x2-3x |
9-x2 |
x3-3x |
9-x2 |
x(x-3) |
(3+x)(3-x) |
x |
3+x |
-3x+1 |
-x2+7x-2 |
A.
| B.
| ||||
C.
| D.
|
A.
| B.
| ||||||||
C.
| D.
|
16a2-b2 |
4a+b |
16a2-b2 |
4a+b |
(4a+b)(4a-b) |
4a+b |
16a2-b2 |
4a+b |
(16a2-b2)(4a-b) |
(4a+b)(4a-b) |
A.都正确 | B.小明正确,小华不正确 |
C.小华正确,小明不正确 | D.都不正确 |
a |
b |
c |
d |
e |
f |
1 |
2 |
a-3c+2e |
2b-6d+4f |
A.
| B.
| C.
| D.
|
x |
x(x-y) |
1 |
( ) |
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