Page 14 - TestBook
P. 14
3
−2 � และ = �−2� จงหา
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ตัวอย่างที่ 2 กําหนด = � �����⃗
5
6
1) ถ้าจุด A คือ (1 , -2) จงหาจุด B 2) ถ้าจุด B คือ (-3 , 2) จงหาจุด A
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3) ถ้าจุด C คือ (1 , -2 , -7) จงหาจุด D 4) ถ้าจุด D คือ (-3 , -5 , 4) จงหาจุด C
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3 −2 −1
ตัวอย่างที่ 3 กําหนด � = �−2� , ̅ = � 4 � และ � = �−3� จงหา
4 2 5
1) 3� − ̅ 2) 2̅ − � − 3�
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ตัวอย่างที่ 4 ให้จุด A(1, 2, -5) , B(-3, -1, 2) , C(4, 2, 1) และ D(-2, -4, 3) จงหา
1) 2)
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3) 4) +
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