1 |
2 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
6 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
12 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
(a-1)(a-2) |
1 |
(a-2)(a-3) |
1 |
(a-3)(a-4) |
1 |
(a-4)(a-5) |
1 |
2 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
6 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
12 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
a-1 |
1 |
a-2 |
1 |
a-2 |
1 |
a-3 |
1 |
a-3 |
1 |
a-4 |
1 |
a-4 |
1 |
a-5 |
1 |
a-1 |
1 |
a-5 |
4 |
(a-1)(a-5) |
x |
x2-25 |
5 |
x2+10x+25 |
4 |
x+2 |
3c |
ab |
4c |
ab |
7 |
ab |
a |
a-b |
b |
b-a |
a2 |
a+3 |
9 |
a+3 |
5 |
6ab |
2 |
3ac |
3 |
4abc |
M |
x2-y2 |
2xy-y2 |
x2-y2 |
x-y |
x+y |
A.
| B.
| ||||||||||||
C.
| D.
|
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