已知平面向量 a→ 、 b→ 满足| a→ |=| b→ |=1， a→ • b→ = 12 ，若向量 c&#x21

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已知平面向量 a→ 、 b→ 满足| a→ |=| b→ |=1， a→ • b→ =

1

2

，若向量 c→ 满足| a→ ﹣ b→ + c→ |≤1，则| c→ |的最大值为（）

A：1

B： $\sqrt{2}$

C： $\sqrt{3}$

D：2

上一题下一题 0.0难度选择题更新时间:2017-02-23 06:05:55

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D

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