1 . 如图,在直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572559566585856/1572559572484096/STEM/c1598c1916cc46e293f829ea35779147.png)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df209c58c4cc146ef62100e6d3b068d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e199a5d02bfb5b869221e61d31969bea.png)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572559566585856/1572559572484096/STEM/c1598c1916cc46e293f829ea35779147.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3da59ed9a8bc1877e5c7d00560fb703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a486d75becfb835e4f6ef6b40333968.png)
您最近一年使用:0次
2 . 如图所示,
的二面角的棱上有两点
,直线
分别在这个二面角的两个半平面内,且都垂直于
,已知
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f89c26d6931a53ad520b023a83423f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1d39d013611e0a09e3b307e447f4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572558427725824/1572558433542144/STEM/dfd4be2cc5b9416f9f54a9635c351473.png)
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3 . 如图,在直三棱柱
中,
,
,且
是
中点.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572558230298624/1572558236524544/STEM/826d4324e1ff4e65ad1e556f4e7d2807.png)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4482938199ddfa1129dc9c9975c3d35.png)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572558230298624/1572558236524544/STEM/34b840f4cb0240b98c4e0bbd76b222a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572558230298624/1572558236524544/STEM/826d4324e1ff4e65ad1e556f4e7d2807.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f5e9b7e51ad1cfce7edd61997dc1a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
您最近一年使用:0次
2016-12-04更新
|
746次组卷
|
2卷引用:2015-2016学年内蒙古赤峰市宁城县高一上学期期末考试数学试卷
4 . 如图,四棱锥
中,底面
是边长为
的菱形,
.
面
,且
.
在棱
上,且
,
在棱
上.
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/13ad527fdd2e44f4b11105663079df1e.png)
(Ⅰ)若
面
,求
的值;
(Ⅱ)求二面角
的大小.
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/805bf7be97b54d2fa42c86bb17db7751.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/eb640dfd0f61446b9c2a61f53170c20e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/afe5579469d14024a4411d117a5b2831.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/ea436f0d8c37459f9fea24b313505785.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/02708ebe62754d3a844f0394c99fb5f1.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/eb640dfd0f61446b9c2a61f53170c20e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/707b004c6e1346b2a1e5bd3d69e63e8b.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/58fa7c8bde684bcda1fa3a744e66f657.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/49961c2823dd46e9a95d1b2a0a954229.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/03f624f9c76441c7b7fb02cd706b9d81.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/64a92ef7b11f4c8eb2f55288f9cd613b.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/fa7c67f71f904cbab53a1541a240922c.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/13ad527fdd2e44f4b11105663079df1e.png)
(Ⅰ)若
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/714e62b620c1417490dd2ffc949bc483.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/d89535e14d534d2a9dc688e8b38ae51b.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/3c97fab822e8485dac628b14832b839e.png)
(Ⅱ)求二面角
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572555126374400/1572555132346368/STEM/6aaec0b81c114177b3d44bf78013fc2d.png)
您最近一年使用:0次
5 . 如图,在正方体
中
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/5f0cf996-d3b3-4486-a73e-b0fb4de4f2ce.png?resizew=218)
(1)求证:AD1⊥平面CDA1B1;
(2)求直线AD1与直线BD所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/5f0cf996-d3b3-4486-a73e-b0fb4de4f2ce.png?resizew=218)
(1)求证:AD1⊥平面CDA1B1;
(2)求直线AD1与直线BD所成的角.
您最近一年使用:0次
解题方法
6 . 如图,在正方体
中,
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549923749888/1572549930000384/STEM/4770d6671b304f7ea795af8fbeb9ec49.png?resizew=185)
(1)求证:
//平面
;
(2)求异面直线
与
所成角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea77ba313fcc751481ac1ca214df3fc.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549923749888/1572549930000384/STEM/4770d6671b304f7ea795af8fbeb9ec49.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86eec8526479272d15bb3b171a46de0.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
您最近一年使用:0次
7 . 在正方体
中,
、
、
分别是
和
的中点,
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/d24cd3aca063494082a235f8a0ba0e08.png)
求证:(1)![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/cda69173e09b4a2c82583b976efa74da.png)
(2)平面
//平面
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/610fe39bb38248549b22664e4ef5c06b.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/d6cd375135044b70b0872df51fb0646e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/e069bfa72544472989425f360b3ab764.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/71114640f86a4cf69002716469c668e7.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/91646bf59b764104ba684b60b1be4b1f.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/949a3f3bd26444a681ab184ad843951a.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/d24cd3aca063494082a235f8a0ba0e08.png)
求证:(1)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/cda69173e09b4a2c82583b976efa74da.png)
(2)平面
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/98fc736f0d7548d5997ef7de68d2a5bd.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572549119139840/1572549125324800/STEM/d7c71dcf97004d1db16792f38f798fa9.png)
您最近一年使用:0次
解题方法
8 . 如图1,在直角梯形ADCE中,AD//EC,EC=2BC,∠ADC=90°,AB⊥EC,点F为线段BC上的一点.将△ABE沿AB折到△ABE1的位置,使E1F⊥BC,如图2.
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572546264317952/1572546270298112/STEM/5236eb81-1cb6-4671-8b96-780af043528e.png?resizew=437)
(Ⅰ)求证:AB//平面CDE1;
(Ⅱ)求证:E1F⊥AC;
(Ⅲ)在E1D上是否存在一点M,使E1C⊥平面ABM.说明理由.
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572546264317952/1572546270298112/STEM/5236eb81-1cb6-4671-8b96-780af043528e.png?resizew=437)
(Ⅰ)求证:AB//平面CDE1;
(Ⅱ)求证:E1F⊥AC;
(Ⅲ)在E1D上是否存在一点M,使E1C⊥平面ABM.说明理由.
您最近一年使用:0次
9 . 如图,多面体
中,四边形
是边长为2的正方形,四边形
为等腰梯形,
,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/f77ae9db046f4983b53357362746ed76.png)
(Ⅰ)证明:![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/a972730275364bee8635ee974e1b8949.png)
平面
;
(Ⅱ)若梯形
的面积为
,求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/8bff475283c84280a678fc99683c57cd.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/4c14e128142b420595424344c12f2ded.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/5b9a7ffaa39847ce86e39bb63ae5ad67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22f3143a34f1f78bc5ef35c24d4beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae67dd40ed87b290fb81fb9745c6fc9.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/36415b5f33b04478b1b897527804c88e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/4c14e128142b420595424344c12f2ded.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/f77ae9db046f4983b53357362746ed76.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/a972730275364bee8635ee974e1b8949.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/e3d43e7ea80141feb81f0277dc883de5.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/0a76006cdcc14552b24ea83fdbed57b5.png)
(Ⅱ)若梯形
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/5b9a7ffaa39847ce86e39bb63ae5ad67.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572543562514432/1572543568789504/STEM/c187a29af3ef4318a9d12532e31fceab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ebb52abd71cd7682f7f5326b03bc37.png)
您最近一年使用:0次
10 . 如图,在三棱柱ABC﹣A1B1C1中,侧棱AA1⊥底面ABC,AC=3,BC=4,AB=5,AA1=4,点D是AB的中点.
![](https://img.xkw.com/dksih/QBM/2016/3/16/1572540793143296/1572540799270912/STEM/cd26067818864de9b41a41196042834c.png)
(Ⅰ)求证:AC1∥平面CDB1
(Ⅱ)求证:AC⊥BC1
(Ⅲ)求直线AB1与平面BB1C1C所成的角的正切值.
![](https://img.xkw.com/dksih/QBM/2016/3/16/1572540793143296/1572540799270912/STEM/cd26067818864de9b41a41196042834c.png)
(Ⅰ)求证:AC1∥平面CDB1
(Ⅱ)求证:AC⊥BC1
(Ⅲ)求直线AB1与平面BB1C1C所成的角的正切值.
您最近一年使用:0次