已知函数
.
(1)求不等式
的解集;
(2)当
时,不等式
对任意的
恒成立,求实数t的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8eea52e546f3f2a7d8a4c3891b32712.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d9703ec5eee8074ba7fbe0e899b336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dbc611d2b155be81d59fca5f8ac1623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
更新时间:2020-07-04 12:36:18
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【推荐1】已知集合
,记函数
的定义域为集合B.
(1)当a=1时,求A∪B;
(2)若“x∈A”是“x∈B”的充分不必要条件,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d8afc2368c953e7fca52ac13a1ea19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72bbfc25a612378da0012c0efc0111de.png)
(1)当a=1时,求A∪B;
(2)若“x∈A”是“x∈B”的充分不必要条件,求实数a的取值范围.
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适中
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解题方法
【推荐2】在①
,②
,这两个条件中任选一个,补充在下面的横线上,并回答下列问题.设全集
,______,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa3dde3f7fde521e1f189db075c2f02.png)
(1)若
,求
;
(2)若“
”是“
”的充分不必要条件,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d799bb22584519f45373fad2b62286a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249ae8c224fce98cf4ff0f9e20e75634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0dc8098ad6f31bdd87771ca9cfa33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa3dde3f7fde521e1f189db075c2f02.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfebbdc092f4dc3a8dbe73ee52a02c96.png)
(2)若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
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解答题-问答题
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适中
(0.65)
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【推荐1】已知函数
(
).
(1)若
,求函数
在
上的最小值;
(2)若
,且不等式
在
上恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2814fc363664bbb6f1edaa1330998474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b55b3a3f1324c1935c84061a22581e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb584bbe5dbf0438934967b942521013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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适中
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【推荐2】选修4-5:不等式选讲
设函数
.
(Ⅰ)若不等式
的解集为
,求
的值;
(Ⅱ)若存在
,使
,求实数a的取值范围.
设函数
![](https://img.xkw.com/dksih/QBM/2015/7/15/1572181905178624/1572181910896640/STEM/423fe6897463415e963fbe9456849cac.png?resizew=139)
(Ⅰ)若不等式
![](https://img.xkw.com/dksih/QBM/2015/7/15/1572181905178624/1572181910896640/STEM/df48b90655d54353a43287cdf3e63d25.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2015/7/15/1572181905178624/1572181910896640/STEM/5a8603f6bd364f6fb9ada7d0e234b004.png?resizew=88)
![](https://img.xkw.com/dksih/QBM/2015/7/15/1572181905178624/1572181910896640/STEM/4840529e3f6a40c8941ef93a5674fc77.png?resizew=13)
(Ⅱ)若存在
![](https://img.xkw.com/dksih/QBM/2015/7/15/1572181905178624/1572181910896640/STEM/df3e118bf471492784752aa9261e0bb3.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2015/7/15/1572181905178624/1572181910896640/STEM/c648c975b193416e8263d1b6a4a5e94b.png?resizew=97)
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