名校
解题方法
1 . 古希腊哲学家发现并证明了只存在5种正多面体,即正四面体、正六面体、正八面体、正十二面体、正二十面体,其中正八面体是由8个等边三角形构成.正八面体在计算机科学中用于三维模型和场景的构建,以及人工智能领域中用于图象识别和处理,另外在晶体和材料科学中也被广泛应用.现有一个棱长为2的正八面体
,如图所示,下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cbd9eb22f75ad5304d8491b314a9a9.png)
A.若点![]() ![]() |
B.若该正八面体的12条棱中点在同一个球的球面上,则该球的表面积为![]() |
C.该正八面体内任意一点到8个侧面的距离之和为定值 |
D.已知正方体![]() ![]() |
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2024-06-11更新
|
351次组卷
|
2卷引用:河北省沧州市沧县中学2023-2024学年高三下学期模拟预测数学试题
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2 . 已知函数
(
为常数),则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3b8f26d1ccb93973ae89e1d6be3bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.当![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() |
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2024-06-08更新
|
669次组卷
|
3卷引用:河北省沧州市盐山中学2024届高三三模数学试题
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解题方法
3 . 若不等式
,
对于
恒成立,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9e1cf5f2c19dafae6d2ec13cb31e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7b5582e1931243dbb90b7591137f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13502d46b8563c54c09b29b20b3006a4.png)
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解题方法
4 . 已知椭圆
的上顶点、左顶点为
为椭圆
上异于点
的两个不同点,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4402aeb853b22f20992156957ef0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376c5c180b743c655f2af84b11ac9a4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
A.若直线![]() ![]() ![]() ![]() |
B.若直线![]() ![]() ![]() ![]() |
C.若直线![]() ![]() ![]() ![]() |
D.若直线![]() ![]() ![]() ![]() |
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解题方法
5 . 如图,在直三棱柱
中,△
为边长为2的正三角形,
为
中点,点
在棱
上,且
.
时,求证
平面
;
(2)设
为底面
的中心,求直线
与平面
所成角的正弦值的最大值,并求取得最大值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645b45818c7a7c68a772a30262277c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a1794201d5a18fe46cfb6901c7f0d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441809d6ce2df21a85b390cdce9b1112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4525c00ed908bed8ba8d353e747a858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c4c2157cf374ebe6352715ef100471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2024-06-04更新
|
664次组卷
|
2卷引用:河北省沧州市联考2023-2024学年高三下学期4月月考数学试题
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解题方法
6 . 已知圆
,圆
.若动圆S与圆
、圆
都内切,记动圆S的圆心的轨迹为C.
(1)求轨迹C的方程;
(2)已知
,过点
的直线l与C交于P,Q两点,直线AP,AQ分别交直线
于M,N,设线段MN的中点为G,判断点G是否在轨迹C上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e283d433aa1a50f03b43bb55e26655d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e49fe5cc64a55c59be7ca14a4b8860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(1)求轨迹C的方程;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02af485e17e7628fd5a3ace6e0a32ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
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解题方法
7 . 在长方体
中,
,
,点
为
的中点,点
为四边形
内一点,且
,则直线
与平面
所成角的正切值的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6e349d06e669d2e02ecbc69f6bb9cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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8 . 已知函数
的定义域为
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7a58ff63808a1c886f382d47b9f5fd.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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解题方法
9 . 已知函数
.
(1)求
的值域;
(2)求证:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d85891847e4fce1951f0eb6a5c696c5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c768e5a8a2c72590a83fb7f0b2f10475.png)
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10 . 已知抛物线
的焦点为F,动直线l与抛物线C交于A,B两点,分别过A,B向直线
引垂线,垂足分别为
,
,点M在
上,且MA
MB,设O为坐标原点,则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28062ef6b7d6fa9e539d0f0b7571b51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34517f479fb08f6096d2fb0362f3ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
A.M为线段![]() | B.![]() ![]() ![]() |
C.A,O,![]() | D.MA与抛物线C有两个公共点 |
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