已知函数
有两个不同的零点.
(1)求
的取值范围;
(2)记两个零点分别为
,且
,已知
,若不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81344623eb224cd50013c7ba7844bfa8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)记两个零点分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e54d9d58351f93443ed79f38b99513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
17-18高三上·广西南宁·期末 查看更多[4]
2017届广西南宁市金伦中学高三上学期期末考试数学(理)试卷四川省南充高级中学2018届高三9月检测数学(理)试题江西省临川第二中学2018届高三上学期第四次月考(期中)数学(文)试题(已下线)广西南宁市金伦中学2017届高三上学期期末考试理数试题
更新时间:2017-03-06 12:50:29
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真题
【推荐1】已知函数f(x)=lnx﹣x+1,x∈(0,+∞),求函数f(x)的最大值;
(2)设a1,b1(k=1,2…,n)均为正数,证明:
①若a1b1+a2b2+…anbn≤b1+b2+…bn,则![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/49f34411c0ef4df98faed98205fe32a7.png)
…
≤1;
②若b1+b2+…bn=1,则
≤![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/fe1977caa7284a9d8ca9d900f60ed1d2.png)
…
≤b12+b22+…+bn2.
(2)设a1,b1(k=1,2…,n)均为正数,证明:
①若a1b1+a2b2+…anbn≤b1+b2+…bn,则
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/49f34411c0ef4df98faed98205fe32a7.png)
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/d0477e4c484d45b79c42365f68b099e6.png)
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/db122dcbf85441ab8caaaaf39e892c83.png)
②若b1+b2+…bn=1,则
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/4da1c0450d4b42f1a905e79b2f1dca33.png)
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/fe1977caa7284a9d8ca9d900f60ed1d2.png)
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/e8315771c82b425a883f31b0f2215985.png)
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295283200/STEM/5b97963255eb403d90413d0998b6a3d5.png)
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名校
【推荐2】如果函数
在其定义域内存在实数
,使得
成立,则称函数
为“可拆分函数”.
(1)试判断函数
是否为“可拆分函数”?并说明理由;
(2)证明:函数
为“可拆分函数”;
(3)设函数
为“可拆分函数”,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c3f77c4d399c6ce669406032c7b7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)试判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ede389b43c78417912542746d91d00.png)
(2)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4a93f87af7c854415faae61d6a3770.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16e07631b59c477c2e56ddb75f10985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】已知函数
(
,
),
.
(1)讨论
的单调性;
(2)当
时,不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819b3b823470a54fb4296dc62a6fa88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31291daddb667739ef98922fb83ef61f.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa18838a13fda4e45612c32cdf98b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
【推荐2】已知函数
,其中
.
(1)当
时,
,求a的取值范围.
(2)若
,证明:
有三个零点
,
,
(
),且
,
,
成等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d8543507212b830a2a03d4a8f6d139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8c164755dc2d7cff80fb4c9cffc9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301605e86e5a5e61a65c91cd3dd8b77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1310a7a80d1f8751a3f8cafe7f8c8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
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困难
(0.15)
【推荐3】已知函数
,
,其中
是自然对数的底数.
(1)若对于任意实数
,不等式
恒成立,求实数
的取值范围;
(2)设
,求证:当
时,
恰好有2个零点;
(3)若曲线
在
处的切线与曲线
也相切.判断函数
的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ba70b48aedfd52e2443e3bdcfbdf7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae4a780fd353099dbbf6984ca6630b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
(1)若对于任意实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6582b8e5ef0c8a9838dc1b2d9cae4529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6141d2c90a326325eaf3926809f56b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6e720a3bf39395169f57f553199012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
(3)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c17fe37f9c3ce9bdc000ed0e4b1fcc1.png)
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【推荐1】已知函数
.
(1)若
在
处的切线斜率为
,求实数a的值;
(2)当
时,判断
的极值点个数;
(3)对任意
,有
,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8c2247c818c6368b038e5f3fba16c6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ed308cb7e8f9be16ce8e51fd2626ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee2bc806ee2de8757350bd6e7ef37da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66d61d5f66d68b4c4a2a25fd7103621.png)
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困难
(0.15)
【推荐2】已知函数
,其中
;
(l)判断函数
是否存在极值,若存在,请判断是极大值还是极小值;若不存在,说明理由;
(2)讨论在
上函数
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a0bba7db5b38948ee3f8200e5b6e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d0588454ec8b64bf86578fb90b39e2.png)
(l)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)讨论在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e491151109a22b53131ba3203da29837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解答题-证明题
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(0.15)
名校
【推荐1】设函数
.
(1)当
时,若直线
是曲线
的切线,求
的值;
(2)若函数
在区间
上严格增,求
的取值范围;
(3)若
且满足
,对任意的
,恒有
,求证:对任意的
,当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e99b2155565e0832a2bc405cd29843.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a9b769d70cb6f29e965c800921c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e54c5da8061411e6659614a6511a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca83d5dea2d5c02ac18a9c9496ca57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1313a22f7070883f17d39700f383b504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe276c0522839b1d37086d92612aa7c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3d1fe6dd2ff21f192e14fd85062fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8deeaabea77488158d0a98639e02ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af041a320a49a5db1828a26c0613ec89.png)
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名校
解题方法
【推荐2】函数
,其中
,
为常数.
(1)若
时,讨论函数
的单调性;
(2)若
时,不等式
在
上恒成立,求实数
的取值范围;
(3)若
,当
时,试比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2074d9212fe631bd421f514d8ac3fc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/256f3981024e53f373a80aad40e994ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaae91ed6da60e86e3bb9b3eb7e03e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88595a898f2848c54f0fb32c3338950b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c598d9af33139205c69a18297e43c2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
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(0.15)
名校
【推荐3】已知函数
和
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)求
在
处的切线方程;
(2)若当
时,
恒成立,求
的取值范围;
(3)若
与
有相同的最小值.
①求出
;
②证明:存在实数
,使得
和
共有三个不同的根
、
、
,且
、
、
依次成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff6838d84b68c6f0d3b93b196d9b08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d210070cc28a32cd9c3e848e195726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(2)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4921923069c4f38a0af1ff8637e35b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/952a0cde9449eef7c5f11385c7432e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b00d47ef1d331094530990ffe38e1d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
①求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②证明:存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7aec235f9df6700f3cbc89c8bcecb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8ad137a5bf6b24e0dd8dff417c31cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fc0ce080b8ad8b63ba63259c680b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
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