{2, 4, 5, 7, 8}
BnC= {6}
BUC = {2, 4, 5, 7, 8}
BUC = {6}
互いに等しい集合は
BnC=
BUC, BNC= BUC
百44
D
(2) ANB= {x|-3<x<-2}
1UD
1U
練習45 a= 4, 6= 16 または a=-3, b=-5
練習46(1)ANBNC={6, 12}
(2) AUBUC= {1, 2, 3, 4, 6, 8, 9, 10,
12, 14, 15, 16, 18, 20}
(3) BU(ANC)
= {2, 3, 4, 6, 9, 12, 15, 18}
(4)(BUA)n (BUC)
三
= {2, 3, 4, 6, 9, 12, 15, 18}
練習 47 (1) 偽 (反例)x= -2
ニ