a |
b |
c |
d |
a |
c |
b |
d |
a+b |
b |
c+d |
d |
a+b |
a-b |
c+d |
c-d |
1 |
2 |
3 |
6 |
1 |
3 |
2 |
6 |
1+2 |
2 |
3+6 |
6 |
3 |
2 |
1+2 |
1-2 |
3+6 |
3-6 |
a |
b |
c |
d |
a |
b |
c |
d |
a+b |
b |
c+d |
d |
1 |
a |
1 |
b |
a-2ab-b |
2a+7ab-2b |
5-2y+2y2 |
-x2+2x+2 |
3x2-3xy |
xy-y2 |
3x |
() |
x2 |
x2+x |
x |
1+x |
A.x≠-1或x≠0 | B.x≠-1 | C.x≠-1且x≠0 | D.x≠0 |
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