2018高二·全国·专题练习
解题方法
1 . 设命题
已知点
,直线
与线段
相交;命题
函数
的定义域为
.如果命题
与命题
有且仅有一个为真命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5aaaa0ee53a0140712e1c16a524386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a11cbd8b8638d6d5e9343e38b7cf37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4d5949f048c934fc0edfad59c4d9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.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/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
2 . 命题
:已知实数
,
满足约束条件
,二元一次不等式
恒成立,
命题
:设数列
的通项公式为
,若
,使得
.
(1)分别求出使命题
,
为真时,实数
的取值范围;
(2)若命题
与
真假相同,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](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/5b089e063780fe3fe9cae55c3acde60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170d2fc7dc3f74cc96c547b3c832615f.png)
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a0533cc57dce5e8c06bdfbe3da8887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590aa40a7b793a26e28ace3c02fdda1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292e11f3e831b2ffefde42cd7f0156c9.png)
(1)分别求出使命题
![](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/0a6936d370d6a238a608ca56f87198de.png)
(2)若命题
![](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/0a6936d370d6a238a608ca56f87198de.png)
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3 . 已知命题
:
,
;命题
:
,使
.若“
或
”为真,“
且
”为假,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420aa38873810dc48e8713856c2fcc91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1262cfba2b91eb7a46765ed83d3b1c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd3f365824183b724a56a4d48eaee84.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/0a6936d370d6a238a608ca56f87198de.png)
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2016高二·全国·课后作业
4 . 已知下列三个不等式:①
;②
;③
,以其中两个作为条件,余下一个作为结论,则可组成几个正确命题?
![](https://img.xkw.com/dksih/QBM/2016/8/29/1826277161189376/1826277161263104/STEM/f3f68ad733c140ac8bc3ffe707bb0110.png)
![](https://img.xkw.com/dksih/QBM/2016/8/29/1826277161189376/1826277161263104/STEM/9229bee46b4d4cecbd320303caeff374.png)
![](https://img.xkw.com/dksih/QBM/2016/8/29/1826277161189376/1826277161263104/STEM/6a42571943d247f8a6fecb233b06dcbb.png)
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2016高二·全国·课后作业
5 . 写出命题“若
,则
的值都等
”的逆命题、否命题、逆否命题,并判断它们的真假.
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741655040/STEM/1bd605a110e44c9d8b5765651a101dc6.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741655040/STEM/6ecab634c580463d841504dd91b8e493.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741655040/STEM/bb23bfbbf7a14ebf895353ed0eeb6ec2.png)
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2016高二·全国·课后作业
6 . 将命题“正偶数不是质数”改写成“若
则
”的形式,并写出它的逆命题、否命题、逆否命题,并判断它们的真假.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ccd5941a5a85812d8c5a14291f92cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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2016高二·全国·课后作业
7 . 设命题
:“若
,则
有实根”.
(1)试写出命题
的逆否命题;
(2)判断命题
的逆否命题的真假,并写出判断过程.
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741638656/STEM/115681313b814dd8bcf5a21ee04e5fca.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741638656/STEM/e30ee88cd8214e2aa4964b250794dc42.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741638656/STEM/d0c4ea65c02c4a9b8b10bc37b2fc7364.png)
(1)试写出命题
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741638656/STEM/115681313b814dd8bcf5a21ee04e5fca.png)
(2)判断命题
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741638656/STEM/115681313b814dd8bcf5a21ee04e5fca.png)
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2016高二·全国·课后作业
8 . 判断“函数
有三个零点”是否为命题.若是命题,是真命题还是假命题?说明理由.
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741401088/STEM/2364fe14880c43bcad9ad278e82e1ba1.png)
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2016高二·全国·课后作业
9 . 将命题“正偶数不是质数”改写成“若
则
”的形式,并写出它的逆命题、否命题、逆否命题,并判断它们的真假.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
您最近一年使用:0次
2016高二·全国·课后作业
10 . 设命题
:“若
,则
有实根”.
(1)试写出命题
的逆否命题;
(2)判断命题
的逆否命题的真假,并写出判断过程.
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741138944/STEM/74fb5eb229924ab7a02acaa848ea5e3d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741138944/STEM/3c19d861d2a14b6faed032cee291bd44.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741138944/STEM/476c109cc2ed415586fd26646b8789f9.png)
(1)试写出命题
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741138944/STEM/74fb5eb229924ab7a02acaa848ea5e3d.png)
(2)判断命题
![](https://img.xkw.com/dksih/QBM/2016/9/26/1826275741057024/1826275741138944/STEM/74fb5eb229924ab7a02acaa848ea5e3d.png)
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