1. ใบงานที่ 1
ชื่อ.....................................................................................ชั้น.....................เลขที่...........
1. จงสร้ างคู่ อัน ดั บ ทุ ก คู่ โดยสมาชิ กตั วหน้ าเป็ นสมาชิ ก ของ A และสมาชิ ก ตั วหลั งเป็ นสมาชิ ก
ของ B เมื่อกาหนดให้
1) A = {1, 2, 3} และ B = {- 1, 0, 1}
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2) A = {- 7, 1, 5} และ B = {2, 3}
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2. จงหาค่า x และ y จากคู่อนดับที่กาหนดให้ ต่อไปนี้
ั
1) (x, 3) = (2, y)
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2) (x + y, 1) = (5, x - y)
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3) (x - 1, y + 2) = (5, 3)
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3. จงหา A ´ B และ B ´ A เมื่อกาหนด A และ B ดังนี้
1) A = {a, b} และ B = {c, d, e}
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2) A = {- 3, - 2, - 1} และ B = {2, 3}
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2. 2
3) A = {x Î I x - 9 = 0}และ B = {x Î I x + 1 = 0}
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4) A = {1, 2, 3} และ B = {x Î I x = 4}
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4. กาหนดให้ A = {1, 2, 3, ..., 10} และ B = {a, b, c} จงหาจานวนสมาชิกของ
1) A ´ B
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2) B ´ A
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3) A ´ A
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4) B ´ B
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