1 . 如图,在四面体OABC中,点M、N分别为线段OA、BC的中点,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee477d164d38ff067fc4ce342cf6d380.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9dda0dd9f20ab49de6bd5cf6297f9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee477d164d38ff067fc4ce342cf6d380.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/0a5d5602-92e2-4197-87da-9077138aa106.png?resizew=135)
您最近一年使用:0次
解题方法
2 . 如图,在平行六面体
中,
,
.设
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/58b29fe2-0ba5-4e11-afb4-f5e5b6e62003.png?resizew=158)
(1)用基底
表示向量
,
,
;
(2)证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046ea5ec8bb0f777482b086d181e2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ecd2fb9d59e0d9a46ea3062f566ff40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e984585ddf28c039219afcebf229de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5ad65006ab94c402084227f4675b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/58b29fe2-0ba5-4e11-afb4-f5e5b6e62003.png?resizew=158)
(1)用基底
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21775d2a1d85b5be06c17f6eeddfd9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bdd77c24f415d52848ff40bc8574b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333a232d5882b2f03f9e02846c442a95.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d1f6daed7a89d2c7aee5dd8f2d1ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd148d264bc9043396f777523e907aa.png)
您最近一年使用:0次
3 . 如图,在空间直角坐标系
中,正方体
的棱长为1,且
于点E,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a20b689283cc8b311eddae4c8c4242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77bb3ceea90414c8561c000e724f2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398c5d7b6ff455e94a78034670a3eeca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/fe8be1e3-2774-4a29-807f-bb610ae8e4d9.png?resizew=145)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 空间四边形OABC中,
,点
在OA上,
,点
为BC的中点,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/1ecdd91f-6277-47bf-b3fd-c07bfac61021.png?resizew=142)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352afb2166bc2d282d55bd7bba4388e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a6df89d21d97de4928ee94b2c6af33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8926ddd0b69d714c7310cc5bf23d199d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/1ecdd91f-6277-47bf-b3fd-c07bfac61021.png?resizew=142)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
5 . 如图,在四面体
中,
,
,
,点M、 N分别在线段
、
上,且
,
,则
等于( )
![](https://img.xkw.com/dksih/QBM/2024/1/31/3422845647241216/3433855973654528/STEM/3342a6ecdbb843b286e0fd52fd346169.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14390e9b6b44472bdc7a131133ab39b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd14dfc0024459f9d8e594c95c5106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07dcf0b16163e0e0e0c0f248466ee7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed047057b4761eb26c763f563e39667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db954ae54ae36c4de591ba32c2408002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a014dff8997c661055229de29c61cfc.png)
![](https://img.xkw.com/dksih/QBM/2024/1/31/3422845647241216/3433855973654528/STEM/3342a6ecdbb843b286e0fd52fd346169.png?resizew=141)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
6 . 在三棱锥
中,
为
的中点,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/1e99e52d-3af5-4dcd-a98d-0481254bc045.png?resizew=155)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d859221abb763742e332779e9eab59.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/1e99e52d-3af5-4dcd-a98d-0481254bc045.png?resizew=155)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2024-02-12更新
|
228次组卷
|
5卷引用:陕西省西安市莲湖区2023-2024学年高二上学期期末质量监测数学试题
名校
7 . 如图,空间四边形
中,
,点
在
上,且
,点
为
中点,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/12/dbc95f97-2ec0-4bfa-96db-660a6b40621f.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc5343d0ed7b449971c7ba787a621fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe72d1b634f1e89d8699e605e7d46af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8926ddd0b69d714c7310cc5bf23d199d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/12/dbc95f97-2ec0-4bfa-96db-660a6b40621f.png?resizew=150)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2024-02-12更新
|
154次组卷
|
4卷引用:陕西省渭南市澄城县2023-2024学年高二上学期期末文化课检测数学试题
名校
解题方法
8 . 如图,在正方体 ,
,
是正方形
内部(含边界)的一个动点,则( )
A.存在唯一点![]() ![]() |
B.当点![]() ![]() ![]() ![]() |
C.直线![]() ![]() ![]() |
D.当![]() ![]() |
您最近一年使用:0次
2024-02-05更新
|
213次组卷
|
2卷引用:陕西省西安铁一中学2023-2024学年高二上学期期末考试数学试题
9 . 关于空间向量,以下说法正确的是( )
A.若非零向量![]() ![]() ![]() ![]() ![]() ![]() |
B.若对空间中任意一点O,有![]() |
C.若空间向量![]() ![]() ![]() ![]() ![]() |
D.已知直线l的方向向量为![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2024-02-04更新
|
254次组卷
|
2卷引用:陕西省西安市莲湖区2023-2024学年高二上学期期末质量监测数学试题
10 . 已知空间向量
.
(1)若
,求实数
与
的值;
(2)若
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7cbd199230f153bfe138edd14735684.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe3159fede573644c8cf10c763fd82e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0404f82aa062c72a4f6fcbfe9f4db167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cba22ec376fbe8aa2f079a1c6daa790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cfe95f520c7b454ceabb2ae9af0a87.png)
您最近一年使用:0次