已知p, q都是r的必要条件, s是r的充分条件, q是s的充分条件, 那么:
(1)s是q的什么条件?
(2)p是q的什么条件?
(1)s是q的什么条件?
(2)p是q的什么条件?
17-18高二·全国·课后作业 查看更多[1]
(已下线)活页作业3-2018年数学同步优化指导(北师大版选修1-1)
更新时间:2018-11-13 23:35:27
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解题方法
【推荐1】已知集合
,集合
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9acf0799c5ba301d5de6c72b53714c8f.png)
(1)求集合
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(1)求集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
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【推荐2】已知
,
.
(Ⅰ)若
是
的必要条件,求实数
的取值范围;
(Ⅱ)若
,“
或
”为真命题,“
且
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的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53aea1267458093b1e043b9a34a252fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458e3532d82916aac4f7ad21c10f3f86.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e26b38e357c7d985656ba7bb3c794a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(Ⅱ)若
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【推荐1】设
或
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.
(1)若
时,p是q的什么条件?
(2)若p是q的必要不充分条件,求a的取值范围.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df97968908a5810d40d9dcc4c233fed.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8e1dd8da540badcb9a8f427c5b202e.png)
(2)若p是q的必要不充分条件,求a的取值范围.
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【推荐2】如图,已知矩形
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上的点,探求存在点
使
的充要条件.
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