1 |
a-2 |
4 |
a2-4 |
1 |
a-2 |
4 |
a2-4 |
a+2 |
(a+2)(a-2) |
4 |
(a+2)(a-2) |
a+2-4 |
(a+2)(a-2) |
a-2 |
(a+2)(a-2) |
1 |
a+2 |
1 |
a+2 |
1 |
2 |
1 |
1×2 |
1 |
2 |
1 |
3 |
1 |
2×3 |
1 |
3 |
1 |
4 |
1 |
3×4 |
1 |
n |
1 |
n+1 |
1 |
n(n+1) |
1 |
2×3 |
1 |
3×4 |
1 |
4×5 |
1 |
x(x+1) |
2 |
a2-1 |
1 |
1-a |
x2-2xy+y2 |
x2y-xy2 |
x2-y2 |
xy |
A.
| ||||||
B.
| ||||||
C.
| ||||||
D.
|
1 |
1-x |
1 |
1+x |
2 |
1+x2 |
4 |
1+x4 |
1+x |
3x2-2x-1 |
A |
3x+1 |
B |
x-1 |
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