已知函数
,
.
(1)若
,求使
的x的取值范围;
(2)当
时,设
,求
在区间
上的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9e5c2f3e134ee0bb885fdc71c99c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e357538192b0086515ca082025dad9b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189b2da6c420bf8f8900002d14f65f72.png)
更新时间:2024-05-12 00:21:22
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【推荐1】设集合
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(1)若
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58557d60243f7abe620a75928664a188.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbbe46a98a8fdebfc46fcbc45dc88e8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638ae93b9a2d900c14e58cbc047ea8c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】若a>0,b>0,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636177ad3408ce13a34b44006c573531.png)
(1)求
的最小值;
(2)是否存在a,b,使得2a+3b=5?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636177ad3408ce13a34b44006c573531.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2b05214c8b22507f0c36b110593d0a.png)
(2)是否存在a,b,使得2a+3b=5?并说明理由.
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解题方法
【推荐2】某广场欲建一块![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11884ea468894d9cc30eddc09b4a39ab.png)
的矩形绿地,在绿地的四周铺设2
宽的人行道,如图所示.设矩形绿地的长为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
,绿地与人行道一共占地![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/bdda3584-9747-4706-8860-550b2b6cd331.png?resizew=138)
(1)试写出
关于
的函数关系式;
(2)求
为何值时,占地面积
最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11884ea468894d9cc30eddc09b4a39ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/bdda3584-9747-4706-8860-550b2b6cd331.png?resizew=138)
(1)试写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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