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已知向量和的夹角为120°,,则=________.
试题详情
已知向量
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAWCAYAAAD0OH0aAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACkSURBVDhP3VO5EQMhDFRdF6icy9UJsQpxSiEE
KmUt2RiOM3OMZxx4LCARu6sHQbi0grQnlAOGrgl+WxK2/dZg5Ib12ZBqmM8jfL+Gk+I6pX8nZHk9
oiBnAUl+63rtkkGZwGoVkCE+ARM8HoRQ7uDwhACj8YfhMwWzOuRgM1+9JlOeqJ8jdjEa03nmThTp
GHxPio7wbcS9O746aUZY/qAR8IPDdwc+xLsdewqvaAAAAABJRU5ErkJggg==
)
和
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAWCAYAAAD0OH0aAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACySURBVDhPrVO7EYUgEKQuA8oxv06Ir5CXUggB
pezjHsigHKBvZMbAYff2c2owPQFudwgNxswJ6TY4bPunwkw6WD8bXJF5rvB+hsvEtaURwVMJT37q
8qQQ2WKBR0OIYEuYz0dDiAy7Gp/MVoVsx4OORVpGVNIUgtiR0Iel/K4JZoJiR1obEvp2RMGCFU9J
QWnHE8ygANPZEXDN0qf+ZahbloaebHr5M7V7uAMWzP9f612FL960uYg38Ff7AAAAAElFTkSuQmCC
)
的夹角为120°,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGYAAAAWCAYAAAAy/emjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,则
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAC8AAAAWCAYAAABQUsXJAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFjSURBVFhH1ZcxksMgDEU5VwqOk56buOYg23IQ
FxxFK4Ex4BBLMAzrZZIiGfz1+PoiEwXT1g7be4N9oZ6aVouE9g1e7595koxeF7xSCvj3Czah/bwW
1fuu1wXPWvpk5+/h/yTzDoxxrKnP2ZB5MTZteG91zre24B9Dz8LjhoXAzhwXgSgBHLwzINKZ2A3q
tKzmLbwHq9OVaDBUKxbVlNbinD94Yzs12MHAn3Fo/T6UNnsLWmY7kgnh6QxhcBvCGQwdw5i19kh7
FiODUOmQt/PWAR9OWonFWOmzHbGo2LiPE6WYptjEz9/1euELJXI8g4feYLHxaGFrPyJDNabAO1OA
UaFrS1vfSfNyxLIG5cy4c55gigGr50o3XL92ooM8dO1yy7Dz0xWbDFNHJg0YdcYDvvrXNTIErrgr
cxA+5PPsChUpD9DPTk9U16lo6kfhx/gmP1XBT9ZeKDf3z8hCcCr1r+F/AQ5e5WVlj15MAAAAAElF
TkSuQmCC
)
=________.
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+
+
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|=2|
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与
的夹角为( )
A.60°
B.90°
C.120°
D.150°
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已知非零向量
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满足
+
+
=0,向量
与
夹角为120°,且|
|=2|
|,则向量
与
的夹角为( )
A.60°
B.90°
C.120°
D.150°
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已知非零向量
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满足
+
+
=0,向量
与
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|=2|
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的夹角为( )
A.60°
B.90°
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D.150°
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已知非零向量
,
,
满足
+
+
=0,向量
与
夹角为120°,且|
|=2|
|,则向量
与
的夹角为( )
A.60°
B.90°
C.120°
D.150°