x2 |
y-x |
y2 |
y-x |
A.-x-y | B.y-x | C.x-y | D.x+y |
x2 |
y-x |
y2 |
y-x |
x2-y2 |
y-x |
(x-y)(x+y) |
y-x |
x+1 |
x-1 |
x-1 |
x+1 |
A.1 | B.
| C.
| D.
|
b2 |
2a-b |
4a2 |
b-2a |
x2 |
xy |
x |
y |
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 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
2009×2011 |
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