1 . 请阅读下列材料:若两个正实数
,
,满足
,求证:
.
证明:构造函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b23c9166bb905415c1268005f6d6f8.png)
,因为对一切实数
,恒有
,所以
,即
,所以
.
根据上述证明方法,若
个正实数
,
,
,
,满足
,你能得到的结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4008e47c0a1cbdf408aee7aa3b146786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a29e9984ad7ac338129d8672a5b3d1.png)
证明:构造函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b23c9166bb905415c1268005f6d6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc174079c25a8631cc86c35bf48dcd62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babc2bdb59e9ae1821bd48e7395474d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247b3879c34962c1b9aa2421a47a6004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17189d13389ae711457906ceb3658baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a29e9984ad7ac338129d8672a5b3d1.png)
根据上述证明方法,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e45ab9253fef6c71bfc5f6c9b116b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23563a7fd23559de3008713ab5dd47a.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2021-03-25更新
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3卷引用:河南省新乡名校2020-2021学年下学期期末联考高二数学(文)试题
2 . (1)求证
.
(2)设x,y都是正数,且x+y>2证明:
和
中至少有一个成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ffe492bb9af2b14bac592bbc72cd3d.png)
(2)设x,y都是正数,且x+y>2证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe6efd706e0d6fd5921c8ba41866c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994a46413196d5150c865507aea411ae.png)
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2019-06-25更新
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9卷引用:河南省新乡市辉县市第二高级中学2019-2020学年高二下学期期中考试数学(理)试题
河南省新乡市辉县市第二高级中学2019-2020学年高二下学期期中考试数学(理)试题河南省新乡市辉县市第二高级中学2019-2020学年高二下学期期中考试数学(文)试题河南省新乡市河南师大附中实验学校2021-2022学年高二下学期期中考试数学文科试题【全国百强校】宁夏回族自治区平罗中学2018-2019学年高二下学期期中考试数学(文)试题河南省周口市郸城县实验高中2019-2020学年高二下学期第二次月考数学(理)试题安徽省安庆市第十中学2020-2021学年高二下学期第一次月考文科数学试题安徽省芜湖市第一中学2020-2021学年高二下学期期中理科数学试题山西省晋中市新一双语学校2020-2021学年高二下学期3月月考数学(理)试题2019届陕西省宝鸡市宝鸡中学高三上学期10月第一次模拟考试数学(文)试题(A卷)
3 . 用综合法或分析法证明:
(1)如果
,那么
;
(2)设
,求证:
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd70f831f301205134280f6432c8f84d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a9344f4fca7b9779ca7720e5277ea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5db954c420a02fb75045066e61fca15.png)
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2卷引用:河南省新乡市辉县市一中2020-2021学年高二(培优班)下学期第一次阶段性考试数学理试题
解题方法
4 . 已知椭圆
的右焦点为
,短轴长为2.
(1)求
的方程.
(2)若
为
上的两个动点,
两点的纵坐标的乘积大于
,且
.证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7b07ace87ed58fdc1f1bc78a04aeda.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8aade8ee1e2e568e1bfd7bdcdf9060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4f96905656ca8f1849ab44f804e5ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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3卷引用:河南省新乡市2023-2024学年高二上学期期中数学试题
5 . 在斜三棱柱
中,
是等腰直角三角形,
,
,平面
底面
,
.
(1)证明:
;
(2)求平面
与平面
夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e1f102b442ed4821c2f06b872dd296.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/2d1f38a0-c787-4698-be8a-966364fc0734.png?resizew=180)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19c98253667b5b010c4ef438b431121.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f664c0db517bec6886ff0b6100fd474.png)
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7卷引用:河南省新乡市铁路高级中学2023-2024学年高二上学期第一次月考数学试题
河南省新乡市铁路高级中学2023-2024学年高二上学期第一次月考数学试题山东省菏泽市第三中学2022-2023学年高二上学期12月月考数学试题(已下线)第12讲 第一章 空间向量与立体几何 章节验收测评卷(基础卷)-【帮课堂】2023-2024学年高二数学同步学与练(人教A版2019选择性必修第一册)(已下线)1.2.4 二面角(分层训练)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第一册)河北省2023届高三上学期省级联测数学试题(已下线)江西省上饶市2023届高三第一次高考模拟考试数学(理)试题变式题16-20山东省诸城第一中学2023-2024学年高三上学期10月月考数学试题
6 . 在数列
中,已知
.
(1)证明数列
是等比数列,并求
的通项公式;
(2)设
,若数列
与
的公共项为
,记
由小到大构成数列
,求
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad97f95de9ea454a79f73e7b1657f25c.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d363b6982fee3bf1337d1542137a2f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ff259bff098430a6512d0e4f6fb2d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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名校
7 . 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
解题方法
8 . 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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解题方法
9 . 如图,在正三棱柱
中,
是
的中点,
.
(1)证明:
.
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4639a9dc0bc99101cbde59fef04b4a2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/f70e0ef7-cf92-4def-9124-bd624f4dbd6d.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a8670759c61d785b9a336885df700b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53dd937a69497a6743a3119fbce8f07a.png)
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5卷引用:河南省新乡市2023-2024学年高二上学期期中数学试题
名校
解题方法
10 . 如图,在所有棱长均为1的平行六面体
中,
,侧棱
与
,
均成
角,
为侧面
的中心.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/058f65d3-b87a-436d-b4c1-bdb2846ed7b7.png?resizew=184)
(1)若N为
的中点,证明:
,B,D,N四点共面.
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/058f65d3-b87a-436d-b4c1-bdb2846ed7b7.png?resizew=184)
(1)若N为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
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4卷引用:河南省新乡市2023-2024学年高二上学期期中数学试题