2a |
a2-4 |
1 |
2-a |
1 |
2 |
2a |
(a+2)(a-2) |
1 |
a-2 |
2a-(a+2) |
(a+2)(a-2) |
a-2 |
(a+2)(a-2) |
1 |
a+2 |
1 |
2 |
2 |
5 |
x+1 |
x |
1+x2 |
2x |
2 |
1 |
m |
1 |
n |
1 |
m+n |
n |
m |
m |
n |
A.1 | B.-1 | C.0 | D.2 |
2x |
x2-4 |
1 |
x-2 |
x |
x+2 |
1 |
2008 |
5 |
a-2 |
a-3 |
2a-4 |
x |
x-y |
y2 |
x+y |
x4y |
x4-y4 |
x2 |
x2+y2 |
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