2a |
x+a |
2a |
x+a |
2a |
x+a |
2a |
x+a |
2a |
x+a |
a-x |
x+a |
2a |
x+a |
x+3a |
x+a |
A.a≥-4 | B.a≤-4 | C.a≤4 | D.a≥4 |
A.(0,2) | B.(-2,0)∪(2,4) | C.(-4,0) | D.(-4,-2)∪(0,2) |
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 |
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