已知关于x的不等式
的解集为
.
(1)求实数m,n的值;
(2)正实数a,b满足
.
①求
的最小值;
②若
恒成立,求实数t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15df4f4655370c96c4a56616f98b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613f39b0513bd8a6922ce0db193251f8.png)
(1)求实数m,n的值;
(2)正实数a,b满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad33d253845f1e23df146f9d7fec76a5.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a794f141df4fc97ab143b1fbe3ba6ed8.png)
更新时间:2021-01-27 20:08:14
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【推荐1】若关于x的不等式
的解集为
或
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(1)求a,b的值;
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【推荐2】设函数f(x)=ax2+(b-2)x+3(a≠0).
(1)若不等式f(x)>0的解集(-1,1),求a,b的值;
(2)若f(1)=2,
①a>0,b>0,求
的最小值;
②若f(x)>1在R上恒成立,求实数a的取值范围.
(1)若不等式f(x)>0的解集(-1,1),求a,b的值;
(2)若f(1)=2,
①a>0,b>0,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448272305e1d2d64b6622a9dd4cf80fc.png)
②若f(x)>1在R上恒成立,求实数a的取值范围.
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【推荐1】如图,四棱锥
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,PB⊥底面ABCD,
,设平面PAD与平面PBC的交线为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/26/9629643c-04ec-4e7f-a2a9-87a9b9c6eafd.png?resizew=161)
(1)证明:
平面PAB;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666c7e13a7999bd5970c1e478a665935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a915ebf5347aa0762ae3b9d205745e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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(1)证明:
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(2)设Q为
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【推荐2】已知a,b,c为正实数,且满足a+b+c=1.证明:
(1)|a
|+|b+c﹣1|
;
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(1)|a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14cbba527df090fb25643ba11d0e2ee3.png)
(2)(a3+b3+c3)(
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【推荐1】已知实数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d389f7fba8fb3ba8b9bac28ea50a16a.png)
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【推荐1】已知函数
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【推荐3】某社区计划在长方形空地ABCD上建一座供社区居民休闲健身的小型广场、做如下规划:在空地中的点M处修建一座凉亭,经过点M铺一条直直的小径EF,小径EF把空地分割成两块梯形区域,计划在梯形区域AEFB处修建休憩棋牌区,在梯形区域
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米,
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)
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上,修建一个以点
为顶点,其余各顶点分别在
上的正方形耐踏草坪,设草坪的边长为
米,求函数
的值域.
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/21cf500b-f98f-4a2a-abb5-da1468d7e664.png?resizew=177)
(1)设小径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55db12bc9a3b7bd2e6decaaea6ba387e.png)
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