1. ใบงานที่ 2
ชื่อ.....................................................................................ชั้น.....................เลขที่...........
1.
กำหนดให้ A 1, 3, 6, 9 และ B 2, 4, 6, 8 จงเขียนควำมสัมพั น ธ์ต่อไปนี้ แบบแจกแจง
สมำชิกและแบบบอกเงื่อนไข
1) r1 เป็ นควำมสัมพันธ์ “มำกกว่ำ” จำก A ไป B
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2) r2 เป็ นควำมสัมพันธ์ “น้ อยกว่ำ” จำก A ไป B
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3) r3 เป็ นควำมสัมพันธ์ “หำรลงตัว” จำก A ไป B
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4) r4 เป็ นควำมสัมพันธ์ “หำรลงตัว” จำก B ไป A
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2. จงเขียนกรำฟของควำมสัมพันธ์ท่กำหนดให้ ต่อไปนี้
ี
1) r1 = {(2, 6), (2, 5), (2, 4), (3, 6), (3, 7)}

2. 2
2) r2 = {(x, y)
A By
3) r3 = {(x, y)
A A x+ y = 4}
x }, A={1, 2, 3}, B = {1, 2}
เมื่อกำหนด
2. จงเขียนกราฟของความสัมพันธ์ที่กาหนดให้ต่อไปนี้
1) r1 = {(x, y)
R
R y = x}
A={1, 2, 3, 4, 5}

3. 3
2) r2 = {(x, y)
R
R y = 2x - 1}
3) r3 = {(x, y)
R
Ry=
4) r4 = (x, y) 1
y
4
1 2
x }
2