名校
解题方法
1 . 在直角梯形PBCD中,∠D=∠C
,BC=CD=2,PD=4,A为PD的中点,如图1,将△PAB沿AB折到△SAB的位置,使SB⊥BC,点E在SD上,如图2.
![](https://img.xkw.com/dksih/QBM/2020/1/18/2386731414036480/2421764050567168/STEM/9d925f8df0834137aad85fc1ca90c5d0.png?resizew=451)
(1)求证:SA⊥平面ABCD;
(2)若E为SD中点,求D点到面EAC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894eb4e624079ad1d9aa1a5b30a38ba3.png)
![](https://img.xkw.com/dksih/QBM/2020/1/18/2386731414036480/2421764050567168/STEM/9d925f8df0834137aad85fc1ca90c5d0.png?resizew=451)
(1)求证:SA⊥平面ABCD;
(2)若E为SD中点,求D点到面EAC的距离.
您最近一年使用:0次
2 . 已知直线
与
轴相交于点
,点
坐标为
,过点
作直线
的垂线,交直线
于点
.记过
、
、
三点的圆为圆
.
(1)求圆
的方程;
(2)求过点
与圆
相交所得弦长为
的直线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac945fef7572e362007c4f5bfc4c39f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/c3ae1b361135eaae8d172cb7aa490d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/ac047e91852b91af639feec23a9598b2.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)求过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
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3 . 已知椭圆
的左、右焦点分别为
,过点
的直线
与椭圆
相切于点
,与
轴交于点
,又椭圆的离心率为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/b1a449cc-fa0c-4c34-84bc-ae258fa4aa94.png?resizew=209)
(1)求椭圆
的方程;
(2)圆
与直线
相切于点
,且经过点
,求圆
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993769b494e12c21dff0ee7c53a4a49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56286216c1c313e19f4a196fcaba6b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/b1a449cc-fa0c-4c34-84bc-ae258fa4aa94.png?resizew=209)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
名校
4 . 如图①所示,四边形
为等腰梯形,
,且
于点
为
的中点.将
沿着
折起至
的位置,使得平面
平面
,得到如图②所示的四棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/af2fd598-ef45-4147-b869-0285bfcbd60f.png?resizew=437)
(1)求证:
;
(2)求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247e96a3a378741eb42dda3837ea5c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/353732838789714499619085201305c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33719580ce50fafc3a27eb7039be8a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/decee6072217173778edc84db382f97b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/af2fd598-ef45-4147-b869-0285bfcbd60f.png?resizew=437)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c723ad583a4009b7a5dd515e7e02b8a.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7f857869bc6084d128e8c13f5c115c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
您最近一年使用:0次
5 . 在平面直角坐标系xOy中,对于⊙O:x2+y2=1来说,P是坐标系内任意一点,点P到⊙O的距离SP的定义如下:若P与O重合,SP=r;若P不与O重合,射线OP与⊙O的交点为A,SP=AP的长度(如图).
(1)直线2x+2y+1=0在圆内部分的点到⊙O的最长距离为_____ ;
(2)若线段MN上存在点T,使得:
①点T在⊙O内;
②∀点P∈线段MN,都有ST≥SP成立.则线段MN的最大长度为_____ .
(1)直线2x+2y+1=0在圆内部分的点到⊙O的最长距离为
(2)若线段MN上存在点T,使得:
①点T在⊙O内;
②∀点P∈线段MN,都有ST≥SP成立.则线段MN的最大长度为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5e9a70be-a49c-4aa7-9aa6-a7fbf3bca827.png?resizew=125)
您最近一年使用:0次
名校
解题方法
6 . 如图,四棱锥
中,底面
是正方形,
底面
.
![](https://img.xkw.com/dksih/QBM/2020/3/11/2417271005945856/2417893562458112/STEM/3ddce55118aa4ef98e36eae7960777db.png?resizew=177)
(1)求证:
平面
;
(2)若
,求点
到平面
的距离.
![](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://img.xkw.com/dksih/QBM/2020/3/11/2417271005945856/2417893562458112/STEM/3ddce55118aa4ef98e36eae7960777db.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03eb62330742830c9feea17037739dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2020-03-12更新
|
1099次组卷
|
3卷引用:贵州省2017年12月普通高中学业水平考试数学试题
名校
7 . 圆心在x轴上,且与双曲线
的渐近线相切的一个圆的方程可以是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e3e09751ab27d455c25be58ea6af37.png)
您最近一年使用:0次
2020-03-07更新
|
279次组卷
|
2卷引用:北京市大兴区2019~2020学年度高三第一学期期末检测数学试题
解题方法
8 . 在
中,
,
,
是
边上的中线,将
沿
折起,使二面角
等于
,则四面体
外接球的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6060d9a82ed5405a1ea8cd824448b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2898853a3396f0878af9eac934416d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2020-02-21更新
|
1080次组卷
|
4卷引用:2020届吉林省长春市东北师大附中等六校高三联合模拟数学理科试题
9 . 已知三棱柱
的侧棱与底面边长都相等,
在底面
上的射影为
的中点,则异面直线
与
所成的角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
您最近一年使用:0次
10 . 《周髀算经》中记录了一种“盖天天地模型”如图所示,“天之中央亦高四旁六万里.四旁犹四极也,地穹隆而高,如盖笠.故日光外所照径八十一万里,周二百四十三万里.”意思为“天的中央亦高出四周六万里,四旁就是四极,随地穹隆而天也高凸,如盖笠.所以日光向外照射的最大直径是八十一万里,周长是二百四十三万里.”将地球看成球体,以此数据可估算地球半径大约为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/b1d45be0-fedf-48fa-b31c-f9b175da0caf.png?resizew=269)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/b1d45be0-fedf-48fa-b31c-f9b175da0caf.png?resizew=269)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-02-15更新
|
1550次组卷
|
4卷引用:2020届安徽省芜湖市高三上学期期末数学(理)试题
2020届安徽省芜湖市高三上学期期末数学(理)试题2020届高三1月(考点07)(理科)-《新题速递·数学》(已下线)2020年新高考全国2卷数学高考真题变式题1-5题江西省上饶市重点高中2022-2023学年高二上学期开学考试数学试题