(本小题满分13分)已知三点A(3,0),B(0,3),C,.(1)若,求角;(2)若,求的值.-高三数学

题目简介

(本小题满分13分)已知三点A(3,0),B(0,3),C,.(1)若,求角;(2)若,求的值.-高三数学

题目详情

(本小题满分13分)
已知三点A(3,0),B(0,3),C
(1)若,求角
(2)若,求的值.
题型:解答题难度:中档来源:不详

答案

解:(1) ∵···························· 2分
········································ 4分
整理得
····························································································· 6分
      ∴·································································· 7分
(2) ∵
····························································· 8分
····················································································· 9分
     
················································································· 10分
································· 13分

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