已知二次函数
对
都有
成立,且
.
(1)求函数
的解析式;
(2)若函数
在
上的最小值为
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e1d8e00d825b488a456999175d1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27c24244b1fdbf1455087c2ebf41c8b.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2eb8182e025c2c0bf0661148b91ac99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b0ddd737110548e7a57d5be682f146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2018-10-30 12:32:05
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解答题-证明题
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【推荐1】已知二次函数
(
).
(1)若
,图像
与
轴的两个不同交点的横坐标都在
内,求证:
;
(2)若存在
,满足
,则称
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的一个“近似整零点”,若
有四个不同的“近似整零点”,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47acdaa7db189fa7b579edbadaf115d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178d3b6b79663145d640d0d6d9a11b13.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb3831fb0762883e3b6ab58f6321c33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ee09c7fe0c719ee6b367522d95a143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知函数
(
,
).
(1)若函数
的图象与直线
均无公共点,求证:
;
(2)若
,
时,对于给定的负数
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,使
时,都有
,求
为何值时
最大?并求
的最大值;
(3)若
,且
,又
时,恒有
,求
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce086037087f58409a28b4885979fd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3051f43ac48c0a730a791b8a93ad37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abffa1d225ca1e8bd2d15ab6d3ad9a50.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9439d9d9bc4f93dce4b94d1e33e06bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760f804646698060703c5458ff5637c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044934f7dbd6847a30f13a34c9bb4e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdb19e1863e40b863519bca9edcdf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760f804646698060703c5458ff5637c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760f804646698060703c5458ff5637c7.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77cdb8806a697e8e5480fad9c380baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdf1eec5487c094e8d38cbc77b91604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐1】已知函数
,
,其中
.
(1)若
,求函数
的单调增区间;
(2)若不等式
在
时恒成立,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8944834385332001a50dbf8449caa34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3206965870982fe2c7113f796d93719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ee160e966bead615d7c02ff313e903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eac2b31a19918895e5af2d316490e7.png)
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【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97acfcaa067feddec59d3a62770c3ff.png)
(1)当
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(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97acfcaa067feddec59d3a62770c3ff.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5d5eda32d769114328fbed40f44c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
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【推荐1】已知二次函数
满足以下条件:①经过原点
②
,
③函数
只有一个零点
(1)求二次函数
的解析式;
(2)若对任意
,
恒成立,求实数m的取值范围:
(3)若函数
与
的图象有两个公共点,求实数t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b6a9ffffc0c461881b427c543924cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/935799b8d9f3de0c021e2a7df70d96f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190a6120c3330c51d0823c8bd8991b2a.png)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f698c5a46ab32f72dc313d37f024accf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d23e92f9e145cf650d43affe7d5b03.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8082b007c399bb2e4cceb668c84f99d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41eae03fbd650f093324d11b6ea7429.png)
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解题方法
【推荐2】设
且
.
(1)若
,且满足
,求
的取值范围;
(2)若
,是否存在
使得
在区间
上是增函数?如果存在,说明
可以取哪些值;如果不存在,请说明理由;
(3)定义在
上的一个函数
,用分法
:
,将区间
任意划分成
个小区间,如果存在一个常数
,使得不等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75def96146682b68427b251b1d4e2878.png)
恒成立,则称函数
为在
上的有界变差函数.试判断函数
是否为在
上的有界变差函数?若是,求
的最小值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258ed733ce0c8321e526c4ac3068221b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fa1476cf3552b9ae91ef039b1c6c80.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c43aaeea539c82de01e36e13f2c5395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752d8db8a05b3ec7312f6ac8b64a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ff308ff14f24b801ab1e00e892fc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ca681ae72055316ef35c01fdb27034.png)
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(3)定义在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be35b4d8f52e8f440297683c3178e22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b426608a06477f57cb994f4d00e4465d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a30ee763bcdda2021848f3f24c2564d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be35b4d8f52e8f440297683c3178e22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75def96146682b68427b251b1d4e2878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d9f4fb116385718fbca94e61371250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b426608a06477f57cb994f4d00e4465d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be35b4d8f52e8f440297683c3178e22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9567f5e5a976181d392c3a3634e95b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ca681ae72055316ef35c01fdb27034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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