2 |
a2-1 |
1 |
1-a |
x2-2xy+y2 |
x2y-xy2 |
x2-y2 |
xy |
2 |
(a+1)(a-1) |
a+1 |
(a+1)(a-1) |
2-a-1 |
(a+1)(a-1) |
1 |
a+1 |
(x-y)2 |
xy(x-y) |
xy |
(x+y)(x-y) |
1 |
x+y |
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 |
m-2n |
mn |
n-m |
mn |
A.
| B.-
| C.x | D.1 |
1 |
x-4 |
8 |
x2-16 |
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