x2 |
4 |
A.[0,+∞) | B.[-2,2] | C.[0,2] | D.∅ |
x2 |
4 |
A.M⊆N | B.N⊆M | C.M∩N={2,3} | D.M∪N={1,4} |
A.{1} | B.{2} | C.{4} | D.{1,2,4} |
A.{x|x≥1或x≤2} | B.{x|0<x≤2} | C.{x|0≤x≤2} | D.∅ |
A.∅ | B.{0,1} | C.{0,1,4} | D.{0,1,2,3,4} |
A.(-∞,-2) | B.(-∞,-2] | C.(4,+∞) | D.[4,+∞) |
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