题目
题型：苏州模拟难度：来源：
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答案
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又|
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∴cosθ=
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故答案为：45°．
核心考点
试题【已知向量a=（2，1），b=（1，3）则a与b的夹角为______．】；主要考察你对平面向量模和夹角的坐标表示等知识点的理解。[详细]
举一反三
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