题目
题型：不详难度：来源：
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答案
| a |
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| a |
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| a |
| b |
| a |
| b |
| a |
| b |
∴|
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| b |
| 7 |
故答案为
| 7 |
核心考点
试题【已知：|.a|=1，|.b|=2，＜a，b＞=60°，则|a+b|=______．】；主要考察你对平面向量数量积的运算等知识点的理解。[详细]
举一反三
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=(2，0)，那么
=（ ）| . |
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| 7 |
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| . |
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=(2，0)，那么=（ ）