已知命题
;命题
,若
且
为假,
或
为真,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2d54c264716f1c65a1522bb41907bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea284dd0f7e05b9ae6f549dd1d4115c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2020-03-04 22:37:56
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适中
(0.65)
【推荐1】已知
.设命题
函数
在
内单调递减;命题
曲线
与x轴交于不同的两点.若p或q为真,p且q为假,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810949b76573ccd9d43af3815299d443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
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(0.65)
【推荐2】已知命题
:
,
;命题
:函数
无零点.
(1)若
为假,求实数
的取值范围;
(2)若
为假,
为真,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe318c8c85ee19aac14b52cab972f0b8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57930d668138cfd28dab55f24f0647e5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e26b38e357c7d985656ba7bb3c794a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】已知函数
,函数
的图象与
的图象关于点
中心对称.
(1)求函数
的解析式;
(2)如果
,
,试求出使
成立的
取值范围;
(3)是否存在区间
,使
对于区间内的任意实数
,只要
且
时,都有
恒成立?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9261dcb08aba06d24e331d5049f0bb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544f91d4fb22c571db9f8481b72a0419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d655ee6d4c2285b6f59652360862d2.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe46513221da1b16ffe497a825b0e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041809b54951a7d2e480eb6b37e7c546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8aa839dcd6fcfad871dd2e67d2e8ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)是否存在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f2ac7d62be1c5f4c65435585a6ae6b.png)
![](https://img.xkw.com/dksih/QBM/2011/12/22/1570628645380096/1570628650975232/STEM/2fb8da5ce6a141988bb149524b791a6a.png?resizew=13)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac69e6db1df13ed64756b4f391ae9fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96d4e4e1775e319b6a740ec72ea8bc6b.png)
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解题方法
【推荐2】已知全集
,集合
.
(1)当
时,求集合
;
(2)若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a64dc61989ca50b9ee19d835c4ed268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5bc145f47b6e657a2732086948ae60.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70f090e9f1e297f35a6bad84d9aad21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】培养某种水生植物需要定期向水中加入营养物质N.已知向水中每投放1个单位的物质N,则t(
)小时后,水中含有物质N的浓度增加ymol/L,y与t的函数关系可近似地表示为
根据经验,当水中含有物质N的浓度不低于2mol/L时,物质N才能有效发挥作用.
(1)若在水中首次投放1个单位的物质N,计算物质N能持续有效发挥作用的时长;
(2)若
时在水中首次投放1个单位的物质N,
时再投放1个单位的物质N,试判断当
时,水中含有物质N的浓度是否始终不超过3mol/L,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2a2cb8a29defa041fe2a264012c689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4444fc68e3077497c241e4987dacce6b.png)
(1)若在水中首次投放1个单位的物质N,计算物质N能持续有效发挥作用的时长;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a50cdbc30b1170012e942c60e93854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f4d48734d55263d3d9e763b4538f41.png)
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