解题方法
1 . 已知对于任意实数
、
,都有
,特别地,当
、
都为正数时,有
.
(1)已知
,求
最小值为______.
(2)已知
,求
最大值为______.
(3)
都是正数,
,求
最小值.
![](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/775da52de420f9cb8576daae625b0435.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/689f982af451283289255c87593ec338.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41f43df49b4c71f0bdaf6420a06eb28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7c0b6e87ff768d100e8a8f2a0b2eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3124e300e0d08374ac7de2a45b04c2.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82507c7fab925b91b523dc460070977b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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2 . 如图,在Rt
中,
,
,
,
,
为
内心,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3045155183b60255854bf010b457f115.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30912a21aa3d8412f8e020e13ce4cd10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b8a4b0e72a4de1da975168b243a325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624a03a30c48c393ced879c9ef0f4774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3045155183b60255854bf010b457f115.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/8fc7940f-b02d-4bea-b030-29a6ddaf1098.png?resizew=143)
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3 . 已知
,求
为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76425e5e25eb3b8b4d3d42f3f0282530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/230827a2-54c1-449c-a22d-422bece8b5d7.png?resizew=145)
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4 .
,当
时,
,求
的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9b864c09271378438903135192bdc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902e748760713aa242c2344392568368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d462ed4ec22e8fe51f09eb30e8792532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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5 .
,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892560dcff6af9f66a3f735652f69dd7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6ceb607888fe7aed9ca881500caa40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892560dcff6af9f66a3f735652f69dd7.png)
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解题方法
6 . 已知
有实数解,求
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6c4dc30c1a756390a5d4b5f0527ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
7 . 已知
、
为方程
的两根,求
的最小值.
![](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/466fdf55433b08573a053083edb7bb35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7c2af390b1667150182cb9eea8fe3e.png)
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8 . 在四边形
中,
,求
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf87862cc8967ee948741ac8c3a31c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/53ba111b-9e15-49a1-9010-6d642327e9bb.png?resizew=128)
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名校
9 . 已知
,函数
在
上单调递减,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637a8c46baadf3d688fa5ecda3a6f071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3086f2bba36b239134780f0ff35a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2023-02-16更新
|
1677次组卷
|
3卷引用:江苏省徐州市贾汪中学2020-2022学年高一下学期春季竞赛数学试题
10 . 如图,线段
把边长为
的等边
分成面积相等的两部分,
在
上,
在
上,则线段
长度的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e89b6eca35e34c863e832a2c661db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/c6ce0a01-9983-4004-a886-2cafdf932c5f.png?resizew=134)
您最近一年使用:0次
2023-02-16更新
|
501次组卷
|
2卷引用:江苏省徐州市贾汪中学2020-2022学年高一下学期春季竞赛数学试题