1 . 已知
.
(1)若
是
的必要不充分条件,求实数
的范围;
(2)若
是
的必要不充分条件,求实数
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb67b053a005ace5be3e60dca09813d.png)
(1)若
![](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)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e26b38e357c7d985656ba7bb3c794a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2 . 已知
:
,
:
.
(1)若
是
的必要不充分条件,求实数
的范围;
(2)若
是
的必要不充分条件,求实数
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9403c598bbb48468b9a9ab662f24e793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed08e1bc01a2f627164e7fce8ff0e03.png)
(1)若
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3e442eb9fae52d740b600bff0ee4aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6659e3aec36b969f21633c5efe3ac46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
3 . (1)若
或
,则
.写出其逆命题、否命题、逆否命题,并分别指出真假;
(2)设原命题是:当c>0时,若a>b,则ac>bc,写出其逆命题、否命题、逆否命题,并分别指出真假.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a878fd5a7104a7f42770a19097d56457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bdfc6e53ec0af4942365bb570c6741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dff3ece45bf6c91d9dd8d07ae72584d.png)
(2)设原命题是:当c>0时,若a>b,则ac>bc,写出其逆命题、否命题、逆否命题,并分别指出真假.
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4 . 写出命题“已知,a b 是实数,若ab=0,则a=0或b=0”的逆命题,否命题,逆否命题,并判断其真假.
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5 . 写出下列命题的逆命题、否命题以及逆否命题:
(1)若
,则
;
(2)已知
为实数,若
,则
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ee4849f60afce5a3a85ccd492314e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0219e415740558b6d03038c91c9f3689.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d10449bc77d692a7270e0f20a68cdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648bb8829ffc34b7b466b1bb05777103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af27075a29a658a88bec069fe4804da.png)
您最近一年使用:0次
20-21高二·全国·单元测试
6 . 分别写出下列命题的逆命题、否命题、逆否命题.
(1)垂直于平面α内无数条直线的直线l垂直于平面α;
(2)设a,b,c,d是实数,若a=b,c=d,则a+c=b+d.
(1)垂直于平面α内无数条直线的直线l垂直于平面α;
(2)设a,b,c,d是实数,若a=b,c=d,则a+c=b+d.
您最近一年使用:0次
7 . 已知原命题是“若
,则曲线
是椭圆”.
(1)试写出原命题的逆命题、否命题、逆否命题,并判断所写命题的真假;
(2)若曲线
是焦点在
轴上的双曲线,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d364ffe09abd0f6022147d130c82dccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e32500972421f941c78967a4948921.png)
(1)试写出原命题的逆命题、否命题、逆否命题,并判断所写命题的真假;
(2)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e32500972421f941c78967a4948921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
8 . 已知命题
;
.
(1)若
,写出命题“若
则
”的逆否命题,并判断真假;
(2)若
是
的充分不必要条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e37a4ac519b313ee0c91ab75b37270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1322eaaebbe6b54b72515e3603cd02.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(2)若
![](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)
您最近一年使用:0次
2021-01-28更新
|
107次组卷
|
2卷引用:山西省太原市2020-2021学年高二上学期期末数学(理)试题
9 . 已知原命题是:“若
,则
”.
(1)写出原命题的逆命题、逆否命题,并判断上述二个命题的真假;
(2)已知
,如果“
”是“
”的充分不必要条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e4848e12d90125411fb07a7e524de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
(1)写出原命题的逆命题、逆否命题,并判断上述二个命题的真假;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e4848e12d90125411fb07a7e524de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c386d932be86f7caed4d23ecd509ad75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
10 . 写出命题“若m<1,则一元二次方程x2 +x+m=0有实数解”的逆命题、否命题和逆否命题,并判断它们的真假.
您最近一年使用:0次