a2-1 |
1-2a+a2 |
a2-1 |
1-2a+a2 |
(a+1)(a-1) |
(a-1)2 |
a+1 |
a-1 |
2013+1 |
2013-1 |
1007 |
1006 |
1007 |
1006 |
x-2 |
x+a |
1 |
a |
3 |
m |
b |
3 |
c |
a-b |
a+b |
2b |
3 |
4 |
x2+2x+1 |
5 |
m-n |
m+n |
A.4 | B.5 | C.6 | D.7 |
5 | ||
|
x-2 |
x2+1 |
A.x<2 | B.x≤2 | C.x>2 | D.x≥2 |
x2-4 |
x+2 |
A.2 | B.-2 | C.±2 | D.0 |
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