1 |
a |
2 |
b |
A.(-∞,
| B.(-∞,3] | C.(-∞,6] | D.(-∞,3+2
|
1 |
a |
2 |
b |
1 |
2 |
1 |
a |
2 |
b |
1 |
2 |
b |
a |
2a |
b |
1 |
2 |
|
3 |
2 |
2 |
b |
a |
2a |
b |
2 |
| ||
2 |
2+
| ||
2 |
3 |
2 |
2 |
3 |
2 |
2 |
3 |
2 |
2 |
3 |
2 |
2 |
4 |
x+1 |
cosθ |
a |
sinθ |
b |
A.a2+b2≤1 | B.a2+b2≥1 | C.
| D.
|
2 |
x |
A.1 | B.
| C.
| D.2 |
A.8 | B.6 | C.2
| D.3
|
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