解题方法
1 . 在矩形
中,
,
,沿对角线
将矩形折成一个大小为
的二面角
,当点B与点D之间的距离为3时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4961a7dd688b8a12db7d1d3480c6b87f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4961a7dd688b8a12db7d1d3480c6b87f.png)
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23-24高二上·上海·课后作业
2 . 已知
是平行六面体.设
是底面
的中心,
是侧面
的对角线
上的点,且
,设
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668b7f96888281bb83fe5c96411fc0cf.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545decfe4dd2dcf6f24da7363c1bd023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5757e6c28bc7651d76952457ad889a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ea23c136291a944c73c576a558203a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668b7f96888281bb83fe5c96411fc0cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/f5a26915-7b4a-46da-bba7-3bb81ea59e04.png?resizew=178)
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3 . 平行六面体
中,
,
,
,动点
在直线
上运动,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29325f51647dde45ffa565600d353d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e90a1c4f1c3f38cb2f2adfc9cbea3ee.png)
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4 . 如图,在四面体
中,
分别是
上的点,且
是
和
的交点,以
为基底表示
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ce0da153621bbd05519f168b527e3e.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a337a934b801730321f67b0e5a0b144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85a08b7404da7ee0fa373540966176b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1408c55c40465b26758562f59d99ae41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6d728b430549f00bb9c0a7bf8bf7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ce0da153621bbd05519f168b527e3e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/fb89f17c-87a6-403f-bc75-f41656266583.png?resizew=154)
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2024高三·全国·专题练习
5 . 如图,在斜棱柱ABCDA1B1C1D1中,AC与BD的交点为点M,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec8080b2a3031920c9bc66cbc3f94f1.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e984585ddf28c039219afcebf229de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8780f5b68f8907a57c1c2f96233a78c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec8080b2a3031920c9bc66cbc3f94f1.png)
![](https://img.xkw.com/dksih/QBM/2024/3/4/3446226545065984/3446564190617600/STEM/89bc11c2b1cd4d749a578379b9bf23a9.png?resizew=127)
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6 . 在三棱锥
中,
,
,点
在
上,
,
为
中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb53a5e73f95e3f46a34965c5c0ac73.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ccad4025134a601044fbc58f1cf4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3744bb598bb9292a98812dddf9fdb3cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6aa2a7c840613899fac45f7dd04789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb53a5e73f95e3f46a34965c5c0ac73.png)
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7 . 已知空间向量
的模长分别为1,2,3,且两两夹角均为
,点
为
的重心,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ad85b1b027a45ce5cbde9ed1fd9632.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12e912c56b58fc780489fab055aa94b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ad85b1b027a45ce5cbde9ed1fd9632.png)
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名校
解题方法
8 . 如图,在三棱锥
中,
,点
在线段
上,且
,则直线
与直线
所成角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c65156d88c8787bf697d6c4fd8f21e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0cf3de61b5492989ae2002e19de770a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2023/12/23/3395591015309312/3396069057093632/STEM/bf147f21eb464843ab74887eb976a6df.png?resizew=177)
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2023-12-24更新
|
830次组卷
|
4卷引用:专题02 求空间角及空间向量的应用(三大类型)
名校
解题方法
9 . 在
中,各个顶点与对边中点连线,相交于一点,定义为三角形的重心
,此时易得
.类似在三棱锥
中,各个顶点分别与对面三角形的重心的连线,相交于一点,定义为三棱锥的重心G.若设
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed01752720107c196e5738d232666a7b.png)
____________ .(用
、
、
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1341c228b360108b6ae2d5bee95a8ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d9ac737639ad7ce99887f9ef07685c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20a9410ceb649e303910f8efe5f7531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbadd77fde781d924b14e6dc57505ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed01752720107c196e5738d232666a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
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