在菱形
中,
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f7af3d474e4aac4e11ba50ad66e727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5c71f30cf7da921fb7c196a52f758d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/748976b9d6406bf5f2598845ec69c2de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb03e43b9e389c547b972757d21477.png)
A.1 | B.![]() | C.2 | D.![]() |
更新时间:2023-10-26 10:26:18
|
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单选题
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解题方法
【推荐1】如图,在四边形ABCD中,
,E为边BC的中点,若
则λ+μ=( )
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513473855873024/2514165559705600/STEM/57dc7282-e874-446e-a507-0048c33dd782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776a60c8de7e8bb51d466275bb9b63c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa65926df14b5046968c1a860421b39.png)
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513473855873024/2514165559705600/STEM/57dc7282-e874-446e-a507-0048c33dd782.png)
A.![]() | B.1 | C.![]() | D.![]() |
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【推荐2】如图,△ABC中,设
,D为BC中点,又
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/eff4a1cb-137f-4633-be95-3bfcfe533c6f.png?resizew=208)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11390e82b789880ac4243d1b62196cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e28a42f6d431be3660146e09ac57684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ead0d95d94c4650f8030f18e5d58b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/eff4a1cb-137f-4633-be95-3bfcfe533c6f.png?resizew=208)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐3】在边长为2的等边三角形ABC中,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c290cdc4cf3d6b82581e68ecaf5c7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43abdfba44c0d7f10357f47f02506772.png)
A.![]() | B.2 | C.![]() | D.4 |
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【推荐2】设向量
的夹角的余弦值为
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb371bd7728c6d6a16533a93924ad998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7676b087de046cd86bcefbeba258ad57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8b0314e4127341a8a78a2b9121c10d.png)
A.15 | B.11 | C.12 | D.9 |
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