Ответ:

1) AuB {2,3,8,11}       

    AuC {2,3,5,8,11}

    BuC {2,3,5,8,11} 

2) AnB{2,3,8}

    AnC{…}

    CnB{11} 

Ответ:

AuB={2,3,8,11}

AuC={2,3,5,8,11}

BuC={2,3,5,8,11}

AnB={2,3,8}

AnC={}

CnB={11}