设
是定义在
上的函数,且
,对任意
,
,若经过点
、
的直线与
轴的交点是
,则称
为
、
关于函数
的平均数,记为
.
(1)若
,求
的表达式;
(2)若
,求出所有满足条件的
的解析式;
(3)若对任意
,
,且
,都有
成立,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fed3c00731e2b8cb28168839363e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb16534dcb01977caa20f738f43158a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7615495e833d173a8845b19405ba3a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c248c15da679e72278636cb731b7230a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c0668061426d6a0e63006d263c7815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c248c15da679e72278636cb731b7230a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4028849df8ded22fa2a5c2aead15a9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79657921c225d5a6a7d124ebfdf11d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af175d95e0acabd3cbd027b7192aee5d.png)
20-21高三上·上海徐汇·期中 查看更多[2]
更新时间:2020-12-02 11:21:26
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相似题推荐
解答题-问答题
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【推荐1】已知椭圆
的焦距为4,其左、右顶点为
,点
为其上一动点,且
的面积最大值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/daa0ba6e-7db4-4969-833e-2f00db133ec9.png?resizew=166)
(1)求椭圆
的标准方程;
(2)如图,若
为曲线
上异于
的两点,直线
不过坐标原点
,且不与坐标轴平行.点
关于原点
的对称点为
,若直线
与直线
相交于点
,是否存在直线
与直线
平行?若存在,求出直线
的方程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb896431d786abdd2f47329ec1f257f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d52429c8324350309f77e7209a5c35.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/daa0ba6e-7db4-4969-833e-2f00db133ec9.png?resizew=166)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e203b7c9a6600e0272c58a23733490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f896fadb8e4d4dcd7a96bf35948f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0276df41cac9dd65cdb868dad13d17e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b06b75fb4e379ff3b99e68f40136cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,在平面直角坐标系中,
分别为双曲线Г:
的左、右焦点,点D为线段
的中点,直线MN过点
且与双曲线右支交于
两点,延长MD、ND,分别与双曲线Г交于P、Q两点.
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873675367243776/2876742357467136/STEM/358abcbb-a95a-4f0c-b8e8-023529854af5.png?resizew=211)
(1)已知点
,求点D到直线MN的距离;
(2)求证:
;
(3)若直线MN、PQ的斜率都存在,且依次设为k1、k2.试判断
是否为定值,如果是,请求出
的值;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5848e50805496263d52dcbde9671a89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438b087a3b66f48298b5a944629adb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7d5b7a335fb30a034976287aee9e05.png)
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873675367243776/2876742357467136/STEM/358abcbb-a95a-4f0c-b8e8-023529854af5.png?resizew=211)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5261c3908257dfc70e84ae8126163e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eab0357b5e80a6fa5b1c51a2f01be14.png)
(3)若直线MN、PQ的斜率都存在,且依次设为k1、k2.试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a3f348a942d468f0d77c0dfbb41d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a3f348a942d468f0d77c0dfbb41d87.png)
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【推荐1】函数
的最小值为m.
(1)判断m与2的大小,并说明理由;
(2)求函数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42cd5920c27db7257886fece226833b.png)
(1)判断m与2的大小,并说明理由;
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b46177f5971c89d02dd1be6db526ca.png)
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【推荐2】 设函数![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/0a18c7416a0d40d5a7233aef5a4076b8.png)
(1)若
且对任意实数
均有
成立,求实数
的值;
(2)在(1)的条件下,令
,若
与
在
上有相同的单调性,
且
,试比较
与
的大小
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/0a18c7416a0d40d5a7233aef5a4076b8.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/5db84c0f0f1a4be58d7eb4ac5835e933.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/cc39c171521b4140ae4a9c3240cb5aa2.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/e304f3f96c7046838b494ab97adc9a13.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/ff5ae89eda624129ba2d438dab15984d.png)
(2)在(1)的条件下,令
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/fbf34dfa42294bc2ad88a74d1988e40e.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/e5e8a64238e140ed9f9cd754e722b44d.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/de8f4da9023841b6aa3c777f47ce0e6e.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/f005aa5232804cb2aeb4de3262751cc0.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/3eb1d9bb62084b5e993c3c47436f05a8.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/1fa54706e27b4361903ecd38dca81e41.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/adbe8baca34f4bb09cd1fac68cba4d2a.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303527424/STEM/45b318ba609742efb4f617cc7abbf52f.png)
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【推荐3】已知函数
,其中e是自然对数的底数.
(1)若关于x的不等式
在
上恒成立,求实数m的取值范围;
(2)已知正数a满足:
,试比较
与
的大小,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c79728eda595218be2154adf12590b.png)
(1)若关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea897547a3c134c8d39e8ab3173ba76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8938db94f49dcbe0c383fba0241bb0da.png)
(2)已知正数a满足:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac10f3518a6b80e4dfd43e5dd5620fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b52fba05677343daa1d9e8cffc40d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df45bf44f25112b0ef26da665f194ef5.png)
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【推荐1】设函数的定义域为
,如果存在
,使得
在
上的值域也为
,则称
为“A佳”函数.已知幂函数
在
上是单调增函数.
(1)求函数
的解析式:
(2)
是否为“A佳”函数.若是,请指出所在区间;若不是,请说明理由.
(3)若函数
,且
是“A佳”函数,试求出实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c530f1e0add9889129f5d056db6b649c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4776c85b79df196f606d3ebf3697fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4776c85b79df196f606d3ebf3697fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a691502fd1f0c3e14bd0fe706c598644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d739ee4b3dc7579fa66382aff7bebe6c.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63343ce33a56b418f1f96b6c63d9a6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】已知O为坐标原点,对于函数
,称向量
为函数
的伴随向量,同时称函数
为向量
的伴随函数.
(1)设函数
,试求
的伴随向量
;
(2)记向量
的伴随函数为
,求当
且
时
的值;
(3)由(1)中函数
的图象(纵坐标不变)横坐标伸长为原来的2倍,再把整个图象向右平移
个单位长度得到
的图象,已知
,
,问在
的图象上是否存在一点P,使得
.若存在,求出P点坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc54bc56c16baa3643686b85a6130e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d537c572424ac879e03ce10dab71020f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6799b234237333b0efa331d98f0374.png)
(1)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67802205ffdf7f2e88025dc359605c4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6799b234237333b0efa331d98f0374.png)
(2)记向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5303f8976b3b7cee5964b5cdfa09c5ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6197fc9360bc260883f303f344dce62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cd4ed7c9a6171d1a032c02f8d6101f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66db91bb3be9e2b6ad567774e3699758.png)
(3)由(1)中函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0211da37e92f915e781691296578ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d433b68a1bd2bb57825df3bafb6f9f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bacdf696e773212e9d1aeba886f2573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b354aefbabbc26c70388d76919dad557.png)
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