2 |
x+3 |
2 |
3-x |
2x-18 |
x2-9 |
2 |
x+3 |
2 |
3-x |
2x-18 |
x2-9 |
2x-6+2x+6+2x-18 |
x2-9 |
6x-18 |
x2-9 |
6(x-3) |
(x+3)(x-3) |
6 |
x+3 |
6 |
x+3 |
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 |
x-3 |
x2-1 |
2 |
1+x |
x-3 |
(x+1)(x-1) |
2(x-1) |
(x+1)(x-1) |
1 |
n |
1 |
2n |
1 |
3n |
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