A.(0,2) | B.(-2,0)∪(2,4) | C.(-4,0) | D.(-4,-2)∪(0,2) |
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A.一切实数 | B.(-3,3] | C.(-∞,-3) | D.(-∞,3) |
A.[-1,5] | B.[-5,1] | C.[5,+∞)∪(-∞,-1] | D.(-∞,-5]∪[1,+∞) |
A.f(x)=|x| | B.f(x)=
| C.f(x)=2x | D.f(x)=x2 |
x-3 |
x |
x-3 |
x |
A.(0,3) | B.(-∞,0) | C.(3,+∞) | D.(-∞,0)∪(0,+∞) |
A.{x|-1≤x≤1} | B.{x|-2≤x≤2} | C.{x|0≤x≤2} | D.{x|-2≤x≤0} |
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