1 . 已知m,n是空间中两条不同的直线,
,
是两个不同的平面,则下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.若![]() ![]() ![]() ![]() | B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() | D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
2018-12-17更新
|
1079次组卷
|
2卷引用:【全国百强校】四川省绵阳中学2018届高三高考三模数学试题(理科)试题
名校
2 . 在
中,若
,
,
,斜边
上的高为
,则有结论
,运用类比方法,若三棱锥的三条侧棱两两个互相垂直且长度分别为
,
,
,三棱锥的直角顶点到底面的高为
,则有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060d1cfa345a83186e3d63fa10a57645.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7845fd89477ecc808e5519317fff78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5140a040d36ee7c59400f94f74c68b38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228ea9dd1d190f91ca46752ef6a6d921.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060d1cfa345a83186e3d63fa10a57645.png)
您最近一年使用:0次
2018-12-14更新
|
1025次组卷
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2卷引用:【校级联考】浙江省浙东北(ZDB)教学联盟2018-2019学年高二上学期期中考试数学试卷
名校
3 . 在等腰直角
中,
,
,
为
中点,
为
中点,
为
边上一个动点,
沿
翻折使
,点
在平面
上的投影为点
,当点
在
上运动时,以下说法错误的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/a79600a3-a577-4693-8bd4-d3ccd630fc34.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205cd2da7d60aa6292ff6c1852080df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87794e971d574241255522dcf20ddea8.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/b06586df4b4f439b97323545caa1c26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41c43c614db8262fce65f55384679dd.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/1dde8112e8eb968fd042418dd632759e.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/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/a79600a3-a577-4693-8bd4-d3ccd630fc34.png?resizew=152)
A.线段![]() | B.![]() |
C.线段![]() ![]() | D.点![]() |
您最近一年使用:0次
2019-03-29更新
|
1392次组卷
|
6卷引用:2017届浙江省杭州市高三4月教学质量检测(二模)数学试卷
2017届浙江省杭州市高三4月教学质量检测(二模)数学试卷【市级联考】广东省梅州市2019届高三总复习质检理科数学试题江西省赣州市南康区南康中学2019-2020学年高二上学期10月月考数学试题2(已下线)重难点突破04 立体几何中的轨迹问题(六大题型)(已下线)第三章 空间轨迹问题 专题五 微点2 翻折、旋转问题中的轨迹问题综合训练【培优版】(已下线)第三章 折叠、旋转与展开 专题一 平面图形的翻折、旋转 微点8 平面图形的翻折、旋转综合训练
名校
4 . 如图所示,已知
面
,
于
,
,令
,
,则( )
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084527025283072/2090267748769792/STEM/719dc64bfcb3482eab75ce1eb14f0788.png?resizew=128)
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7839dc3cab5f2bf59f8830d8b3966794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6c4c6634ae6d9918828c595743d130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096727a1bc7ffa667e16ece427c88384.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084527025283072/2090267748769792/STEM/719dc64bfcb3482eab75ce1eb14f0788.png?resizew=128)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2018-12-05更新
|
912次组卷
|
4卷引用:【区级联考】上海市杨浦区统考2019届高三上学期期中考试数学试题
【区级联考】上海市杨浦区统考2019届高三上学期期中考试数学试题【全国百强校】江苏省海安高级中学2018-2019学年高一下学期期中考试数学试题2(已下线)重难点05 空间向量与立体几何-2021年高考数学【热点·重点·难点】专练(上海专用)(已下线)重难点04 三角函数与解三角形-2021年高考数学【热点·重点·难点】专练(上海专用)
5 . 如图所示,在三棱锥
中,
平面
,
为直角三角形,
,过点
分别作
,
,
,
分别为垂足.
![](https://img.xkw.com/dksih/QBM/2018/1/1/2084572131926016/2085137944666112/STEM/2b7eb3a8-62c8-4ddc-87e4-ae2afd436397.png?resizew=264)
(1)求证:平面
平面
.
(2)求证:
.
(3)若
为
上的一点,且满足
平面
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2aaed1e9ead175f30f7130569d0411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da6815bc213dfd78c2f77cd7ded8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c7b4362048bee119dee0566627fdcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142046e55d5463685a638e00e4cdc3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2018/1/1/2084572131926016/2085137944666112/STEM/2b7eb3a8-62c8-4ddc-87e4-ae2afd436397.png?resizew=264)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566866c39352ba27f4179ac1f3a20c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840798a31aba0783f96584e0ad7c0d2e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f554121def455fa4dd680aca4ce39943.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c342d680d4a0666af80966bc8a5a3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d39f37441ee55dbc8f1a6ca199a66b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4239907252eb3abc4cb25def6e50771d.png)
您最近一年使用:0次
解题方法
6 . 如图,PO是三棱锥P-ABC底面ABC的垂线,垂足为O.
![](https://img.xkw.com/dksih/QBM/2019/1/13/2118008175435776/2118441592389632/STEM/4dc3d324cfac4530a8148980bc37ea2b.png?resizew=265)
①若PA⊥BC,PB⊥AC,则点O是△ABC的垂心;
②若PA=PB=PC,则点O是△ABC的外心;
③若∠PAB=∠PAC,∠PBA=∠PBC,则点O是△ABC的内心;
④过点P分别作边AB,BC,AC的垂线,垂足分别为E,F,G,若PE=PF=PG,则点O是△ABC的重心.
以上推断正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2019/1/13/2118008175435776/2118441592389632/STEM/4dc3d324cfac4530a8148980bc37ea2b.png?resizew=265)
①若PA⊥BC,PB⊥AC,则点O是△ABC的垂心;
②若PA=PB=PC,则点O是△ABC的外心;
③若∠PAB=∠PAC,∠PBA=∠PBC,则点O是△ABC的内心;
④过点P分别作边AB,BC,AC的垂线,垂足分别为E,F,G,若PE=PF=PG,则点O是△ABC的重心.
以上推断正确的个数是( )
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
解题方法
7 . 在直三棱柱
中,
.有下列条件:
①
;
②
;
③
.
其中能成为
的充要条件的是__________ .(填上序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4fcf607b0710d12aaabd17fd053d83.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cd4fd97a975f810756a0b1324dcc93.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
其中能成为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98faac7a82235d53bb4b6abe7ee54951.png)
![](https://img.xkw.com/dksih/QBM/2018/7/20/1992743590551552/1993795374587904/STEM/b0083cc9b43f4ad7a125d93e958069c7.png?resizew=206)
您最近一年使用:0次
2018高三·全国·专题练习
解题方法
8 . 如图,正方形
中,
,
与
交于
点,现将
沿
折起得到三棱锥
,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/32d5434e-367b-4739-8108-a57585e27c1c.png?resizew=483)
(1)求证:
;
(2)若三棱锥
的最大体积为
,当三棱锥
的体积为
,且
为锐角时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2970d638e7993b609106d2ddd65e591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8134b1163ca3cd2e34ff17fc81078c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5326159a6399c85b323e12469433396c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/32d5434e-367b-4739-8108-a57585e27c1c.png?resizew=483)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5423ad8772686f3d07d01dfef9a4c0d0.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5326159a6399c85b323e12469433396c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc2138465121c66817b1301fd770b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5326159a6399c85b323e12469433396c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023090e6ffbdb0add119fd7170863182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718c0b864dc534d2fc62f0f61bbf2d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de5912adb72a65515b87221ff13e6d5.png)
您最近一年使用:0次
9 . 在正方体
中,
为棱
上一点,且
,以
为球心,线段
的长为半径的球与棱
分别交于
两点,则
的面积为( )
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5eccc39cb0cf100cefcfd354d171dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53db8172cc5e32fbe094aed3bb77f420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5225e75e359a1aaac75c19bba1c338d9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
10 . 已知正方体
的棱长为
,点
是
的中点,点
是
内的动点,若
,则点
到平面
的距离的范围是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7941b1b4e6476e08e3259b22b3bca438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/467c6398ec2c557fdd253013bd2519e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
您最近一年使用:0次
2018-05-21更新
|
769次组卷
|
2卷引用:【全国百强校】云南省昆明第一中学2018届高三第八次月考--理科数学