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AuB=<-3,+∞)
AuBuC=R=(-∞,+∞)
AnB=(1,3>
AnBnC=(1,2)
b)
AuB=<1,+∞)
AuBuC=<1,+∞)
AnB=(4,5>
AnBnC={Ф} zbior pusty