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解题方法
1 . 在空间四边形ABCD中,
,记二面角
的大小为
,当
时,直线AB与CD所成角的余弦值的取值范围是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360568fae48a5f915423de68deada202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e41f63c691f19627c3ce5957fd2a415.png)
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2 . 设
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0aff870ddb04248f2f23088c311f56.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ad78dc8b8aed907b4fe9640c997454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1951315975e17f0f679048bd25dc1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0aff870ddb04248f2f23088c311f56.png)
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3 . 已知正方体
的棱长为1,
,
,
分别在
,
,
上,并满足
(
),若
是
的重心,且
,则实数
值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94ce22f30a8de2af135de3c89403aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe620619173c9d252ffb8b998ab1570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65cbe9ae7ad963bbc34751972407a6e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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4 . 设随机变量
的分布列为
(
),则实数
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0973a3e17dc1abd2edbdfa50bc866967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5869653c67df9d50dd7f0cbb08d468f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 由数据
可得
关于
的线性回归方程为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67dd3df2203ad477a391ce4da2bc71bb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0d7f2407d2675876ad46a6a3d7cfb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a01a9162e86ae5838e19158942f4b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eabb220259c8e9c24db37b5f96185add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67dd3df2203ad477a391ce4da2bc71bb.png)
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6 . 已知集合
,记集合
的元素个数为
.当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056d6e45df3b36b7ace1c1e0d3f16d8d.png)
__________ (用数字表示);当
(
且
)时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056d6e45df3b36b7ace1c1e0d3f16d8d.png)
__________ .(用含有
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2590bb37cb7630923a429d4a1d847efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8b3217efbef2d705f5beedb40c1fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddbd996153d8fa0640bae56e0328c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056d6e45df3b36b7ace1c1e0d3f16d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de99e0441b45f322a34566393e022f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4613271f782a90ab580131d09d03d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056d6e45df3b36b7ace1c1e0d3f16d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解题方法
7 . 小明想邀请8位朋友中的5位参加自己的生日宴会,其中甲、乙不能同时邀请,甲、丙要么都邀请,要么都不邀请,则不同的邀请方法种数为__________ .
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解题方法
8 . 已知随机变量
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870528aa6be6f56bae0eb6b10a765c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bed89638668bd715e6278c382091c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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9 . 不等式
,其中
的解集为__________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86193ac53839aeb939aeb893383c7de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9aabd59a4d426490f6ae9fb6f324acc.png)
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解题方法
10 . 如图,平行六面体
,其中,以顶点A为端点的三条棱长均为2,且它们彼此的夹角都是
,则异面直线
与
所成角的正切值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/6ef00adc-b160-4142-a54a-acec56f7c8df.png?resizew=183)
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