设U = {1,2,3; 4、5、6、7、8、9}，A = {1、2、3、4}，B = {2、4、6、8}和C = {3、4、5、6}，求出(B-C)'的值。
U = {1, 2, 3; 4, 5, 6, 7, 8, 9}, A = {1, 2, 3, 4}, B = {2, 4, 6, 8} 和 C = {3, 4, 5, 6}.
(B-C) = 2 – 8
(B-C) ’= {1,3,4,5,6,7,9}
更新:20210423 104156
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发布时间：2020-09-13 13:54:46 作者：冬青好
U = {1, 2, 3; 4, 5, 6, 7, 8, 9}, A = {1, 2, 3, 4}, B = {2, 4, 6, 8} 和 C = {3, 4, 5, 6}.
(B-C) = 2 – 8
(B-C) ’= {1,3,4,5,6,7,9}
更新:20210423 104156.
