已知
函数
在
上单调递增;
,
.若
为真,
为假,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4a579546fbfc95795d37a2f9f89a4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5c81af39817c57583a0d1c1bebd36e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607e426088f7cd64c621ebf6468bf901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2021-01-29 10:40:52
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【推荐1】设命题p:实数x满足
,命题q:实数x满足
.
(1)若
,且p和q均为真命题,求实数x的取值范围;
(2)若p是q的必要不充分条件,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4998f060c166c0d53d322f5f5dcb39f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18de06e5be01fa3d76043fc0ad1c0a4c.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
(2)若p是q的必要不充分条件,求实数a的取值范围.
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【推荐2】已知命题p:函数f(x)=x2+2mx+1在(-2,+∞)上单调递增;命题q:函数g(x)=2x2+2
(m-2)x+1的图象恒在x轴上方,若p∨q为真,p∧q为假,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
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解答题-应用题
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【推荐1】某商场经营一批进价是每件30元的商品,在市场销售中发现,此商品的销售单价
元与日销售量
件之间有如下关系![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef8dc44824e932f0c222a3246f9490e.png)
(1)在平面直角坐标系中,根据表中提供的数据描出实数对
对应的点,并确定
与
的一个函数关系式
;
![](https://img.xkw.com/dksih/QBM/2017/10/24/1802245609209856/1803695207735296/STEM/d6ac302a1a6a4c338a5b34deaff1c8a8.png?resizew=242)
(2)设经营此商品的日销售利润为
元,根据上述关系式写出
关于
的函数关系式,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef8dc44824e932f0c222a3246f9490e.png)
销售单价 | 30 | 40 | 45 | 50 |
日销售量 | 60 | 30 | 15 | 0 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5283739157785b8bd05d586e31611dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff04a5920eb7fd129a985ad969dd698c.png)
![](https://img.xkw.com/dksih/QBM/2017/10/24/1802245609209856/1803695207735296/STEM/d6ac302a1a6a4c338a5b34deaff1c8a8.png?resizew=242)
(2)设经营此商品的日销售利润为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
并指出销售单价为多少时,才能获得最大日销售利润.
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【推荐2】已知函数
及实数
、
,若
,
,则一切
都有
.
(1)利用以上命题,若对于
,不等式
恒成立,求实数
的取值范围;
(2)利用以上命题,若
、
、
且
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3eb50d14fdee0b5f6f636f8c80893b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3192408b02b2a18368624389f35b0d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceaff1c2f222f8785947f5266e20c3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77b1c3485be1304688c123266ea7fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a56806c9bf7927769af420fdabe96cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
(1)利用以上命题,若对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044281d811019fbf75f52e47dff7ba99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c77877ec9b032507ad961da304f2c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)利用以上命题,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0097ca400d4619a94c4282c1ef6ec68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55c9f1a79c0594ee6ade90d9718aeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4b5d261044c6f58deba8de7c0e1e35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c535a080f846b357fc1c5115140c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a06a1d9af5be3f7fd59d9d5562a07ce.png)
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解题方法
【推荐1】设
.
(1)若命题“对任意实数x,
”为真命题,求实数a的取值范围.
(2)解关于x的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8162ad27aa5287501afe6b0510be0066.png)
(1)若命题“对任意实数x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e674bf3f00e008ef510c783fcfa18219.png)
(2)解关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8feaeeda100cc23ddd87ff970b8a4c25.png)
您最近一年使用:0次
解答题-问答题
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解题方法
【推荐2】设
.
(1)若不等式
对于任意
恒成立,求实数
的取值范围;
(2)解关于
的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe30c3ac283beb5aa65c92ea0b4f0496.png)
(1)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5967cc62862986840af4dd29df4bcc41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7f024c90ebb5c0a7626fcdf04fb24e.png)
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