|x|-3 |
A.{x|-3≤x≤3} | B.{x|x≤-3或x≥3} | C.{x|x≤-3} | D.{x|x≥3} |
|x|-3 |
A.[1,3],[0,1] | B.[-1,1],[0,1] | C.[-1,1],[-2,-1] | D.[1,3],[-2,-1] |
a |
b |
u |
a |
b |
u |
A.
| B.
| C.1 | D.
|
A.[-1,1] | B.[0,2] | C.[-2,0] | D.[0,1] |
| ||
2x2-3x-2 |
A.(-∞,1] | B.(-∞,21] | ||||||||
C.(-∞,-
| D.(-∞,-
|
A.[-1,2) | B.[-1,1] | C.(-2,2) | D.[-2,2) |
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