试题与答案

已知a=(1,2),b=(1,-1)(1)若θ为2a+b与a-b的夹角,求θ的值

题型:解答题

题目:

已知
a
=(1,2),
b
=(1,-1)
(1)若θ为2
a
+
b
a
-
b
的夹角,求θ的值;
(2)若2
a
+
b
与k
a
-
b
垂直,求k的值.

答案:

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