如图,在四棱锥
中,四边形
是直角梯形,
,
,
为等边三角形.
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731336569552896/2782487578140672/STEM/7f6aefc1e15a450faef0444c0f45cec6.png?resizew=210)
(1)证明:平面
平面
;
(2)若
的面积为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b566b814612351e083f5c8b218319dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e32e6fa4030411db9bc4626b8c695f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731336569552896/2782487578140672/STEM/7f6aefc1e15a450faef0444c0f45cec6.png?resizew=210)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
更新时间:2021-08-09 15:28:22
|
相似题推荐
解答题-问答题
|
适中
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名校
解题方法
【推荐1】如图,在五面体
中,侧面
是正方形,
是等腰直角三角形,点
是正方形
对角线的交点,
且
.
![](https://img.xkw.com/dksih/QBM/2020/3/24/2426234686218240/2426648933654528/STEM/24db67bc2e02417c9ebb2b602728c7e9.png?resizew=100)
(1)证明:
平面
.
(2)若侧面
与底面
垂直,求五面体
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2024dab99114901f0082156e2e301e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6020b78ff385667b30088ecadeadd3.png)
![](https://img.xkw.com/dksih/QBM/2020/3/24/2426234686218240/2426648933654528/STEM/24db67bc2e02417c9ebb2b602728c7e9.png?resizew=100)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a78b6fb582468bdd5c3afa5461aefce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)若侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
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解答题-作图题
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解题方法
【推荐2】如图,在棱长为
的正方体
中,
,
分别是
,
的中点,过
,
,
三点的平面与正方体的下底面
相交于直线
.
(1)画出直线
的位置,保留作图痕迹,不需要说明理由;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/959553f7-f390-4d52-bde9-78f0b031321e.png?resizew=160)
(1)画出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49fa04431a92d131d7b0b903139bd867.png)
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解答题-问答题
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【推荐1】如图,PA
平面ABCD,四边形ABCD为矩形,PA=AB=
,AD=1,点F是PB的中点,点E在边BC上移动.
![](https://img.xkw.com/dksih/QBM/2020/9/2/2540999836794880/2543541635342336/STEM/db524290-0122-4220-a0cc-10a7c1dc46d2.png)
(1)当点E为BC的中点时,证明EF//平面PAC;
(2)证明:无论点E在边BC的何处,都有PE
AF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2020/9/2/2540999836794880/2543541635342336/STEM/db524290-0122-4220-a0cc-10a7c1dc46d2.png)
(1)当点E为BC的中点时,证明EF//平面PAC;
(2)证明:无论点E在边BC的何处,都有PE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
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【推荐2】如图,在四棱锥
中,平面
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/f6a9e8ed-d303-4ab1-985c-0d892f27c925.png?resizew=219)
(1)证明:
平面
;
(2)线段
上是否存在一点
,使得
与平面
所成角的正弦值为
?若存在,请求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e45b6f8cf0260912f587c04f9f2442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0335b703becb783ea1902d628dbacafc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01510a5e33071204860456f2f3dfcc1d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/f6a9e8ed-d303-4ab1-985c-0d892f27c925.png?resizew=219)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4510d0a6828f0555004a9356043c0312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1612a0a4df3353fba4da6678c6a0cf4b.png)
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解答题-问答题
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适中
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解题方法
【推荐1】设四边形
为矩形,点
为平面
外一点,且
平面
,若
,
.在
边上是否存在一点
,使得点
到平面
的距离为
,若存在,求出
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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4180c271831327644dc83240b715b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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解答题-证明题
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适中
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解题方法
【推荐2】如图所示,在等腰梯形
中,
,
,
,将三角形
沿
折起,使平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/bb31c0d0-2f7a-436c-9e18-db0f6fbc7733.png?resizew=376)
(1)求证:
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c222af0efeece1ad406df99e32f160e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/bb31c0d0-2f7a-436c-9e18-db0f6fbc7733.png?resizew=376)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1719410d21e3de1242366ce2965e838c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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解答题-证明题
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【推荐1】如图,在直三棱柱ABC-A1B1C1中,AC=BC,点M为棱A1B1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/bc50d225-a87b-4526-80d6-39d4b381949e.png?resizew=135)
求证:(1)AB∥平面A1B1C;
(2)平面C1CM⊥平面A1B1C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/bc50d225-a87b-4526-80d6-39d4b381949e.png?resizew=135)
求证:(1)AB∥平面A1B1C;
(2)平面C1CM⊥平面A1B1C.
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【推荐2】如图,四边形
与四边形
是全等的矩形,
.
(1)若P是棱
的中点,求证:平面
平面
;
(2)若P是棱
上的点,直线BP与平面
所成角的正切值为
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cacb5e127e36bc0d2fe22398849c46.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/39c1bc63-55bc-4ede-a75d-79a427f0ff40.png?resizew=232)
(1)若P是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6f775b7677f38503d77a7daf2dce85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9275cb08430f635054519c543b72303f.png)
(2)若P是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dedfba8b9447a4db53baae62fdeebfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b330018216e02c49a6621b6c964ccd3c.png)
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