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解题方法
1 . 在棱长为2的正方体ABCD-A1B1C1D1中,E是棱DD1的中点,F在侧面CDD1C1上运动,且满足B1F//平面A1BE.以下命题正确的有( )
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868824172568576/2874385484816384/STEM/4c13572a19e74c1eaf40d4e830c1929b.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868824172568576/2874385484816384/STEM/4c13572a19e74c1eaf40d4e830c1929b.png?resizew=192)
A.点F的轨迹长度为![]() |
B.直线![]() |
C.平面A1BE与平面CDD1C1所成锐二面角的正切值为![]() |
D.过点E,F,A的平面截正方体所得的截面面积最大为![]() |
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2 . 如图,在正方体
中,点M,N分别为棱
上的动点(包含端点),则下列说法正确的是_____________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/65aec8f5-f26a-4d32-ac7f-88ca59db064c.png?resizew=165)
①当M为棱
的中点时,则在棱
上存在点N使得
;
②当M,N分别为棱
的中点时,则在正方体中存在棱与平面
平行;
③当M,N分别为棱
的中点时,则过
,M,N三点作正方体的截面,所得截面为五边形;
④若正方体的棱长为2,则三棱锥
的体积可能为1;
⑤直线
与平面
所成角的正切值的最小值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281ed7ea4b53f930ebf1bd142893e3b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/65aec8f5-f26a-4d32-ac7f-88ca59db064c.png?resizew=165)
①当M为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fae8e33cd86fa8dab72704eaafe1ba.png)
②当M,N分别为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281ed7ea4b53f930ebf1bd142893e3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e74395b07e8153a0ef0bbcb5881013f.png)
③当M,N分别为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281ed7ea4b53f930ebf1bd142893e3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
④若正方体的棱长为2,则三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95116284af5cbe14446e6a57bf464a45.png)
⑤直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
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3 . 已知三棱锥
三条侧棱
两两互相垂直,且
,
分别为该三棱锥的内切球和外接球上的动点,则
两点间距离的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bb1063e139610045f3bca5ca0b2766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b4c1ae9c57d51e27bbdb001122d3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图, 已知矩形
平面
, 且
, 点
为线段
(除端点外) 上的一点. 沿直线
将
向上翻折成
,
为
的中点, 则下列说法正确的有 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f19ab5a0-39e9-46dc-9ddd-76f6bfc4dbb6.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc07ffa235cb0aab110dfeaf4e25f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f9c64303370347131dd9d8c5c70c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f19ab5a0-39e9-46dc-9ddd-76f6bfc4dbb6.png?resizew=179)
A.三棱锥![]() ![]() |
B.当点![]() ![]() ![]() |
C.当点![]() ![]() ![]() |
D.当点![]() ![]() ![]() ![]() |
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5 . 已知四面体
的每个顶点都在球O(О为球心)的球面上,
为等边三角形,
,
,且
,则二面角
的正切值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a05e0ab55e325fb3b85fc8ca9c27c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345d6db266003b4aebea44c46c10fabe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 在棱长为3的正方体
中,点
满足
,点
在平面
内,则
的最小值为( )
![](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/f88e2d52a6444ab3d2786fea9a7f4b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09d2844f6aa33078456db9afa60533a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 如图,底面ABCD为边长是4的正方形,半圆面
底面ABCD.点P为半圆弧
(不含A,D点)一动点.下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858059613036544/2861950779047936/STEM/1fdf1a2c0cb940afaf49d9a0be9d7d29.png?resizew=311)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3e2bed5ce5fe466395d2f5743d335b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858059613036544/2861950779047936/STEM/1fdf1a2c0cb940afaf49d9a0be9d7d29.png?resizew=311)
A.三棱锥P—ABD的每个侧面三角形都是直角三角形 |
B.三棱锥P—ABD体积的最大值为![]() |
C.三棱锥P—ABD外接球的表面积为定值![]() |
D.直线PB与平面ABCD所成最大角的正弦值为![]() |
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8 . 已知△ABC在平面
内,不重合的两点P,Q在平面
同侧,在点M从P运动到Q的过程中,记四面体M-ABC的体积为V,点A到平面MBC的距离为d,则可能的情况是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.V保持不变,d先变大后变小 | B.V保持不变,d先变小后变大 |
C.V先变大后变小,d不断变大 | D.V先变小后变大,d不断变小 |
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9 . 已知实数
,
,
,
满足
,
,
,则
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb32baabe10eeabdb867e296ad63783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102c4b6b476f28460083508db8c54024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da3ff6f17be99ec311610efa08ba002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979df095c33a0d8edce5c1fab7cad04.png)
A.6 | B.8 | C.![]() | D.12 |
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10 . 最近国际局势波云诡谲,我国在某地区进行军事演练,如图,
,
,
是三个军事基地,
为一个军事要塞,在线段
上.已知
,
,
到
,
的距离分别为
,
,以点
为坐标原点,直线
为
轴,建立平面直角坐标系如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/ed3f4810-b024-4b71-9ce6-536233fb061c.png?resizew=209)
(1)求两个军事基地
的长;
(2)若要塞
正北方向距离要塞
处有一
处正在进行爆破试验,爆炸波生成
时的半径为
(参数
为大于零的常数),爆炸波开始生成时,一飞行器以
的速度自基地
开往基地
,问参数
控制在什么范围内时,爆炸波不会波及到飞行器的飞行.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/680539f278ec48e26adb0107b5f87fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfadbfcdc92e26ab92a17265a3a22c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870cd01b72fc36199688bc1be099a86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba598fd9ca10bbb214c96c80831404d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/ed3f4810-b024-4b71-9ce6-536233fb061c.png?resizew=209)
(1)求两个军事基地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若要塞
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5a1095f11a367fc0bfdd114211fab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ee630252dc9ec9c8453d1561a81743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ae2d0aa744ab9116e1bfa78564d9b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91b5dff713a13b8a7f1fc546719f5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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