已知斜三棱柱
的所有棱长都相等,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/0c63a9ad-7a4e-4d85-8464-2ce593d2855d.png?resizew=197)
(1)求证:
;
(2)直线
与直线
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab1e0cf85e1d72b5a950bd07dc1e3d5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/0c63a9ad-7a4e-4d85-8464-2ce593d2855d.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8bf13a983d4f4d790dc489e7154f9d.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc6e94d7b0ad5b787681b709f1e9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780901c1977b08c38c6ca1e36fe667c2.png)
更新时间:2019-04-10 10:58:27
|
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解答题-问答题
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适中
(0.64)
【推荐1】如图,在三棱锥S -ABC中,△ABC是边长为2的正三角形,平面SAC⊥平面ABC,SA=SC=
,M为AB的中点.
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601060786176/1572601066807296/STEM/20c3226f2018438f934a7fb2e5744795.png)
(I) 证明:AC⊥SB;
(II)求点B到平面SCM的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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(I) 证明:AC⊥SB;
(II)求点B到平面SCM的距离.
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适中
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解题方法
【推荐2】如图,在正方体
中,
分别是中点.
(Ⅰ)求证:
;
(Ⅱ)求证:
平面
;
(III)棱
上是否存在点 P 使
,若存在,确定点 P 位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa3c61d6c19e187b4b824b6f5610cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
(III)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77f3121872c87191b347ffc035aa6b8d.png)
![](https://img.xkw.com/dksih/QBM/2012/1/26/1570696604385280/1570696609726464/STEM/3c35488aae9f4f01b0551c61efa0a152.png?resizew=255)
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名校
解题方法
【推荐1】如图,已知四棱锥
的底面是正方形,
底面
,
是侧棱
的中点.
(1)证明
平面
.
(2)求异面直线
与
所成的角;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950c252a8e6fcbf0ee41954034807ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/f66b33f8-86fe-41f1-8f93-2aa9d8ac10a1.png?resizew=193)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图,已知正方体
的棱长为
,
,
分别是棱
与
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/6bf26bea-f630-4c1b-81c0-3b23e1bd9643.png?resizew=173)
(1)求以
,
,
,
为顶点的四面体的体积;
(2)求异面直线
和
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/6bf26bea-f630-4c1b-81c0-3b23e1bd9643.png?resizew=173)
(1)求以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c798204bbe306b3efd5bc9eae594c171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e935bb9d7b7115429edbd1e7469af65.png)
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名校
【推荐1】如图:在多面体
中,底面
是正方形,
,
.
底面
.
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955971818848256/2957847891927040/STEM/f60b5ebc-3684-4952-8186-faf1f99908ce.png?resizew=180)
(1)证明:
平面
.
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d4ea87a0837c4eee99c8b5ba6ec977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56dd125a93bf6d5567753b059eec6a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955971818848256/2957847891927040/STEM/f60b5ebc-3684-4952-8186-faf1f99908ce.png?resizew=180)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3c0430146b7b8d40ebb721a4d0de19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,正方体
中,
分别是
与
的中点.
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447896578228224/2447946936016896/STEM/2f64b18ee7144773bd4106f531b05031.png?resizew=175)
(1)求证:
平面
.
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525235119b7977ffae46707a313bba20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447896578228224/2447946936016896/STEM/2f64b18ee7144773bd4106f531b05031.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0b72906641ed13716cfbce50923282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ecddac920c36d7b70cd9737707852f.png)
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(0.65)
【推荐3】如图,在三棱锥
中,
,
,
、
分别是线段
、
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/458aaa4f-8293-45a8-91f2-d7dbb64c51f4.png?resizew=175)
(1)证明:直线
平面
;
(2)若二面角
的大小为
,求直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5326159a6399c85b323e12469433396c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0e01be509f88f309145009287664da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5f6a5ef7adde151236e78ec5d8c00d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e30f954b6c7cb2f353505b44cf300fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839710017c26592a5c0d36db80de10a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/458aaa4f-8293-45a8-91f2-d7dbb64c51f4.png?resizew=175)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/717755df2adbebf93dc4ea88ed9fa7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d3f5f4c4419913c1232b7aae03ade.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3b24dda15facdc18a70fa72dd69bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3f6406a480e548d8f14cc984f12ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
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