4x2y |
6xy2 |
x2-4 |
xy+2y |
4x2y |
6xy2 |
2x•2xy |
3y•2xy |
2x |
3y |
x2-4 |
xy+2y |
(x+2)(x-2) |
y(x+2) |
x-2 |
y |
0.3x+0.2y |
0.05x-y |
a-
| ||||
|
-a+b |
-c |
a+b |
c |
-a+b |
-c |
b-a |
c |
-a+b |
-c |
a-b |
c |
A.0个 | B.1个 | C.2个 | D.3个 |
0.3a+0.02b |
0.1c-0.03d |
a2-4 |
a2-4a+4 |
A.
| B.
| ||||||||
C.
| D.
|
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