1+a |
1-a |
1+a |
1-a |
1-3 |
1-(-3) |
1 |
2 |
1 |
2 |
1+(-
| ||
1-(-
|
1 |
3 |
1 |
3 |
1+
| ||
1-
|
1+2 |
1-2 |
1 |
2 |
1 |
3 |
1+0 |
1-0 |
1+a |
1-a |
1+a |
1-a |
1+3 |
1-3 |
1+(-2) |
1-(-2) |
1 |
3 |
1 |
3 |
1+(-
| ||
1-(-
|
1 |
2 |
1 |
2 |
1+
| ||
1-
|
A.4 | B.3 |
C.1 | D.与a的取值有关 |
A.①④ | B.②③ | C.①② | D.③④ |
ai |
bi |
bi |
ai |
aj |
bj |
bj |
aj |
3 |
4 |
2 |
3 |
A.
| B.
| C.
| D.
|
A.1 | B.2 | C.3 | D.4 |
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