A.
| B.
| ||||||||||||
C.
| D.
|
b |
a |
b-1 |
a |
b-b+1 |
a |
1 |
a |
1 |
x-y |
1 |
y-x |
1 |
x-y |
1 |
x-y |
5 |
2x |
5 |
2y |
5y+5x |
2xy |
x |
a |
x |
b |
bx+ax |
ab |
x(a+b) |
ab |
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 |
x2 |
x-y |
y2 |
x-y |
x |
x-y |
y |
y-x |
4 |
x2-4 |
1 |
x+2 |
1 |
2-x |
a |
a-b |
b |
a-b |
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