1+x |
1-x |
1+x |
1-x |
1-x |
1+x |
1+x |
1-x |
1+x |
1-x |
1+x |
1-x |
1+x |
1-x |
1+x |
1-x |
A.a=-1或3 | B.a=-1 | C.a>3或a<-1 | D.-1<a<3 |
|
A.(0,3) | B.[0,3] | C.(-∞,3] | D.[0,+∞) |
3 | ||
1-
|
A.(-∞,1] | B.(-∞,0)∪(0,1] | C.(-∞,0)∪(0,1) | D.[1,+∞) |
|
A.0 | B.
| C.
| D.3 |
1-x |
1+x |
2x+1 |
1 |
2x2-3x+1 |
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