a2 |
a-b |
b2 |
a-b |
A.a+b | B.a-b | C.a2-b2 | D.1 |
a2-b2 |
a-b |
(a+b)(a-b) |
a-b |
x |
x-1 |
a+b |
ab |
A.
| B.
| C.
| D.
|
A.
| B.
| ||||||||||||
C.
| D.
|
1 |
1×3 |
1 |
2 |
1 |
3 |
1 |
3×5 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
5×7 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
2003×2005 |
1 |
2 |
1 |
2003 |
1 |
2005 |
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
2003×2005 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
2003 |
1 |
2005 |
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
x(x+2) |
1 |
(x+2)(x+4) |
1 |
(x+4)(x+6) |
1 |
(x+2004)(x+2006) |
a |
b |
b |
a |
a2+b2 |
ab |
A.0 | B.-
| C.-
| D.
|
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