设
,
.若
,则实数a的取值范围是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a0f10891ae716805f2d7aa9e0d884f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2c908a191c6ec7b577941b66439967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
更新时间:2021-12-03 23:39:02
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解题方法
【推荐1】集合
,集合
,若集合
是集合
的真子集,则实数
的取值范围是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77463c988733ae70c738a93b30546b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cfe41cf441a54d34fa97214049ebda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】设
,
,若
是
的充分条件,则实数
的取值范围是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cf7973d3481a313b58403884afd2b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45b6e93797a4189afb0f340817bd1eb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
填空题-单空题
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【推荐1】如图,在长为
,宽为
的矩形地面的四周种植花卉,中间种植草坪,如果要求草坪外侧四周的花卉带的宽度都相同,且草坪的面积不超过总面积的一半,则花卉带的宽度至少应为___________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea92883fe24b097c9a881ef8c92eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/3e6e76ff-cf0f-4884-81ef-5ff23870a70a.png?resizew=144)
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【推荐2】已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0219baf2afa2c68cb915ecc3b1d7f903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efb362e402a1a4604618f4fce86a353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
您最近一年使用:0次