1 . 如图,四边形ABCD与BDEF均为菱形,且
,平面
平面BDEF,AC与BD交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/62c56c30-1143-4ea3-bde6-39d97a268ef8.png?resizew=158)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
平面FBC;
(2)求平面AFC与平面BFC夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd3ed8807db1250667c70433e1b6f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/62c56c30-1143-4ea3-bde6-39d97a268ef8.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求平面AFC与平面BFC夹角的余弦值.
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名校
解题方法
2 . 如图所示,几何体
中,
是正三角形,
,
均与面
垂直,且
,点
、
分别在棱
、
上,满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/4aff93f7-04da-42a1-91d5-133bd6c8e11a.png?resizew=169)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1d97b95bccd80f06c3af864897da9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a798ddf34f0fed7cb1616228cc88936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65734b86acbb1df7057b72cbf6dcb4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/4aff93f7-04da-42a1-91d5-133bd6c8e11a.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9c68879985182b4de065c552cb8e31.png)
您最近一年使用:0次
2021-07-15更新
|
390次组卷
|
2卷引用:安徽省滁州市定远县育才学校2021-2022学年高三下学期期中考试数学(文)试题
3 . 如图,在四棱锥
中,
为等边三角形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/dbfe6b5a-5e74-4710-9906-ed01f8c35cf8.png?resizew=218)
(Ⅰ)若点
为
的中点,求证:
平面
;
(Ⅱ)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397bf976a5d6ea47153fb564cc8ea190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822728cf620309a9d0d1bf661e964b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37d3fb7407af74cbd242f606eadd710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aaaa7abe827f3de2be324647ca92bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d918ea86001c635eeede8d3fcc3a31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/dbfe6b5a-5e74-4710-9906-ed01f8c35cf8.png?resizew=218)
(Ⅰ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5258a6f9c63914b9e2ec95b6d39313b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3520ee9cc97a075e889e1625dba1157c.png)
(Ⅱ)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
您最近一年使用:0次
2019-02-01更新
|
873次组卷
|
2卷引用:安徽省合肥市2019届高三一模数学(文)试题
解题方法
4 . 如图,在边长为2的正方体
中,点
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/9afd5e22-14e3-4ee5-a5c3-15ba35ff7f59.png?resizew=180)
(1)证明:
平面
;
(2)若
为侧面
内一点,且
平面
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/9afd5e22-14e3-4ee5-a5c3-15ba35ff7f59.png?resizew=180)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808709d61dda984c341792168f67104f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f33fa5152ba27f7b8a28890cefca219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7f5d3a32de5e2f05c86d2e9cd94f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
您最近一年使用:0次
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5 . 如图,多面体ABCDEF中,DE⊥平面ABCD,底面ABCD是菱形,AB=2,∠BAD=60°,四边形BDEF是正方形.
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712830689280/2857331093274624/STEM/7aa19aee-ce29-46f3-b057-822b4ac118c0.png?resizew=258)
(1)求证;CF∥平面AED;
(2)求直线AF与平面ECF所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712830689280/2857331093274624/STEM/7aa19aee-ce29-46f3-b057-822b4ac118c0.png?resizew=258)
(1)求证;CF∥平面AED;
(2)求直线AF与平面ECF所成角的正弦值.
您最近一年使用:0次
2021-11-23更新
|
314次组卷
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4卷引用:安徽省宿州市砀山中学2021-2022学年高二上学期第一次质量检测数学试题
解题方法
6 . 如图,在棱长为a的正方体中,点M为A1B上任意一点,求证:DM∥平面CB1D1.
![](https://img.xkw.com/dksih/QBM/2020/10/10/2568104637374464/2569571144040448/STEM/c71c8b489c324a5687dbe4ee3b3213b7.png?resizew=183)
您最近一年使用:0次
2020-10-12更新
|
402次组卷
|
3卷引用:安徽省蚌埠市田家炳中学2020-2021学年高二上学期10月月考数学(文)试题
名校
解题方法
7 . 如图,在多面体
中,四边形
是正方形,
是正三角形,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573025185284096/1573025191321600/STEM/fff0b3427c6940a0b2ac776e11d9dc4f.png)
(1)求证:
平面
;
(2)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a91478bb050c5f65793155c29ec27de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2f042901f9931fcc9b418752261d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2a2acf383667b8ff3575fdeccc8e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7579755d7d17bd72d97b03df323aefa4.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573025185284096/1573025191321600/STEM/fff0b3427c6940a0b2ac776e11d9dc4f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c920d02068d0e63ffdab70786c526d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93daae6ec80968c0630e229c1fa1b84.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
您最近一年使用:0次
2016-12-04更新
|
1381次组卷
|
4卷引用:安徽省合肥市第八中学2020-2021学年高二上学期第一次段考理科数学试题
名校
解题方法
8 . (如图1)在直角梯形
中,
,
,
,
,
,点
在
上,且
.将
沿
折起,使得平面
平面
(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/967965e2-1efd-40e4-b065-0bd7bc1a29d2.png?resizew=364)
(1)求证:
;
(2)在线段
上是否存在点
,使得
平面
?若存在,求
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/967965e2-1efd-40e4-b065-0bd7bc1a29d2.png?resizew=364)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93651f094df56f6b87fbd1d12c7a3d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e49382868c1bbbc8ccfc1fddf981fd.png)
您最近一年使用:0次
名校
9 . 如图,在菱形
中,
,平面
平面
是线段
的中点,
.
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447897895649280/2448171207032832/STEM/c2f7d1afd8c84714ba3c52f8ac110fce.png?resizew=174)
(1)证明:
平面
.
(2)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbef63825ad9230972f4bb31a549c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c1acdd27cebb11e0266464b03b3afb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2293bdd1209e807b3392e4b6e9faa8a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc356feeed0c605c2ddf28d3940bcdc.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447897895649280/2448171207032832/STEM/c2f7d1afd8c84714ba3c52f8ac110fce.png?resizew=174)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0457394ce4f2dc8d940c565c94dcf557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
您最近一年使用:0次
2020-04-24更新
|
283次组卷
|
2卷引用:安徽省淮北市第一中学2019-2020学年高三下学期第五次考试数学(理)试题
10 . 如图,
是圆柱的母线,边长为4的正
是该圆柱的下底面的内接三角形,
,
,
分别为
,
,
的中点,
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/6f4f1c5f-a4f5-41c5-9d90-4de27f5f50ad.png?resizew=159)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602ee324ca5bc3cf9ef251a061b431ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/6f4f1c5f-a4f5-41c5-9d90-4de27f5f50ad.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b859ca54ab085edf70c1179a7d103a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
2021-08-13更新
|
155次组卷
|
2卷引用:安徽省六安市舒城中学、安庆市太湖中学2020-2021学年高二下学期期中联考理科数学试题