如图,几何体
中,
为边长为2的正方形,
为直角梯形,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/6c38e6fe-ba1b-499e-b453-623c674a866b.png?resizew=180)
(1)求证:
平面
;
(2)求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb476b0dac9799c720354d30b3a85c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/6c38e6fe-ba1b-499e-b453-623c674a866b.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
(2)求几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
更新时间:2023-12-15 16:58:04
|
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解答题-作图题
|
适中
(0.65)
解题方法
【推荐1】某小区楼顶成一种“楔体”形状,该“楔体”两端成对称结构,其内部为钢架结构(未画出全部钢架,如图1所示,俯视图如图2所示),底面
是矩形,
米,
米,屋脊
到底面
的距离即楔体的高为1.5米,钢架所在的平面
与
垂直且与底面的交线为
,
米,
为立柱且O是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500242658082816/2500319997640704/STEM/06d102dcf6c24867958acd80ea80af10.png?resizew=385)
(1)求斜梁
与底面
所成角的大小(结果用反三角函数值表示);
(2)求此模体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a44328f6afdcc885f0cc21247c1e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1828e73ec5e00f95aa11ff74c703a5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87f9586b708869fd7186e75a75c1dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500242658082816/2500319997640704/STEM/06d102dcf6c24867958acd80ea80af10.png?resizew=385)
(1)求斜梁
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求此模体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.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2】如图,在三棱柱
中,
⊥
,AB=AC=1,D是BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/a204ee70-5d03-4898-a4ef-d61862e5bf17.png?resizew=161)
(1)求证:
//平面
;
(2)若面
⊥面ABC,
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/a204ee70-5d03-4898-a4ef-d61862e5bf17.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
(2)若面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762d959a8fe662df26568e458c4ef394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778ddb5cd565f3e96697aee202b9d510.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1,在△MBC中,
,A,D分别为棱BM,MC的中点,将△MAD沿AD折起到△PAD的位置,使
,如图2,连结PB,PC,BD.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897682652315648/2917084287582208/STEM/76a645b3-9dbc-4243-bb2e-65ceb1457dbe.png?resizew=285)
(1)求证:平面PAD⊥平面ABCD;
(2)若E为PC中点,求直线DE与平面PBD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36eab98c6833c1bda76af488bc60d823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f17680a23635f823b7dc446e4f3b0a.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897682652315648/2917084287582208/STEM/76a645b3-9dbc-4243-bb2e-65ceb1457dbe.png?resizew=285)
(1)求证:平面PAD⊥平面ABCD;
(2)若E为PC中点,求直线DE与平面PBD所成角的正弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,四棱锥
中,
底面
,
,
,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2020/3/1/2410295828226048/2411782686670848/STEM/80f55cb9-3869-4c3c-842d-5256a6b9781b.png)
(1)求证:
平面
;
(2)若
,
,
,求四棱锥
的体积;
![](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/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a763381e4a9e6ac9d9c1df51122570f8.png)
![](https://img.xkw.com/dksih/QBM/2020/3/1/2410295828226048/2411782686670848/STEM/80f55cb9-3869-4c3c-842d-5256a6b9781b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次