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若向量a.b.c两两所成的角相等.且|a|=2.|b|=2.|c|=6.则|a+b+c|=
若向量a.b.c两两所成的角相等.且|a|=2.|b|=2.|c|=6.则|a+b+c|=
发布时间:2021-02-20 12:10:34
若向量
a,
b,
c两两所成的角相等,且|
a|=2,|
b|=2,|
c|=6,则|
a+
b+
c|=( )
A.4
B.10
C.4或10
D.2或
10
网友回答
答案:
分析:
由题意可得任意两个向量的夹角为0或
2π
3
.分别求出|
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