名校
1 . 已知椭圆
:
的离心率为
,以原点为圆心,椭圆的短半轴长为半径的圆与直线
相切.
(1)求椭圆
的方程;
(2)设
,过点
作与
轴不重合的直线
交椭圆
于
,
两点,连接
,
分别交直线
于
,
两点,若直线
、
的斜率分别为
、
,试问:
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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ec56b59d6f2654570c2b5c4fd13a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6cf8bcdb0a70eec31e80f0f1786f1f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424b20ba1d80badd5ced823b4484fca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47948b0c2daed4873697b2b1708ddbab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56cf3dde63baa5caf878c7ff8d31f648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36d874d5d8db342ad523c33d13b15e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f179ccebf08df42f72bf004e0aca2ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
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13卷引用:湖北省武汉襄阳荆门宜昌四地六校考试联盟2020-2021学年高三上学期起点联考数学试题
湖北省武汉襄阳荆门宜昌四地六校考试联盟2020-2021学年高三上学期起点联考数学试题湖北省华中师大一附中等六校2020-2021学年高三上学期联考数学试题2016届重庆市巴蜀中学高三上学期第三次月考理科数学试卷2016届安徽省六安一中高三下学期综合训练一理科数学试卷2016届黑龙江哈尔滨六中高三下四模考试文科数学试卷2019年四川省仁寿一中等西南四省八校高三9月份联考数学(文)试题四川省仁寿一中等西南四省八校2020届高三9月份联考数学(理)试题重庆市江津中学、实验中学等七校2020届高三下学期6月联考(三诊)数学(文)试题广东省深圳市菁华学校2020-2021学年高二上学期12月月考数学试题江苏省盐城市阜宁中学2021-2022学年高二上学期第一次阶段检测数学试题(已下线)第64讲 章末检测九(已下线)专题32 一类与斜率和、差、商、积问题的探究-2海南省文昌市文昌中学、华迈实验中学2023-2024学年高二上学期期中段考数学试题
2 . 已知函数
,
.
(1)记
,证明
在区间
内有且仅有唯一实根;
(2)记
在
内的实根为
,
,若
在
有两不等实根
,判断
与
的大小,并给出对应的证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3b6c56aee4bb8a8131fd960415c745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663962b492c8afb35cb95ed707f7dad9.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3c2be7482719651bcf491949681e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad597ba4472ab8c270a897f85c6c04b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e22b6439923451e6de0dde5ed0b7a66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e1c9c97de9198d47306216e9961b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dae74c724114bfeff024dd7b79f5edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450398974b1561ca801e102e16df6789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77397fbf8224ec0ae05cdf385839f70c.png)
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3 . 对于n∈N*,将n表示为n=a0×2k+a1×2k﹣1+a2×2k﹣2+…+ak﹣1×21+ak×20,i=0时,ai=1,当1≤i≤k时,ai为0或1,记I(n)为上述表示中ai为0的个数;例如4=1×22+0×21+0×20,11=1×23+0×22+1×21+1×20,故I(4)=2,I(11)=1;则2I(1)+2I(2)+…+2I(254)+2I(255)=_____ .
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2016-12-04更新
|
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4卷引用:湖北省部分名校2023届高考适应性考试数学试题
湖北省部分名校2023届高考适应性考试数学试题2016届上海市建平中学高三上12月月考理科数学试卷(已下线)模块07 数列与数学归纳法-2022年高考数学一轮复习小题多维练(上海专用)(已下线)数列的综合应用
4 . 数列
的首项为
,前n项和为
,且
,设
,cn=k+b1+b2+…+bn(k∈R+).
(1)求数列{an}的通项公式;
(2)当t=1时,若对任意n∈N*,|bn|≥|b3|恒成立,求a的取值范围;
(3)当t≠1时,试求三个正数a,t,k的一组值,使得{cn}为等比数列,且a,t,k成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b7a6d09380e341f05dac8b4a813e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3a56c5026d4137c5c9eb05121f75cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e512a17da44f16cdc07bf7a50ab4c831.png)
(1)求数列{an}的通项公式;
(2)当t=1时,若对任意n∈N*,|bn|≥|b3|恒成立,求a的取值范围;
(3)当t≠1时,试求三个正数a,t,k的一组值,使得{cn}为等比数列,且a,t,k成等差数列.
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5 . 已知椭圆C的方程为
,定点N(0,1),过圆M:
上任意一点作圆M的一条切线交椭圆
于
、
两点.
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/33f46982efb140f78091fff89b56e629.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/2e97d429837b4ac39a2a481e676989ec.png)
(1)求证:
;
(2)求
的取值范围;
(3)若点P、Q在椭圆C上,直线PQ与x轴平行,直线PN交椭圆于另一个不同的点S,问:直线QS是否经过一个定点?若是,求出这个定点的坐标;若不是,说明理由.
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/8f3b5117b9214415bde051e7de74d35c.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/7fcccc1f066c43f0a9d84aba428e84f4.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/e1110baf0ea54b0081338a56781c5ed2.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/8296bf5052ea452d87e0fb667437d315.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/7f6395e630174e65990549f0efa94e8d.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/33f46982efb140f78091fff89b56e629.png)
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/2e97d429837b4ac39a2a481e676989ec.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/6c8d7a91ce3643a2a173a353798ec9d1.png)
(2)求
![](https://img.xkw.com/dksih/QBM/2015/11/25/1572309603401728/1572309609553920/STEM/6c1bd758242f418d8b1fa8983e3102f5.png)
(3)若点P、Q在椭圆C上,直线PQ与x轴平行,直线PN交椭圆于另一个不同的点S,问:直线QS是否经过一个定点?若是,求出这个定点的坐标;若不是,说明理由.
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6 . 已知函数
(
).
(1)求函数
的单调区间;
(2)函数
在定义域内存在零点, 求
的取值范围.
(3)若
,当
时,不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8a1158dc0bd7fe9811e7f7d8865bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da989240786ef7c3e2d903f30caf59e3.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38bb7c66bb0c7e288174a26a33169d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b4af9ac84216fb953fee4808dfd225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db2eb29042782efa4f96d82e6aa35d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f143edc0b40541882ee735574c35181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2016-12-03更新
|
1447次组卷
|
3卷引用:2017届湖北襄阳四中高三七月周考三数学(文)试卷
7 . 已知函数
,其中
.
(Ⅰ)讨论
的单调性;
(Ⅱ)设曲线
与
轴正半轴的交点为P,曲线在点P处的切线方程为
,求证:对于任意的正实数
,都有
;
(Ⅲ)若关于
的方程
有两个正实根
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9df5d10a6f1f8d08333d5ba359317e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9678d9630c4df952ce3be68db0a2ac.png)
(Ⅰ)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(Ⅱ)设曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2dbdf443e1f562404128d004df83992.png)
(Ⅲ)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b42ef7280c8b898aac50cb64aba24f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeeb4e1a1eeeea683c3a780164ba09fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21377ae7c880facfeadae2d9f53007e.png)
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|
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14卷引用:2020届湖北省武汉中学高三下学期第二次教学质量检测理科数学试题
2020届湖北省武汉中学高三下学期第二次教学质量检测理科数学试题2015年全国普通高等学校招生统一考试理科数学(天津卷)2015-2016学年重庆市一中高二4月月考理科数学试卷2015-2016学年河北武邑中学高二下4.24周考理数学卷河北省衡水中学2022届高三上学期五调数学试题(已下线)第12讲 双变量不等式:剪刀模型-突破2022年新高考数学导数压轴解答题精选精练(已下线)第29讲 割线法证明零点差大于某值,切线法证明零点差小于某值-突破2022年新高考数学导数压轴解答题精选精练(已下线)第13讲 双变量问题-2022年新高考数学二轮专题突破精练(已下线)专题3-7 导数压轴大题归类:不等式证明归类(2)-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)(已下线)第02讲 一元函数的导数及其应用(二)(练)广东省深圳市福田区红岭中学2023届高三上学期第二次统一考数学试题湖南省张家界市慈利县第一中学2022-2023学年高三上学期第四次月考数学试题(已下线)专题22 导数解答题(理科)-2专题13导数及其应用(第二部分)
真题
8 . 已知数列
的各项均为正数,
,
为自然对数的底数.
(Ⅰ)求函数
的单调区间,并比较
与
的大小;
(Ⅱ)计算
,
,
,由此推测计算
的公式,并给出证明;
(Ⅲ)令
,数列
,
的前
项和分别记为
,
, 证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c73e3f1f5c7b7ff2f59d9c22f436200.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046600704/STEM/7bb4a6b2614143e687465abe961d2098.png)
(Ⅰ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7856da98d03a82c6e6f73b97ecaad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753daa25630fa6e903e252f3f84bcb91.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046600704/STEM/7bb4a6b2614143e687465abe961d2098.png)
(Ⅱ)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42d92e582d2401ed0c8e69faea6d97f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1779f08ea146dfc266375d42b0555a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/809ddc61ffc79ff7fb54e3adf406678d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d39e50faa6fa0f927496cdd613ad0f7.png)
(Ⅲ)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ebe482242d456a006b0db816e2a25b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c522c1c881528ab6f9708f6bdd4c4db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046600704/STEM/31e0dadd5fb141f2b905e7e29bc9a75a.png)
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9卷引用:2015年全国普通高等学校招生统一考试理科数学(湖北卷)
2015年全国普通高等学校招生统一考试理科数学(湖北卷)(已下线)专题6.6 数学归纳法 (练)-浙江版《2020年高考一轮复习讲练测》(已下线)专题12.3 数学归纳法及其应用(练)【理】-《2020年高考一轮复习讲练测》(已下线)专题33 算法、复数、推理与证明-十年(2011-2020)高考真题数学分项(八)(已下线)专题7.6 数学归纳法(练)-2021年新高考数学一轮复习讲练测(已下线)专题7.6 数学归纳法(练)- 2022年高考数学一轮复习讲练测(新教材新高考)(已下线)第二篇 函数与导数专题1 重要极限(逼近、放缩)(已下线)专题22 导数解答题(理科)-3专题35导数及其应用解答题(第二部分)
9 . 一种作图工具如图1所示.
是滑槽
的中点,短杆
可绕
转动,长杆
通过
处铰链与
连接,
上的栓子
可沿滑槽AB滑动,且
,
.当栓子
在滑槽AB内做往复运动时,带动
绕
转动一周(
不动时,
也不动),
处的笔尖画出的曲线记为
.以
为原点,
所在的直线为
轴建立如图2所示的平面直角坐标系.
(Ⅰ)求曲线C的方程;
(Ⅱ)设动直线
与两定直线
和
分别交于
两点.若直线
总与曲线
有且只有一个公共点,试探究:
的面积是否存在最小值?若存在,求出该最小值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/505c6b1bb0214914813bd468e5658abd.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/f33972f039914ebfa9d824c29b1ce058.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/56a73279e3984bf789d920f038332a76.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/01dab6f0505b44b09fe64e1833a4a4ff.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/505c6b1bb0214914813bd468e5658abd.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/56a73279e3984bf789d920f038332a76.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/9927897ec3b34f83b734e2812f0050eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17df11e4f242f1ab2c664127a9cc4274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e47bb98258ebfcf1d8ad4bac10b7ba.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/9927897ec3b34f83b734e2812f0050eb.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/01dab6f0505b44b09fe64e1833a4a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/9927897ec3b34f83b734e2812f0050eb.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/01dab6f0505b44b09fe64e1833a4a4ff.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/3198a5c7ac1b44c19224417bc21c6725.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/9d5e5b28b9fc41f89792b5e3dfb97d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/7c593eff-1103-4bce-9ba1-1a807ac5c37d.png?resizew=337)
(Ⅰ)求曲线C的方程;
(Ⅱ)设动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b65826e98ba9bea060a68b4a66a2555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41bd9a29a1bde0ab8d008769bfd279a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c42b4b5f59cf1e505febfb43f3f4647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572139040808960/1572139046526976/STEM/680e72e7474b455bbfe34e88500a3a49.png)
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2016-12-03更新
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15卷引用:2015年全国普通高等学校招生统一考试理科数学(湖北卷)
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10 . 设函数
,其中
和
是实数,曲线
恒与
轴相切于坐标原点.
(1)求常数
的值;
(2)当
时,关于
的不等式
恒成立,求实数
的取值范围;
(3)求证:
.
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/195ac3f7233b4090b899cc5f4fad2c6d.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/8dc2cd2af92f4d1697947f45668a8e66.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/07d0ba082d3c4d249696c25e52de5420.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/9616fd6d757a4b278f2cce3d24ae9fdf.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/f47cd50f10604378b54783f8dce78b4e.png)
(1)求常数
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/07d0ba082d3c4d249696c25e52de5420.png)
(2)当
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/26061e60f55e438ebc5ab680fa86b381.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/f47cd50f10604378b54783f8dce78b4e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/7e6b6156056e4aed876b6ab88a8712be.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/8dc2cd2af92f4d1697947f45668a8e66.png)
(3)求证:
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499768320/STEM/0770dbc92c5941a8a0249eaf317dbfda.png)
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