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已知向量、均为单位向量,若它们的夹角120°,则|+3|等于A.B.C.D.4
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==
)
、
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAWCAYAAAD0OH0aAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACySURBVDhPrVO7EYUgEKQuA8oxv06Ir5CXUggB
pezjHsigHKBvZMbAYff2c2owPQFudwgNxswJ6TY4bPunwkw6WD8bXJF5rvB+hsvEtaURwVMJT37q
8qQQ2WKBR0OIYEuYz0dDiAy7Gp/MVoVsx4OORVpGVNIUgtiR0Iel/K4JZoJiR1obEvp2RMGCFU9J
QWnHE8ygANPZEXDN0qf+ZahbloaebHr5M7V7uAMWzP9f612FL960uYg38Ff7AAAAAElFTkSuQmCC
)
均为单位向量,若它们的夹角120°,则|
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAWCAYAAAD0OH0aAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACkSURBVDhP3VO5EQMhDFRdF6icy9UJsQpxSiEE
KmUt2RiOM3OMZxx4LCARu6sHQbi0grQnlAOGrgl+WxK2/dZg5Ib12ZBqmM8jfL+Gk+I6pX8nZHk9
oiBnAUl+63rtkkGZwGoVkCE+ARM8HoRQ7uDwhACj8YfhMwWzOuRgM1+9JlOeqJ8jdjEa03nmThTp
GHxPio7wbcS9O746aUZY/qAR8IPDdwc+xLsdewqvaAAAAABJRU5ErkJggg==
)
+3
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAWCAYAAAD0OH0aAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACySURBVDhPrVO7EYUgEKQuA8oxv06Ir5CXUggB
pezjHsigHKBvZMbAYff2c2owPQFudwgNxswJ6TY4bPunwkw6WD8bXJF5rvB+hsvEtaURwVMJT37q
8qQQ2WKBR0OIYEuYz0dDiAy7Gp/MVoVsx4OORVpGVNIUgtiR0Iel/K4JZoJiR1obEvp2RMGCFU9J
QWnHE8ygANPZEXDN0qf+ZahbloaebHr5M7V7uAMWzP9f612FL960uYg38Ff7AAAAAElFTkSuQmCC
)
|等于( )
A.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACpSURBVDhPzZI7EoUgDEWzLoosh96dUGchtC7E
gqVcCTyf8nEEKzNjk8nxnmQgdIqIMPTdwb1+3aNvw+vS3mBZgWftIJA4eFaAMEPCEBwQ5y6sgFlS
7zm5umgQBmvsPHwqz8Nx/0N5Gr4qZ9jb31O0/+30abZVKifYe5/mnCEYt+VD9OBKudROBjm9B9fK
zc42Jmp6X7tdpFhucwZk3DtY/63pr5IPsVF4B86Vo9xzwCtAAAAAAElFTkSuQmCC
)
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADPSURBVDhP3ZSxEcMgDEU1FwXj0LMJNYPQMogL
RvlBMsQ+IAk+U/iiOxcW9uNL+kAYBBHh9vMJPMpfydEfg5OHJg2f2hoTvC4z0R51ea4V0ZZh9uBo
CbrslrwG2Sg7z4Hl0wjbKW5zx/s9MFdyKh+5EdwWFn0LLKUPwNyaZ4LxtRXBlImbt4/4OPcxGJ5Y
0Oax1jgNL4QgWacIym27VWbB7JWfdhPlu+oOLMqOi6lYtcicOCAm/8yqx4qvXEGN3TanQMqtB7Mm
Vr1ccS12BfgFqCo/06liGrUAAAAASUVORK5CYII=
)
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADXSURBVDhP3ZS9DcQgDIU9FwXj0LMJNYPQMkgK
RvFh4+T4PSUK1UWKhIz4ePZ7CeDkAQB8/a7As/qTGvwxOHnUoNGnrkeuiyc2Xpv3RhGtmNmDI1rt
sdyV1/mCk30PfB3swCkJtAiNdhe4ngp19XgUK8UCJqWc+91g5ouJWtx9N+MhIBpBzAQMRhw336jk
tsaHXJ/EbTFnCCHwllOAyh28pnk9Byf0epYKVl5UD+D6I6iymvPV/Kwq77CRZvIhUj1XPGniR6kB
H04hKLcfTAJI9XbFZ2c7wB88zU+yh3kDZQAAAABJRU5ErkJggg==
)
D.4
相关试题
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACpSURBVDhPzZI7EoUgDEWzLoosh96dUGchtC7E
gqVcCTyf8nEEKzNjk8nxnmQgdIqIMPTdwb1+3aNvw+vS3mBZgWftIJA4eFaAMEPCEBwQ5y6sgFlS
7zm5umgQBmvsPHwqz8Nx/0N5Gr4qZ9jb31O0/+30abZVKifYe5/mnCEYt+VD9OBKudROBjm9B9fK
zc42Jmp6X7tdpFhucwZk3DtY/63pr5IPsVF4B86Vo9xzwCtAAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADPSURBVDhP3ZSxEcMgDEU1FwXj0LMJNYPQMogL
RvlBMsQ+IAk+U/iiOxcW9uNL+kAYBBHh9vMJPMpfydEfg5OHJg2f2hoTvC4z0R51ea4V0ZZh9uBo
CbrslrwG2Sg7z4Hl0wjbKW5zx/s9MFdyKh+5EdwWFn0LLKUPwNyaZ4LxtRXBlImbt4/4OPcxGJ5Y
0Oax1jgNL4QgWacIym27VWbB7JWfdhPlu+oOLMqOi6lYtcicOCAm/8yqx4qvXEGN3TanQMqtB7Mm
Vr1ccS12BfgFqCo/06liGrUAAAAASUVORK5CYII=
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADXSURBVDhP3ZS9DcQgDIU9FwXj0LMJNYPQMkgK
RvFh4+T4PSUK1UWKhIz4ePZ7CeDkAQB8/a7As/qTGvwxOHnUoNGnrkeuiyc2Xpv3RhGtmNmDI1rt
sdyV1/mCk30PfB3swCkJtAiNdhe4ngp19XgUK8UCJqWc+91g5ouJWtx9N+MhIBpBzAQMRhw336jk
tsaHXJ/EbTFnCCHwllOAyh28pnk9Byf0epYKVl5UD+D6I6iymvPV/Kwq77CRZvIhUj1XPGniR6kB
H04hKLcfTAJI9XbFZ2c7wB88zU+yh3kDZQAAAABJRU5ErkJggg==
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAChSURBVDhPzY+7DcUgDEU9F4XHoc8m1B6ENoOk
YBQ/rhOJT4gCqd6RkBDcgy+kA4hobl35BlzM8Ofyvt3/u+0zchKVHCwkFWaVNCWnHK/IjzGLnb3L
HUlYGWMzi3KpDNbkqjJYkuvKgDR6CxP56+hJbisDijHaJjhSFw7bD+WuMigpa3BOH8l9ZdCkfJYw
/enPPU3qCE7JhW8ywPTPMpiTVX/OlaPcKvfpqwAAAABJRU5ErkJggg==
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADASURBVDhP3ZPBDcMgDEX/XBw8Dnc24cwgXBkk
B0ZxseM0TYNaIlqp6peQsA1P3xaAOwIwv4x1kBRm9c/gmphAnKrFd1VOZHOl1KJVY+AS1osdcAlg
smRNxAhF9+OOuXA4gZ9zezwHlk4e2t/GIqanwNp6Byyj+U3w61FkryDAW/ECWJ9gaJVN+xnknDUV
HdjFRffD4Kb3z02dr65PYHVmn6Atu2sa+CC+FcV13/E1HQhLdAwXPw8WieuvgEXzYOYbqCo/08ut
i+0AAAAASUVORK5CYII=
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADESURBVDhP3ZO7DcQgDEA9FwXj0LMJNYPQMkgK
RvH5l4h8TsoF0tyTkBwDT8YQwAsAYHyYawdPjPLP4pbRg8fc7HtF8tbXWC15V1yjbjyJK0afUVMU
05rVfb9i2XgQt2ZSpcZZ4h4+1c+tEL6LuVJp1WyxYJfobcE8MdGyR7DLBCxBjwFBZ4mn4r7PUEqR
IDlAlxaJn4kbZn/1KqRyrfok7n8CGtsdbe/7kCd2hkCTXDUvGmVnWJJDcGm+mOGqXxEz42LEDzzN
T7KSi5G0AAAAAElFTkSuQmCC
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAALBJREFU
OE/Nk90NhSAMRmEj9mGLDsES7sAAncPEHViitnD9oTZReLpNfJD05Dut6InLqfLe6yP7XWBd3Gkd
P/v+G14XJ3vpnmXlXb1qFyTkxqsKIQBh+QQX4r4biwSA9ew9WakVBAKJHYcv5XGY5z+Uh+G7coNz
/H2CeE5n37BeucI55wql4CikrS3Cup5KudeuBi3dgrXyY+bIiZI+9WNsKZALaQ4WFUmfSj7W/RXe
AUhJkM3kgOb0AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANhJREFU
OE/dlNENwyAMRM1G7JMtGIIl2IEBmAMpO7DE1XZIGxGrTVQ+qvIT4YTH2T7HgRcNyzk3hu7vBTwu
pljhWzGT8CfgVhAooLSxIg0lkPQJFAr219dKUdN20ADXRAj9tlYCKFW9+RpYP61IJ/AYe+2/A0sm
h/TBhZCyiOivwJq6AZbS/CYYb0uRl97x5ekje0CM5qkFE7d1X4fm5Zw1Gj3Bx3WzijnSlivYKx/t
pso31SewKutDwM9u1S7zwoAsfEhUT/9XrNGDfJwPltxE9XTFe29ngB+xhDBGpK/eBwAAAABJRU5E
rkJggg==
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAN9JREFU
OE/dlNERhCAMRENH9EMXFEET9EAB1MGMPdBELoHocYCj3vF1fGGQ57IbVEgDuqGU6kvPnxncD6LM
yo9qU8KfgHNECxZj7hwpdeCcEHw6Fu9ZkXzdOIATehuxfovm9M7Ovgc+NnaKcxZoFZr8KnDrCp/q
sRVnigXMSr/z+AJcliVEK+n+5vHQIBZBwgQMRhI371aZ3jxOfdJuJz5DCKEsOQ2o3Vbm85t3Bc4Y
7awrivKqegC3l6DpVeovOW0Nr2kK/PDY0CKrXv6v2JxG0G49mG1g1csV7wGvAL8AkA46tNbwFYQA
AAAASUVORK5CYII=
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAALBJREFU
OE/Nk90NhSAMRmEj9mGLDsES7sAAncPEHViitnD9oTZReLpNfJD05Dut6InLqfLe6yP7XWBd3Gkd
P/v+G14XJ3vpnmXlXb1qFyTkxqsKIQBh+QQX4r4biwSA9ew9WakVBAKJHYcv5XGY5z+Uh+G7coNz
/H2CeE5n37BeucI55wql4CikrS3Cup5KudeuBi3dgrXyY+bIiZI+9WNsKZALaQ4WFUmfSj7W/RXe
AUhJkM3kgOb0AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANhJREFU
OE/dlNENwyAMRM1G7JMtGIIl2IEBmAMpO7DE1XZIGxGrTVQ+qvIT4YTH2T7HgRcNyzk3hu7vBTwu
pljhWzGT8CfgVhAooLSxIg0lkPQJFAr219dKUdN20ADXRAj9tlYCKFW9+RpYP61IJ/AYe+2/A0sm
h/TBhZCyiOivwJq6AZbS/CYYb0uRl97x5ekje0CM5qkFE7d1X4fm5Zw1Gj3Bx3WzijnSlivYKx/t
pso31SewKutDwM9u1S7zwoAsfEhUT/9XrNGDfJwPltxE9XTFe29ngB+xhDBGpK/eBwAAAABJRU5E
rkJggg==
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAN9JREFU
OE/dlNERhCAMRENH9EMXFEET9EAB1MGMPdBELoHocYCj3vF1fGGQ57IbVEgDuqGU6kvPnxncD6LM
yo9qU8KfgHNECxZj7hwpdeCcEHw6Fu9ZkXzdOIATehuxfovm9M7Ovgc+NnaKcxZoFZr8KnDrCp/q
sRVnigXMSr/z+AJcliVEK+n+5vHQIBZBwgQMRhI371aZ3jxOfdJuJz5DCKEsOQ2o3Vbm85t3Bc4Y
7awrivKqegC3l6DpVeovOW0Nr2kK/PDY0CKrXv6v2JxG0G49mG1g1csV7wGvAL8AkA46tNbwFYQA
AAAASUVORK5CYII=
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAALBJREFU
OE/Nk90NhSAMRmEj9mGLDsES7sAAncPEHViitnD9oTZReLpNfJD05Dut6InLqfLe6yP7XWBd3Gkd
P/v+G14XJ3vpnmXlXb1qFyTkxqsKIQBh+QQX4r4biwSA9ew9WakVBAKJHYcv5XGY5z+Uh+G7coNz
/H2CeE5n37BeucI55wql4CikrS3Cup5KudeuBi3dgrXyY+bIiZI+9WNsKZALaQ4WFUmfSj7W/RXe
AUhJkM3kgOb0AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANhJREFU
OE/dlNENwyAMRM1G7JMtGIIl2IEBmAMpO7DE1XZIGxGrTVQ+qvIT4YTH2T7HgRcNyzk3hu7vBTwu
pljhWzGT8CfgVhAooLSxIg0lkPQJFAr219dKUdN20ADXRAj9tlYCKFW9+RpYP61IJ/AYe+2/A0sm
h/TBhZCyiOivwJq6AZbS/CYYb0uRl97x5ekje0CM5qkFE7d1X4fm5Zw1Gj3Bx3WzijnSlivYKx/t
pso31SewKutDwM9u1S7zwoAsfEhUT/9XrNGDfJwPltxE9XTFe29ngB+xhDBGpK/eBwAAAABJRU5E
rkJggg==
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAN9JREFU
OE/dlNERhCAMRENH9EMXFEET9EAB1MGMPdBELoHocYCj3vF1fGGQ57IbVEgDuqGU6kvPnxncD6LM
yo9qU8KfgHNECxZj7hwpdeCcEHw6Fu9ZkXzdOIATehuxfovm9M7Ovgc+NnaKcxZoFZr8KnDrCp/q
sRVnigXMSr/z+AJcliVEK+n+5vHQIBZBwgQMRhI371aZ3jxOfdJuJz5DCKEsOQ2o3Vbm85t3Bc4Y
7awrivKqegC3l6DpVeovOW0Nr2kK/PDY0CKrXv6v2JxG0G49mG1g1csV7wGvAL8AkA46tNbwFYQA
AAAASUVORK5CYII=
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACpSURBVDhPzZI7EoUgDEWzLoosh96dUGchtC7E
gqVcCTyf8nEEKzNjk8nxnmQgdIqIMPTdwb1+3aNvw+vS3mBZgWftIJA4eFaAMEPCEBwQ5y6sgFlS
7zm5umgQBmvsPHwqz8Nx/0N5Gr4qZ9jb31O0/+30abZVKifYe5/mnCEYt+VD9OBKudROBjm9B9fK
zc42Jmp6X7tdpFhucwZk3DtY/63pr5IPsVF4B86Vo9xzwCtAAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADPSURBVDhP3ZSxEcMgDEU1FwXj0LMJNYPQMogL
RvlBMsQ+IAk+U/iiOxcW9uNL+kAYBBHh9vMJPMpfydEfg5OHJg2f2hoTvC4z0R51ea4V0ZZh9uBo
CbrslrwG2Sg7z4Hl0wjbKW5zx/s9MFdyKh+5EdwWFn0LLKUPwNyaZ4LxtRXBlImbt4/4OPcxGJ5Y
0Oax1jgNL4QgWacIym27VWbB7JWfdhPlu+oOLMqOi6lYtcicOCAm/8yqx4qvXEGN3TanQMqtB7Mm
Vr1ccS12BfgFqCo/06liGrUAAAAASUVORK5CYII=
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADXSURBVDhP3ZS9DcQgDIU9FwXj0LMJNYPQMkgK
RvFh4+T4PSUK1UWKhIz4ePZ7CeDkAQB8/a7As/qTGvwxOHnUoNGnrkeuiyc2Xpv3RhGtmNmDI1rt
sdyV1/mCk30PfB3swCkJtAiNdhe4ngp19XgUK8UCJqWc+91g5ouJWtx9N+MhIBpBzAQMRhw336jk
tsaHXJ/EbTFnCCHwllOAyh28pnk9Byf0epYKVl5UD+D6I6iymvPV/Kwq77CRZvIhUj1XPGniR6kB
H04hKLcfTAJI9XbFZ2c7wB88zU+yh3kDZQAAAABJRU5ErkJggg==
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAALBJREFU
OE/Nk90NhSAMRmEj9mGLDsES7sAAncPEHViitnD9oTZReLpNfJD05Dut6InLqfLe6yP7XWBd3Gkd
P/v+G14XJ3vpnmXlXb1qFyTkxqsKIQBh+QQX4r4biwSA9ew9WakVBAKJHYcv5XGY5z+Uh+G7coNz
/H2CeE5n37BeucI55wql4CikrS3Cup5KudeuBi3dgrXyY+bIiZI+9WNsKZALaQ4WFUmfSj7W/RXe
AUhJkM3kgOb0AAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAANhJREFU
OE/dlNENwyAMRM1G7JMtGIIl2IEBmAMpO7DE1XZIGxGrTVQ+qvIT4YTH2T7HgRcNyzk3hu7vBTwu
pljhWzGT8CfgVhAooLSxIg0lkPQJFAr219dKUdN20ADXRAj9tlYCKFW9+RpYP61IJ/AYe+2/A0sm
h/TBhZCyiOivwJq6AZbS/CYYb0uRl97x5ekje0CM5qkFE7d1X4fm5Zw1Gj3Bx3WzijnSlivYKx/t
pso31SewKutDwM9u1S7zwoAsfEhUT/9XrNGDfJwPltxE9XTFe29ngB+xhDBGpK/eBwAAAABJRU5E
rkJggg==
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAN9JREFU
OE/dlNERhCAMRENH9EMXFEET9EAB1MGMPdBELoHocYCj3vF1fGGQ57IbVEgDuqGU6kvPnxncD6LM
yo9qU8KfgHNECxZj7hwpdeCcEHw6Fu9ZkXzdOIATehuxfovm9M7Ovgc+NnaKcxZoFZr8KnDrCp/q
sRVnigXMSr/z+AJcliVEK+n+5vHQIBZBwgQMRhI371aZ3jxOfdJuJz5DCKEsOQ2o3Vbm85t3Bc4Y
7awrivKqegC3l6DpVeovOW0Nr2kK/PDY0CKrXv6v2JxG0G49mG1g1csV7wGvAL8AkA46tNbwFYQA
AAAASUVORK5CYII=
)
D.4
-
已知向量
、
均为单位向量,若它们的夹角120°,则|
+3
|等于( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAChSURBVDhPzY+7DcUgDEU9F4XHoc8m1B6ENoOk
YBQ/rhOJT4gCqd6RkBDcgy+kA4hobl35BlzM8Ofyvt3/u+0zchKVHCwkFWaVNCWnHK/IjzGLnb3L
HUlYGWMzi3KpDNbkqjJYkuvKgDR6CxP56+hJbisDijHaJjhSFw7bD+WuMigpa3BOH8l9ZdCkfJYw
/enPPU3qCE7JhW8ywPTPMpiTVX/OlaPcKvfpqwAAAABJRU5ErkJggg==
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADASURBVDhP3ZPBDcMgDEX/XBw8Dnc24cwgXBkk
B0ZxseM0TYNaIlqp6peQsA1P3xaAOwIwv4x1kBRm9c/gmphAnKrFd1VOZHOl1KJVY+AS1osdcAlg
smRNxAhF9+OOuXA4gZ9zezwHlk4e2t/GIqanwNp6Byyj+U3w61FkryDAW/ECWJ9gaJVN+xnknDUV
HdjFRffD4Kb3z02dr65PYHVmn6Atu2sa+CC+FcV13/E1HQhLdAwXPw8WieuvgEXzYOYbqCo/08ut
i+0AAAAASUVORK5CYII=
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADESURBVDhP3ZO7DcQgDEA9FwXj0LMJNYPQMkgK
RvH5l4h8TsoF0tyTkBwDT8YQwAsAYHyYawdPjPLP4pbRg8fc7HtF8tbXWC15V1yjbjyJK0afUVMU
05rVfb9i2XgQt2ZSpcZZ4h4+1c+tEL6LuVJp1WyxYJfobcE8MdGyR7DLBCxBjwFBZ4mn4r7PUEqR
IDlAlxaJn4kbZn/1KqRyrfok7n8CGtsdbe/7kCd2hkCTXDUvGmVnWJJDcGm+mOGqXxEz42LEDzzN
T7KSi5G0AAAAAElFTkSuQmCC
)
D.4
-
已知
,
是两夹角为120°的单位向量,
=3
+2
,则|
|等于( )
A.4
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKpJREFU
OE/tlNsNgCAMRWEj9mELh2AJdmAA5yBxB5aotPjEkkBSf4xNSLSNx8stRUMOVYXWuk6NvyO4jkzh
0kM5lvARcJphUhPMiXGEqfVZET02OC8G3Kj1gUlkBN9SzNR+8NHZF60Iduu4Pf/GTt5g80IIBHRG
gXELPfOTNwg+ZJLyovoBpgHAc1yWj5chadRuHtv8EaoWvysWZ0AZJw/GDaJqccW7cxLgFZyTQqkh
vNxZAAAAAElFTkSuQmCC
)
C.3
D.
-
已知
,
是两夹角为120°的单位向量,
=3
+2
,则|
|等于( )
A.4
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKpJREFU
OE/tlNsNgCAMRWEj9mELh2AJdmAA5yBxB5aotPjEkkBSf4xNSLSNx8stRUMOVYXWuk6NvyO4jkzh
0kM5lvARcJphUhPMiXGEqfVZET02OC8G3Kj1gUlkBN9SzNR+8NHZF60Iduu4Pf/GTt5g80IIBHRG
gXELPfOTNwg+ZJLyovoBpgHAc1yWj5chadRuHtv8EaoWvysWZ0AZJw/GDaJqccW7cxLgFZyTQqkh
vNxZAAAAAElFTkSuQmCC
)
C.3
D.