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82

เฉลย
ใบงานที่1

1. กำหนด U = { 1, 2, 3, … ,20 }

A = { 1, 5, 7, 12, 15, 20 }

B = { 2, 4, 5, 7, 15, 17, 18}
และ C = { 1, 3, 5, 7, 15, 19, 20 }

ให้เขียนเซตต่อไปนี้แบบแจกแจงสมาชิก
1) A ∪ B ∪ C

{ 1, 2, 3, 4, 5, 7, 12, 15, 17, 18, 19, 20 }

……………………………………………………………………………………………............................................................
2) A ∩ B ∩ C

{ 5, 7, 15 }
……………………………………………………………………………………………............................................................

3) (A ∪ B) ∩ C

{ 1, 5, 7, 15, 20 }
……………………………………………………………………………………………............................................................

4) (A ∩ B) ∪ C

{ 1, 3, 5, 7, 15, 19, 20 }
……………………………………………………………………………………………............................................................

5) (A − B) − C

{ 12 }
………………………………………………………………………………………..................................................................

6) A − (B − C)
{ 1, 5, 7, 12, 15, 20 }

……………………………………………………………………………………………............................................................
7) (A ∩ B) − C
′
{ 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18 }

…………………………………………………………………………………….....................................................................
8) (A ∪ B ) ∩ C
′
′
′
{ 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18 }
……………………………………………………………………………………………............................................................