1 |
2 |
3 |
4 |
π |
3 |
π |
12 |
π |
2 |
1 |
2 |
|
4 |
3 |
3 |
4 |
1 |
2 |
π |
3 |
1 |
2 |
π |
3 |
1 |
2 |
31 |
4 |
π |
12 |
π |
2 |
π |
6 |
π |
3 |
2π |
3 |
1 |
2 |
π |
3 |
1 |
2 |
1 |
2 |
35 |
4 |
2 |
x |
11 |
3 |
2 |
3 |
4 |
11 |
12 |
| ||
2 |
|
A.(-∞,1) | B.(-∞,0) | C.(1,+∞) | D.(2,+∞) |
A.可能为0 | B.恒大于0 | C.恒小于0 | D.可正可负 |
a+3 |
a-3 |
A.(-∞,0) | B.(0,3) | C.(0,+∞) | D.(-∞,0)∪(3,+∞) |
|
4 |
3 |
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