x2 |
y-x |
y2 |
y-x |
A.-x-y | B.x-y | C.x+y | D.y-x |
x2-y2 |
y-x |
(x-y)(x+y) |
y-x |
4a2 |
2a-b |
b2 |
b-2a |
A.-2a-b | B.b-2a | C.2a-b | D.2a+b |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n(n+1) |
1 |
(x+1)(x+2) |
1 |
(x+2)(x+3) |
1 |
(x+3)(x+4) |
2a |
a+b |
2ab |
a2-b2 |
2x |
x2-4y2 |
1 |
x-2y |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×5 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
1×4 |
1 |
4×7 |
1 |
7×10 |
1 |
(3n-2)(3n+1) |
12 |
m2-9 |
2 |
m+3 |
A.
| B.
| C.
| D.
|
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