a |
2 |
b |
3 |
c |
4 |
3a-2b+c |
a+b+c |
a |
2 |
b |
3 |
c |
4 |
3a-2b+c |
a+b+c |
6k-6k+4k |
2k+3k+4k |
4k |
9k |
4 |
9 |
4 |
9 |
-a-b |
c-d |
a+b |
-c+d |
-a-b |
c+d |
a+b |
c+d |
-a-b |
c-d |
a+b |
-c-d |
-a-b |
c-d |
-a-b |
c+d |
A.1个 | B.2个 | C.3个 | D.4个 |
x+
| ||
|
-a |
a-b |
A.
| B.
| C.-
| D.-
|
A.
| B.
| ||||||||
C.
| D.
|
a2+ab |
a2-b2 |
18 |
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