已知函数
的定义域为
.
(1)当
时,求函数
的值域;
(2)若函数
的最小值为3,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5a362a604b4711c763b659c43d18e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5432187d1c042787433b7633292d00fe.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2017-11-14 17:48:01
|
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解答题-问答题
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(0.4)
名校
解题方法
【推荐1】已知函数
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.
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(2)当
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使
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(3)若
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,是否存在常数
,使区间
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?若存在,求出
的值,若不存在,请说明理由.(注:区间
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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5985edb42f440282a7d008cfe3177cf8.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d5a5e70f64f0933ae1e4ddec5fa2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17641d15644d5fb2c79fd1016b21520f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e63bbadc6250f7139836ede33205550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616a78c622e70694a9370588108ad127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0507d73ad6e1fafcedfdf678478430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be35b4d8f52e8f440297683c3178e22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701fce58a3087d253fd4fa948030eb50.png)
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【推荐2】已知
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(3)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9c057d3705b06389ce074e7a73331b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04bce7116f7e2e5fcda300176cc527ed.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8d122f7ce1b4ccda26dc4b012f6fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e12da7b76cf0aeff450131179669aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41da8d7c02b8829d1e5a3b01086cc562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3b818060c94f0ba4ed9836ac980039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab5ffe226493f4e86c6598a7e0c770e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b0ec27813138c0d20563c070030c9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】已知二次函数
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和
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(1)若函数
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上不单调,求实数
的取值范围;
(2)若
,且函数
在区间
上有最小值2,求实数
的值;
(3)设
,且
,是否存在实数
,使函数
定义域和值域分别为
和
,如果存在,求出
、
的值;如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b32f9a3b4fe7954360d1502e8dfa20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672f564d03ed46d092bb130f229ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7715e573728327f68bcd16017c55939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70238df11ff9435353fd76e75535e4a.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672f564d03ed46d092bb130f229ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94a473bb10859d6786d0cdecb94e809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52cab7249a4f7984a32b4fc78a457ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672f564d03ed46d092bb130f229ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72f28bdcf8448444e118783361532f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61862305000c7b8cea564a9788cc765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8151bdd576c761122ace0cdc509f48e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b911d4d1a8b2d3dfa97074393fbfdc35.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd8466b576ad34d6ef492599940f4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7911abde8366b13ed3fbee8fb1ac25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】函数
,其中
值域是
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ef1e5b5f6321295836047add90ee77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263717fbf803e78bdc8a716698e247df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e846c2563b54d7b68e51119addda5022.png)
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