1-x |
x-3 |
A.{x|x≤3} | B.{x|x>3或x≤1} | C.{x|1≤x≤3} | D.{x|1≤x<3} |
1-x |
x-3 |
|
1-3x |
A.{x|x>
| B.{x|x≥
| C.{x|x≤
| D.{x|x<
|
1 |
2 |
1 |
x |
1 |
2 |
A..(-∞,2) | B..(2,+∞) | C..(0,2) | D.(-∞,0)∪(2,+∞) |
1 |
x |
A.{x|x<1} | B.{x|x<-1或x>1} |
C.{x|-1<x<1} | D.{x|-1<x<0或x>1} |
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