题目
题型：不详难度：来源：
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答案
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所以（2
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又因为向量
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所以可得2k=12，解得k=6．
故答案为6．
核心考点
试题【已知向量a、b均为单位向量，且a⊥b．若（2a+3b）⊥（ka-4b），则k的值为______．】；主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
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①向量
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题型：
|sinθ，如果|
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•
=-2，则|
×
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