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2012-12-18T23:19:40-02:00

       A={Xє N/X≤5} =     {0,1,2,3,4,5}      

B={xЄ Z/-3<x≤1} = {-2,-1,0,1}   

  C={XЄN/2X +1=5}  = { XЄN/X=   2}             

  D={XЄ Z*/X²-2X=0} = { D={XЄ Z*/X =2}                                                                                                                                                                                                                                                                                                                                                                     

3 5 3