已知A=(2,-4,-1),B=(-1,5,1),C=(3,-4,1),若a=CA,b=CB,则a+b对应的点为()A.(5,-9,2)B.(-5,9,-2)C.(5,9,-2)D.(5,-9,-2)

题目简介

已知A=(2,-4,-1),B=(-1,5,1),C=(3,-4,1),若a=CA,b=CB,则a+b对应的点为()A.(5,-9,2)B.(-5,9,-2)C.(5,9,-2)D.(5,-9,-2)

题目详情

已知A=(2,-4,-1),B=(-1,5,1),C=(3,-4,1),若==,则对应的点为(  )
A.(5,-9,2)B.(-5,9,-2)C.(5,9,-2)D.(5,-9,-2)
题型:单选题难度:偏易来源:不详

答案

B

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