已知空间三点
,
,
.
(1)求
的面积;
(2)若向量
,且
,求向量
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8077ed88333e0a9f03ab92a91ba6c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e896660e590869e0d260b5485b5310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ca740eb364a3fe8792de2870b645e6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20921cd7767bb17abf19085e8013e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187109b9bc51f86bc6cfc165b8dc0853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed9c2e9fabbfc63733bae8fa079d00.png)
更新时间:2021-12-10 09:42:54
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】在
中,角
的对边分别为
.
(1)求证:
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7edc6443a6506bc5b0b4bf645d3eaf.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24f6ca7d38acff960c84209fe25512e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73f0d1883515710066c33d230ed4cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
【推荐2】从①
;②
;③
,
,且
,这三个条件中选择一个,补充在下面试题的横线上,并完成试题解答.
设
的内角
所对的边分别为
.已知
的面积为
,且__________.
(1)求
;
(2)若
,求
的最小值,并判断此时
的形状.
注:若选择多个条件分别解答,则按第一个条件计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21440b7af86688c3bc9e3f09b9a2f4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59c34c7422e88bc801cfabbf04369c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6911ee81584d4ce998d737570e7489b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57156fa6eeed6a216dcf1d9ed1f002b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a53cdfd02f840f55c72dbb4d0607c1.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0965e1e82358070ca8cac70626a56af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
注:若选择多个条件分别解答,则按第一个条件计分.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在棱长为2的正方体
中,点E,F分别是BC,
的中点,点G在AB上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/b1943d52-b0bb-46bf-a711-c85a9f0f47db.png?resizew=166)
(1)已知上底面
内一点H满足
,求
的长.
(2)棱
上是否存在一点K,使得GK,EF共面?若存在,求
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c106f6383c69ecf5c7634b29996cfa7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/b1943d52-b0bb-46bf-a711-c85a9f0f47db.png?resizew=166)
(1)已知上底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29dd8914518df1e2c2899f7fbb00336d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8a295e9474afc5e3628832bd3724f1.png)
(2)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dbc6873d8755da83f17db19bf0bc32e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,已知正方体ABCD-A′B′C′D′,E,F分别为AA′和CC′的中点.求证:BF∥ED′.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/c96123a0-672c-42af-b830-5c02b2ff7003.png?resizew=165)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】1.如图,
是四面体
的棱
的中点,点
在线段
上,点
在线段
上,且
,
,
,
,
,求
;
(2)试用向量
,
,
表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ac9904467780bca2f8d563d1ac7f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878f5ef5bb7983a6556aba8cc516588d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/201821f8a7c51749e6ac9cca471336d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c53d934a0cd9512e6df17c8f311c3ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5966404b0d23ee38ca70b25e3ee83bc2.png)
(2)试用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知正四面体
的棱长为1,
,
,
,
分别是棱
,
,
,
的中点,设
,
,
,用向量法解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/ab76de20-360c-4afa-b773-5c49b0ac44e3.png?resizew=192)
(1)求
;
(2)求直线
与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae92f0c583cc9daf980a8621ad96aef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f111250ea56c59b179cfc7b5db12cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/ab76de20-360c-4afa-b773-5c49b0ac44e3.png?resizew=192)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dcd475268fa6be81d13ba7dcd4abfc7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】在平行四边形ABCD中,AD=4,CD=3,∠D=60°,PA⊥平面ABCD,PA=6,求PC的长.
您最近一年使用:0次