|
1 |
3 |
3 |
4 |
AB |
BC |
1 |
3 |
1 |
3 |
| ||
2 |
3 |
4 |
3 |
4 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
4 |
1 |
2 |
| ||
2 |
1 |
2 |
1 |
3 |
3 |
4 |
| ||
2 |
| ||
2 |
1 |
2 |
AB |
OB |
OA |
BC |
OC |
OB |
AB |
BC |
kx+7 |
kx2+4kx+3 |
1-|x| |
A.(-∞,-1]∪[1,+∞) | B.(-∞,1] | C.(-1,1) | D.[-1,1] |
1+x |
1-x |
A.a=-1或3 | B.a=-1 | C.a>3或a<-1 | D.-1<a<3 |
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