2x |
|x|+1 |
A.1个 | B.3个 | C.2个 | D.0个 |
2x |
|x|+1 |
2x |
|x|+1 |
A.[0,1] | B.[0,1) | C.(-∞,1] | D.(-∞,1) |
A.{x|0<x<2} | B.{x|1<x<2} | C.{x|x>2} | D.{x|x>1} |
A.{-1,0,1} | B.{-1,1} | C.{-1} | D.{1,0} |
πx |
3 |
1 |
2 |
A.{-1,1,5} | B.{-1,1,5,7} |
C.{-5,-1,1,5,7} | D.{-5,-1,1,5,} |
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