解题方法
1 . 如图,在三棱锥
中,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/d998eb7a-11df-4d13-b0df-2154f602b580.png?resizew=148)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](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/680bd341c5bc48c24b0d520f66de6512.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/d998eb7a-11df-4d13-b0df-2154f602b580.png?resizew=148)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
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2 . 如图所示,在空间四边形
中,点
在线段
上,且
为线段
的中点,
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/a4e49bd0-8817-4fb4-9ba6-4ca6e9155cbf.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.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/227574a4ec830a726661a810f3790d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9dda0dd9f20ab49de6bd5cf6297f9f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/a4e49bd0-8817-4fb4-9ba6-4ca6e9155cbf.png?resizew=153)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3 . 已知
为平面
的一个法向量,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
,则下列向量是平面
的一个法向量的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0febcd248a676e71458c5749d2f650f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-02-06更新
|
142次组卷
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2卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
解题方法
4 . 如图,椭圆
的左、右焦点分别为
为椭圆
上一点,
为
轴上一点,
在以
为直径的圆上,且
,则椭圆
的离心率为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/ba46829f-b6cb-4f5f-ada4-c0d91314203b.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e817f2edc8652709675519d41a1803a.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/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8072d7ab765cab796617fb83a9dd8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/ba46829f-b6cb-4f5f-ada4-c0d91314203b.png?resizew=163)
A.![]() | B.![]() | C.![]() | D.![]() |
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|
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2卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
名校
解题方法
5 . 在直三棱柱
中,若
,则
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9660c3c8418332f34c4676002303b0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-01-26更新
|
137次组卷
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2卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
解题方法
6 . 如图,三棱锥
中,
,
为等边三角形,
为
上的一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/f1a7675a-51e2-410c-b08d-2cd007ce11df.png?resizew=145)
(1)证明:平面
平面
;
(2)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/98d1dcf629b8e79431420348ab9af345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/f1a7675a-51e2-410c-b08d-2cd007ce11df.png?resizew=145)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c793e088af57bb0ff89012f940f2a29f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f96627abd793ca157d4dd1587f584d.png)
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2024-01-26更新
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3卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
解题方法
7 . 已知双曲线
的一条渐近线方程为
,则
的焦距为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e063a9ed1dc644d2fb3065e5685e567.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b299a4de48b7cbf17f63d71fbd06d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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3卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
8 . 已知
为正方体
所在空间内一点,且
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98616ec6a351762039ee41df50060231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
A.![]() |
B.三棱锥![]() |
C.存在唯一的![]() ![]() ![]() |
D.存在唯一的![]() ![]() |
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148次组卷
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4卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
名校
9 . 已知椭圆
与双曲线
的焦距之比为
.
(1)求椭圆
和双曲线
的离心率;
(2)设双曲线
的右焦点为F,过F作
轴交双曲线
于点P(P在第一象限),A,B分别为椭圆
的左、右顶点,
与椭圆
交于另一点Q,O为坐标原点,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd486b8796b3454eab219c28ed131683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e8ecb41c1e7e0cea771f75ccf1b6de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)设双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb7c47e3b286437d8e6ee8b7ec4f003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932b5ed149ea885cfd5353ff2e6ceac2.png)
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8卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题
10 . 已知抛物线
的焦点为F,过点F作互相垂直的两条直线与抛物线E分别交于点A,B,C,D,P,Q分别为
,
的中点,O为坐标原点,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4fb72e39d79b7a0cd892fa5fa34bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.![]() |
B.![]() |
C.若F恰好为![]() ![]() ![]() |
D.直线![]() ![]() |
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4卷引用:河南省新乡市2023-2024学年高二上学期1月期末测试数学试题