1 . 单位正方体
中,
为
的中点.求异面直线
与
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
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2 . 在三棱锥
中,
,
,点
到
中点的距离为
,侧面
、侧面
、侧面
与底面所成二面角的大小均为
.则三棱锥的体积大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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3 . 半径为l的球的内接圆锥的最大体积是______ .
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4 . 已知正方体
表面正方形的对角线中存在异面直线.若其中两条异面直线的距离为l,则正方体的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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5 . 在半径为4的大球内,已任意放了24个棱长为l的正方体.证明:在大球内至少还可以放置4个半径为
的小球,使得这些小球及正方体都在大球内且相互不重叠.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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6 . 已知正四棱锥
的五个顶点在同一球面上.若该四棱锥的体积为
,则球的表面积的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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7 . 如图,已知在四面体
中,棱
两两垂直,
作平行于底面
的截面
,使
与底面
的距离为1,类似作其他三个截面
求四个截面交成的小四面体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4532ccd4d3192e17a80a990459af30ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2b9e2b5aff25de6b168f1e60721b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5027544c22a8ef76134654411a5eb108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5027544c22a8ef76134654411a5eb108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607adf5293315d9618623e4bd6d917d1.png)
![](https://img.xkw.com/dksih/QBM/2018/12/25/2104413465681920/2106386902638592/STEM/f19bcfec-4989-4624-bb5e-23d7f5b2a4b6.png?resizew=252)
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8 . 已知平行六面体
的体积为
,
、
、
分别为棱
、
、
的中点.则棱锥
的体积为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.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/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b06463bed470f6fbc8e395a1d5297b7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 椭圆面积公式
可由圆的面积公式
得出:只需将圆沿着一个方向“拉长”即可.仿此,若一个椭圆半长轴、半短轴分别为
、
,将其以长轴为轴旋转
,得到的“椭球”的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30489cd9c57a2c6283e0fc36129728c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595923c90cd53d23df79ce137138aafc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
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10 . 已知P、Q、R、S是三棱锥A -BCD 内的四点,且Q、R、S、P分别是线段PA、QB、RC、SD的中点.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff385de970e32ab3f45aa9a905e83872.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff385de970e32ab3f45aa9a905e83872.png)
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