a |
b |
c |
a |
b |
a |
c |
a |
c |
a |
b |
a |
b |
a |
b |
1 |
2 |
a |
b |
a |
b |
1 |
2 |
a |
c |
a |
c |
a |
c |
c |
1 |
2 |
A.1 | B.2 | C.4 | D.8 |
a-x |
x+b |
A.{x|x>a} | B.{x|x<-b,或x>a} |
C.{x|x<a,或x>-b} | D.{x|-b<x<a} |
A.[4,+∞) | B.[-12,4] | C.(-∞,-12] | D.{-12} |
x-3 |
x+2 |
A.(-2,3) | B.(-∞,-2) | C.(-∞,-2)∪(3,+∞) | D.(3,+∞) |
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