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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| 16+144-6×(-8) |
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故答案为：4
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核心考点
试题【已知向量a与b的夹角为120°，且|a|=|b|=4，那么|a-3b|等于______．】；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|
|=4，|
|=3，
•
=-2，则|
×
|=______．
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