4-x2 |
4-x2 |
A.(1,-1) | B.{x=1}∪{y=-1} | C.{1,-2} | D.{1,-1} |
A.[-1,+∞﹚ | B.(-1,+∞﹚ | C.(-∞,-1] | D.(-∞,-1) |
A.{-1,3} | B.{0,1} | C.{-1,2,3} | D.{-1,0,3} |
A.P∪Q | B.P∩Q | C.∁uP∪∁uQ | D.∁uP∩∁uQ |
1+i |
1-i |
A.{1±i,-1±i} | B.{1,0,-1} | C.{1±i,0,-1±i} | D.Φ(空集) |
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