解题方法
1 . 已知椭圆
的长轴长为4,A,B是其左、右顶点,M是椭圆上异于A,B的动点,且
.
(1)求椭圆C的方程;
(2)若P为直线
上一点,PA,PB分别与椭圆交于C,D两点.
①证明:直线CD过椭圆右焦点
;
②椭圆的左焦点为
,求
的周长是否为定值,若是,求出该定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e870d323a62a728a87efd0d58a6604.png)
(1)求椭圆C的方程;
(2)若P为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
①证明:直线CD过椭圆右焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
②椭圆的左焦点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe9ac6c866f9b2fd2eca32a5da2c298.png)
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2023-04-16更新
|
900次组卷
|
6卷引用:甘肃省2023届高三二模文科数学试题
甘肃省2023届高三二模文科数学试题甘肃省武威市凉州区2023届高三下学期第四次诊断考试数学(文)试题甘肃省2023届高三第二次诊断文科数学试题(已下线)数学(全国甲卷文科)(已下线)专题15解析几何(解答题)四川省成都市简阳市阳安中学2023届高三模拟训练(一)数学(文科)试题
名校
2 . 如图,在四棱锥
中,底面
为矩形,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/9630101e-3637-435f-b65a-1de14a518f01.png?resizew=208)
(1)证明:
平面
;
(2)若
,
,且
,
,求二面角
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/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9396a2523d078c7fafbdcf231a9e772d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/9630101e-3637-435f-b65a-1de14a518f01.png?resizew=208)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f8759991daa986ef2e729fb6170ccf.png)
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2023-05-20更新
|
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|
3卷引用:甘肃省金昌市2023届高三二模数学(理)试题
甘肃省金昌市2023届高三二模数学(理)试题陕西省西安市铁一中学2023-2024学年高三上学期第二次月考理科数学试题(已下线)陕西省西安市铁一中学2023-2024学年高三上学期第二次月考理科数学试题变式题19-22
名校
解题方法
3 . 如图,在四棱锥
中,
底面
,底面
是矩形,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/655e8c62-2ec0-469f-8277-19bb2945eaff.png?resizew=154)
(1)证明:
.
(2)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/5a1b49f64e0065edad868b25e9fcada3.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/466deee706eb335b7d05b35bfc9319b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/655e8c62-2ec0-469f-8277-19bb2945eaff.png?resizew=154)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186e5e7efe51fd25b9e38dc0fa23de9d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1269599d8f29c769773c8288e91b831.png)
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2023-03-24更新
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1011次组卷
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4卷引用:甘肃省兰州市第五十八中学2022-2023学年高三下学期第二次模拟考试数学(理科)试卷
名校
解题方法
4 . 已知椭圆
的焦距为
,且经过点
,
(1)求椭圆
的标准方程;
(2)设
为坐标原点,在椭圆短轴上有两点
(
不与短轴端点重合)满足
,直线
分别交椭圆于
两点,求证:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee9d4ad39e56940f519bd3acc5e85ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d055bf00b8e6641c46db27ffe05113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3178e2296170fb2ba5ed2c016a1edc80.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085e555d195462b1a45f2bbf79835da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec8858389f4c3156a946ba8bf0d8a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2022-11-19更新
|
813次组卷
|
4卷引用:甘肃省酒泉市敦煌中学2022-2023学年高三第二次诊断考试数学(文科)试题
甘肃省酒泉市敦煌中学2022-2023学年高三第二次诊断考试数学(文科)试题江苏省盐城市响水中学2022-2023学年高二上学期期中数学试题(已下线)专题9-5 圆锥曲线大题基础:定点归类(已下线)专题04 圆锥曲线经典题型全归纳(2)
5 . 已知
是椭圆
的左、右焦点,
是椭圆的短轴,菱形
的周长为
,面积为
,椭圆
的焦距大于短轴长.
(1)求椭圆
的方程;
(2)若
是椭圆
内的一点(不在
的轴上),过点
作直线交
于
两点,且点
为
的中点,椭圆
的离心率为
,点
也在
上,求证:直线
与
相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a200ca2c4af794f4d1c6a5443830b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc9076974ebd6331d67055302be8167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e694ed4fd4d76f641a4212908c0aa55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74e933de1a9cf13a487687c8b33187a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
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|
355次组卷
|
3卷引用:甘肃省兰州市2023届高三下学期诊断考试文科数学试题
6 . 如图甲所示的正方形
中,
,
,
,对角线
分别交
,
于点
,
,将正方形
沿
,
折叠使得
与
重合,构成如图乙所示的三棱柱
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/295ec9ad-baae-4ff4-9aeb-f906dc167109.png?resizew=315)
(1)若点
在棱
上,且
,证明:
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c27162b93f88ff58afc18e06db4f80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eaba7d7d6f2f3d6d4a2fe85d3c427f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c237384c7ab460efcba2881b3b2d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf32cea2153f11f772f53be7df8eea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f422723c3267cad031751b9413cc6c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.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/7c27162b93f88ff58afc18e06db4f80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef67f23370e418c1e920699cacd6f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/295ec9ad-baae-4ff4-9aeb-f906dc167109.png?resizew=315)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4f1fcdce96fea5c891d85bffa2a625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982d01f052709b72afeaf1015fc7acc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1de7da3ab92e70f135ea628a691167.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1de7da3ab92e70f135ea628a691167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1253885737cd104e24ddd2d4c96e4c86.png)
您最近一年使用:0次
2023-03-30更新
|
439次组卷
|
4卷引用:甘肃省2023届高三第一次高考诊断理科数学试题
甘肃省2023届高三第一次高考诊断理科数学试题新疆新和县实验中学2023届高三素养调研第一次模拟考试数学(理)试题新疆柯坪县柯坪湖州国庆中学2022-2023学年高二下学期5月期中考试数学试题(已下线)重难点突破06 立体几何解答题最全归纳总结(九大题型)-1
名校
7 . 如图,在三棱锥
中,侧面
底面
是边长为2的正三角形,
分别是
的中点,记平面
与平面
的交线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/9196bbb7-4b57-4cfa-8804-1e47e32fa33e.png?resizew=159)
(1)证明:直线
平面
.
(2)若
在直线
上且
为锐角,当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15521dd7c40e9cdd079b8cbbef40c691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adc0d8ca04f347b38d505ea245d54dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829a1a887ceba13dd8551b1e3604bf6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/9196bbb7-4b57-4cfa-8804-1e47e32fa33e.png?resizew=159)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](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/fca0db96ed36d4b7aa1e9841c30c0e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6b5e5fdc9ee75ed14e6f1c4cc4d9b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3414816d67cfac6ab7312f44eec70cbf.png)
您最近一年使用:0次
2023-03-26更新
|
2078次组卷
|
7卷引用:甘肃省张掖市2023届高三下学期4月联考数学(理)试题
名校
解题方法
8 . 如图所示的五边形
中
是矩形,
,
,沿
折叠成四棱锥
,点
是
的中点,
.
中,可以满足条件①
;②
;③
,请从中任选两个作为补充条件,证明:侧面
底面
;(注:若选择不同的组合分别解答,则按第一个解答计分.)
(2)在(1)的条件下求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6718857e3473b4dbe7c14b2a24612ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4cab41e3c3e1b04f0cff21aca315238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.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/d6735fcb2c31905447b45697c55a1a16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8300bca7b13f8487061c5d6d2e82802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4f62d0920718d32974ccc06b1bf6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f9f450a27660b0996a5f8003c47f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在(1)的条件下求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
您最近一年使用:0次
2023-03-24更新
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249次组卷
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2卷引用:甘肃省兰州市2023届高三下学期诊断考试理科数学试题
名校
解题方法
9 . 如图,在四棱锥
中,底面
是矩形,
是
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/75a493f4-6ef6-4ec5-9d9f-3a64204c759a.png?resizew=169)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7898f562dffdf08263bfb0873e0691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03bb46e45e9c26b15d53a5dc53185aca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/75a493f4-6ef6-4ec5-9d9f-3a64204c759a.png?resizew=169)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2022-11-27更新
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1513次组卷
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7卷引用:甘肃省张掖市某重点校2022-2023学年高三上学期第三次模拟考试数学(理)试题
10 . 在直角梯形
(如图1),
,
,AD=8,AB=BC=4,M为线段AD中点.将△ABC沿AC折起,使平面ABC⊥平面ACD,得到几何体B-ACD(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/55a3ed2d-b40a-462d-a573-7243eab26dc9.png?resizew=332)
(1)求证:CD⊥平面ABC;
(2)求AB与平面BCM所成角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/55a3ed2d-b40a-462d-a573-7243eab26dc9.png?resizew=332)
(1)求证:CD⊥平面ABC;
(2)求AB与平面BCM所成角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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2023-01-16更新
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513次组卷
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3卷引用:甘肃省兰州市第五十八中学2022-2023学年高三上学期第一次模拟考试数学(理科)试题