2019高三·全国·专题练习
1 . 如图,在长方形ABCD中,AB=2,BC=1,E为DC的中点,F为线段EC上(端点除外)一动点,现将△AFD沿AF折起,使平面ABD⊥平面ABCF.在平面ABD内过点D作DK⊥AB,K为垂足,设AK=t,则t的取值范围是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/fa2a675c-a220-47dc-b812-399f366c6e76.png?resizew=381)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/fa2a675c-a220-47dc-b812-399f366c6e76.png?resizew=381)
A.(![]() | B.(![]() |
C.(![]() | D.(![]() |
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解题方法
2 . 在
中,已知
,
,
,
是边
上一点,将
沿
折起,得到三棱锥
.若该三棱锥的顶点
在底面
的射影
在线段
上,设
,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aff008bf9d674fee28e3b4514d0b1c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f2a9b923a355694ea487f6c5669a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
2019-12-06更新
|
687次组卷
|
2卷引用:浙江省宁波市慈溪市三山高级中学等六校2019-2020学年高二上学期期中数学试题
名校
解题方法
3 . 在《九章算术》中,将四个面都为直角三角形的四面体称之为鳖臑.如图,在鳖臑
中,
平面
,
,且
,过点
分别作
于点
,
于点
,连结
,当
的面积最大值时,
( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/afa03cdd-5cd6-4624-9ddf-ead2147f4780.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9fd9540710e56838940d36d8a4802e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc216d456790748fda154e2c73d0c4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/afa03cdd-5cd6-4624-9ddf-ead2147f4780.png?resizew=153)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
4 .
中,已知
,
,
,D是边AC上一点,将
沿BD折起,得到三棱锥
.若该三棱锥的顶点A在底面BCD的射影M在线段BC上,设
,则x的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8b709a173120436dac669c74b927d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71d6ca4e417cbd76b24de11d81e0091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f2a9b923a355694ea487f6c5669a04.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-10-21更新
|
1239次组卷
|
2卷引用:四川省成都市石室中学2019-2020学年高三上学期入学考数学(理)试题
5 . 如图④,已知三棱锥
,将其三个侧面翻折到平面ABC内.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/b325e72e-189e-4524-a5de-6d782238939f.png?resizew=381)
(1)若构成
,且
,如图②,则三棱锥中
是否成立?
(2)若构成图③,且
,是否有
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/b325e72e-189e-4524-a5de-6d782238939f.png?resizew=381)
(1)若构成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ac2dd55fa98f9bf10fcd95ce3169c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9986c9e2fc781f7e7b927659612248a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
(2)若构成图③,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9986c9e2fc781f7e7b927659612248a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
您最近一年使用:0次
名校
6 . 已知四边形
是矩形,
,将
沿着对角线AC翻折,得到
,设顶点
在平面
上的投影为O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/7e9f8b3f-0bd5-4597-b4c4-d6c4ea98b03d.png?resizew=220)
(1)若点O恰好落在边AD上,①求证:
平面
;②若
,
,当BC取到最小值时,求k的值;
(2)当
时,若点O恰好落在
的内部(不包括边界),求二面角
的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac341f7091a0995ef697fb77a905e7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510b85dfbca0e3ab0744655d77e8c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/7e9f8b3f-0bd5-4597-b4c4-d6c4ea98b03d.png?resizew=220)
(1)若点O恰好落在边AD上,①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5ea81e1191a8c964934a1c233e9d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e281fa238514df41ec02e17313640d0d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9173b446b8ff3ec5506540f277d93a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de25bd0a6911c52d0d319c2318a67ef7.png)
您最近一年使用:0次
名校
7 . 如图,四棱锥
中,底面
为矩形,
底面
,
,点E是棱PB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/490cbe02-6b98-4f5a-8878-25d268051807.png?resizew=157)
(1)证明:
;
(2)若
,求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f235e99b0b55ac252c4b18cc315dc114.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/490cbe02-6b98-4f5a-8878-25d268051807.png?resizew=157)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4486d52b6e410fd7b60428121d96cef.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f06184f021ac21d72de1c7f55b0778.png)
您最近一年使用:0次
2020-04-21更新
|
529次组卷
|
2卷引用:青海省海东市平安县第一高级中学2017-2018学年高二上学期期中考试数学(A卷)试题
8 . 在平行四边形
中,
,点
在
边上,
,将
沿直线
折起成
,
为
的中点,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.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/1b15a1cd9af365070283fcc24a383954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dbf33492e5223df78dea34a24ae015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
A.直线![]() ![]() | B.![]() |
C.![]() | D.![]() |
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名校
9 . 如图是正四面体的平面展开图,
分别是
的中点,在这个正四面体中:①
与
平行;②
与
为异面直线;③
与
成60°角;④
与
垂直.以上四个命题中,正确命题的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/d22d9ccc-90f1-4c23-b9e4-4d5e567bfc28.png?resizew=142)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf4c0cf23f0f3291f79a79e90782d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23a530d1c518b8318177e57f2011113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/d22d9ccc-90f1-4c23-b9e4-4d5e567bfc28.png?resizew=142)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2019-12-08更新
|
442次组卷
|
5卷引用:【全国市级联考】山西省太原市2018届高三第三次模拟考试理科数学试题
【全国市级联考】山西省太原市2018届高三第三次模拟考试理科数学试题河北衡水中学2018届高三数学理科三轮复习系列七-出神入化6(已下线)专题8.3 空间点、直线、平面之间的位置关系(练)-浙江版《2020年高考一轮复习讲练测》(已下线)专题8.3 空间点、直线、平面之间的位置关系(练)-2021年新高考数学一轮复习讲练测重庆市缙云教育联盟2022-2023学年高一下学期期末数学试题
名校
10 . 如图,在四棱锥
中,已知
平面
,且四边形
为直角梯形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/cbc8925c-378a-42bd-b2d2-a2ea44747bbb.jpg?resizew=178)
(1)证明:
;
(2)求平面
与平面
所成锐二面角的余弦值;
(3)点
是线段
上的动点,当直线
与
所成的角最小时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d3947804a878a87052c266be475423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/cbc8925c-378a-42bd-b2d2-a2ea44747bbb.jpg?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
您最近一年使用:0次
2019-11-10更新
|
1435次组卷
|
3卷引用:上海市七宝中学2017-2018学年高二下学期期中数学试题
上海市七宝中学2017-2018学年高二下学期期中数学试题安徽省阜阳市第三中学2019-2020学年高二上学期第二次调研考试数学(理)试题(已下线)专题5.8 期末考前选做30题(解答题压轴版)-2020-2021学年高二数学下学期期末专项复习(沪教版)