题目
题型：不详难度：来源：
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| π |
| 3 |
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答案
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| b |
| a |
| b |
∵向量
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| b |
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| π |
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| a |
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∴
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| a |
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| a |
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| π |
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| 3 |
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| π |
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∴|
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1+22+32+0+2×
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| 23 |
故答案为
| 23 |
核心考点
试题【设向量a⊥b，＜a，c＞=＜b，c＞=π3且|a|=1，|b|=2，|c|=3，则|a+b+c|=______．】；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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| A．若a•b=0，则|a|=0，或|b|=0 | ||||
| B．若|a|=|b|，则向量a与向量b是相等向量或相反向量 | ||||
C．向量
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| D．若向量a，b共线，则a•b=|a 题型：b| |
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| O′P′ |
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A．-2(
| B．2(
| C．-(
| D．
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