已知
为
边
上一点,且满足
,不等式
恒成立时,实数
的最值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474ae5ae1633c05fee5dbd50553a48b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e6cd426139d133199330c7b43ea388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2021-08-09 08:26:11
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填空题-单空题
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适中
(0.65)
名校
【推荐1】已知
,
,
,则
的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a871ef7bf13de3e15489d65b57a3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9a6d9c9d8766a4f473488ef341a130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db6dbf65838cbb2d04a8229ba40da79.png)
您最近一年使用:0次
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【推荐2】已知正实数
,
满足
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a4789deb5c1a041393c0110a453277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04e3b272ff3f38a5b790a36ff6f275f.png)
您最近一年使用:0次
填空题-单空题
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适中
(0.65)
【推荐1】若对任意
,
恒成立,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f84c5a35589f723bfcf5c9a3c94fed.png)
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您最近一年使用:0次
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【推荐2】已知不等式
对一切正数
恒成立,则实数
的取值范围是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c500175b5e3e0890320042c0a23e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
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您最近一年使用:0次
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解题方法
【推荐1】向量集合
,对于任意
、
,以及任意
,都有
,则称集合
是“凸集”,现有四个命题:
①集合
是“凸集”;
②集合
是“凸集;
③若
、
都是“凸集”,则
也一定是“凸集”;
④若
、
都是“凸集”,且交集非空,则
也是“凸集”;
⑤若集合
是“凸集”,则
一定不是“凸集”.
其中,所有正确的命题的序号是__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73b4fad12b6f4420bc320b11a278f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37c1870a8601323a0fefb2f90c669f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe62a251f3d6dfb60ba2a42bdda534c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d86fcd178244fa8731df0ed6f981263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
①集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/214870cc10be3ab7bf66fae274517be4.png)
②集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8900d3ce5d983d0a19de9f65f987b5bf.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2646f41226f24960a6186dc7860ef45.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b76d26b78e63683dfacf10d3da6d74d.png)
⑤若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee035c6c34eef4268a150dab13117e9.png)
其中,所有正确的命题的序号是
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解题方法
【推荐2】若点
在以
为圆心,6为半径的弧
上,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8510ba07bd64dd7bcc654f3c47e9ddc.png)
,则
的取值范围为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d5bb3031d527aa204fcbfb5de0f34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8510ba07bd64dd7bcc654f3c47e9ddc.png)
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