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5

123456

456321

(184-1918)

,

...

7

- U = {1,2,3,4,5,6,7}, A = {1,2,5}, B = {2,4,7} C = {4,5,6} , () A B = B A() (AB ) = A B() (A C) =A C

,

AB

2

3 4 5

3 6

31243564AB

A = { }

B = { }

AB

=

{1, 2, 3}{x, y, z}{x, y, z,1,2,3}

c12bc56bAB,cbC

14

{5,b,2,c,9}{ b, c, 2 }

A = { a, b, c, 2, 3 } B = { 5, b, 2, c, 9 } {a,b,c,2,3}A B

1.

2.

?? { p, q, r}{ x, y, z}{ d,g,q,r}{ g, q, z}

? ?3

?{2, 3, 4, 5 }{ 3, 4, 5,6 }

U = { 1, 7, 8, 9, 10, a, b, c, d } , A={b, 1, 8, c, 10} B ={a, b, d, 8, 9} () A\B () A B = ?() A B = ?