题目
题型：不详难度：来源：
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答案
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∴
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∵
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∴
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解得p=-50
故答案为：-50
核心考点
试题【已知|a| =1 ， |b| =2，向量a和b的夹角为120°，向量c=2a+3b，d=p•a-5b，且c与d垂直，则实数p=______．】；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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题型：
|sinθ，如果|
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•
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×
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