题目内容：
两个非零向量a和b，若∣a∣=∣b∣=∣a-b ∣，则a与a+b的夹角为_______.参考答案：
答案解析：
填空题：两个非零向量a和b，若∣a∣=∣b∣=∣a-b ∣，则a与a+b的夹角为_______.
- 题目分类：小学数学
- 题目类型：填空题
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