解题方法
1 . 若不等式
在
上恒成立,则正实数
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7524cdee6c684c6f56b76881b96f8a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1591d4244dcf5539a4ae98f554e91e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
2 . 已知函数
是定义在R上的单调递增函数,且满足对任意的实数x都有
,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e56dd496ed111e8d06c14df0728368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc576f1102125e8652150e1bd12488d.png)
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3 . 已知函数
(
),若对任意
,总存在
满足
,则正数a的最小值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1982786864f37e6f954e8d70f9970620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6270bb08b90f72d5671ab8225f356c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c50d84d051a6e770d1eeefcdcd58b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859458471c86ae39e0cc42d2d960d03e.png)
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18-19高二下·江苏南通·期中
名校
解题方法
4 . 已知
为定义在
上的奇函数,当
时,
,则不等式
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b64fac396f837765e79ffb7cb78c59d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837151b8ff326973c158f8093ad25cd6.png)
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5 . “解方程
”有如下思路:设
,则
在
上为减函数,且
,故原方程有唯一解
.类比上述解题思路,不等式
的解集为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc8fee13d6f190523ff6699e8fbc749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ffcaabba3c20311125062a56e64993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4ed4485745f1d259a3953c242b9cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a050b963ee0f077ba077d3e60c9f34a4.png)
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2020-04-16更新
|
910次组卷
|
3卷引用:河南省开封市兰考县等五县2018-2019学年高二下学期期中联考数学(理)试题
解题方法
6 . 若函数
在
存在零点(其中
为自然对数的底数),则
的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3068a1277bc31e3fa708ae86dd86b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0b6ca237b90b49a91d9d74d007efdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d6c3d38e6d514f65dd6dee0e6c55b3.png)
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7 . 若函数
有且只有一个零点,
是
上两个动点(
为坐标原点),且
, 若
两点到直线
的距离分别为
,则
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ee62ad53f6f54052f1e917e949b898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40a40ff6043a6cdd3b6f0cb4bd9099d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb5833a4faa5be16c96278a35a92c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e038856f2f17526001f8d70bd82a8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2f1c1409a06278e847e6b573cef254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a4b32d388558eb9a9e4f0f2dd57c09.png)
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8 . 已知
,
,
分别为锐角
的三个内角
,
,
的对边,若
,且
,则
的周长的取值范围为__________ .
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1af7139968cf11cf761c8a2bfdd8c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
9 . 若函数
在区间
内有两个不同的零点,则
的取值范围为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d52a67018daa5cd6f223ac96baf87c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8938db94f49dcbe0c383fba0241bb0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
10 . 已知定义在R上的函数F(x)满足
,当
时,
.若对任意
,不等式组
均成立,则实数k的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f4d5c88583f100f49aa5c43d4b96ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02a5802f50d0bac17f22f9a18f3d5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f20421dabb0a72b261b4659fb09c3dd.png)
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