3x |
x-4y |
x+y |
4y-x |
7y |
x-4y |
3x-x-y-7y |
x-4y |
2(x-4y) |
x-4y |
2a |
a2-4 |
1 |
2-a |
x2 |
x-1 |
1 |
1-x |
a2-2a+1 |
a-1 |
m |
m-n |
n |
m+n |
2mn |
m2-n2 |
A.
| B.
| ||||||||||||
C.
| D.
|
2xy-y2 |
x2-y2 |
x-y |
x+y |
m |
x2-y2 |
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 |
(2n-1)×(2n+1) |
a+2 |
a-2 |
a-2 |
a+2 |
8a |
a2-4 |
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