a |
b |
a |
b |
a |
b |
A.1 | B.-1 | C.0 | D.(-2,2) |
a |
5 |
b |
5 |
a |
b |
a |
b |
a |
b |
2ab |
|a|2+|b|2 |
A.(-∞,
| B.[0,
| C.[-
| D.[
|
a |
b |
1 |
9 |
c |
d |
1 |
4 |
|
A.2 | B.3 | C.
| D.±
|
a |
b |
π |
3 |
a |
1 |
2 |
b |
a |
b |
A.1 | B.2 | C.
| D.2
|
a |
b |
c |
a |
b |
c |
0 |
a |
b |
a |
c |
b |
A.
| B.5 | C.4 | D.
|
AB |
AC |
A.-4 | B.4 | C.-8 | D.8 |
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