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1 . 如图,在四棱锥P-ABCD中,底面ABCD是菱形,PA=PD,∠DAB=60°.
![](https://img.xkw.com/dksih/QBM/2019/9/29/2301162601684992/2301246641479680/STEM/04dce26732d2451eb4decd71edad02d0.png?resizew=263)
(1)证明:AD⊥PB.
(2)若PB=
,AB=PA=2,求三棱锥P-BCD的体积.
![](https://img.xkw.com/dksih/QBM/2019/9/29/2301162601684992/2301246641479680/STEM/04dce26732d2451eb4decd71edad02d0.png?resizew=263)
(1)证明:AD⊥PB.
(2)若PB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
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2019-09-29更新
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4卷引用:2019年贵州省贵阳市高三8月摸底数学(文)试题
2 . 如图
,
是圆柱的上、下底面圆的直径,
是边长为2的正方形,
是底面圆周上不同于
两点的一点,
.
![](https://img.xkw.com/dksih/QBM/2017/9/19/1777177656385536/1777396726784000/STEM/784ff24931954655832ef26ab2b7b587.png?resizew=132)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://img.xkw.com/dksih/QBM/2017/9/19/1777177656385536/1777396726784000/STEM/784ff24931954655832ef26ab2b7b587.png?resizew=132)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24db75f4d450674182ccfe3236aabdd3.png)
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2017-09-02更新
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4卷引用:贵州省贵阳市普通高中2018届高三8月摸底考试数学(理)试题
贵州省贵阳市普通高中2018届高三8月摸底考试数学(理)试题贵州省遵义市南白中学2018届高三上学期第一次月考数学(理)试题(已下线)2018年10月14日 《每日一题》一轮复习理数-每周一测西藏昌都市第一高级中学2021届高三上学期期末考试数学(理)试题
3 . 某实心几何体是用棱长为
的正方体无缝粘合而成,其三视图如图所示,则该几何体的表面积为
![](https://img.xkw.com/dksih/QBM/2017/9/19/1777177656385536/1777396726579200/STEM/a2a4421e3e0f463bacd940b2093f63c7.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://img.xkw.com/dksih/QBM/2017/9/19/1777177656385536/1777396726579200/STEM/a2a4421e3e0f463bacd940b2093f63c7.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-09-02更新
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336次组卷
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2卷引用:贵州省贵阳市普通高中2018届高三8月摸底考试数学(理)试题