-18 |
x2-4 |
4 |
2-x |
x-18 |
(x-2)(x+2) |
4 |
x-2 |
x-18 |
(x-2)(x+2) |
4(x+2) |
(x-2)(x+2) |
2 |
x+3 |
2 |
3-x |
2x-18 |
x2-9 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
4 |
1 |
5 |
1 |
x(x+1) |
1 |
(x+1)(x+2) |
1 |
(x+2)(x+3) |
1 |
(x+3)(x+4) |
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 |
2×3 |
1 |
3×4 |
1 |
n(n+1) |
1 |
a |
1 |
b |
4 |
a+b |
b |
a |
a |
b |
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