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1 . 下列命题中正确的是( )
A.命题“![]() ![]() ![]() ![]() |
B.已知![]() ![]() ![]() ![]() ![]() |
C.“![]() ![]() |
D.已知![]() ![]() |
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湖北省孝感高级中学2020-2021学年高二下学期2月调研考试数学试题(已下线)第1章《常用逻辑用语》章节复习巩固基础练-2021-2022学年高二数学同步训练精选新题汇编(人教A版选修2-1)湖北省荆门市钟祥市实验中学2020-2021学年高二下学期5月阶段检测(1)数学试题山西省太原市第五中学2022届高三下学期二模文科数学试题
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2 . 下列4个说法中正确的有( )
①命题“若
,则
”的逆否命题为“若
则
”;
②若
,则
;
③若复合命题:“
”为假命题,则p,q均为假命题;
④“
”是“
”的充分不必要条件.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8a2a94168af9b16ce89271a5d8dc6b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614d831db7632762b938cc37c8ac73de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397af7a732f39b6b7c30d4e4bdbe40a5.png)
③若复合命题:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d141f34f18f4802d04ef2e4e5e803aba.png)
A.①②③ | B.②③④ | C.①②④ | D.①③④ |
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8卷引用:四川省阆中中学2020-2021学年高三上学期开学考试数学(文)试题
3 . 写出下列命题的“
”命题:
(1)正方形的四边相等;
(2)平方和为
的两个实数都为
;
(3)若
是锐角三角形, 则
的任何一个内角是锐角;
(4)若
,则
中至少有一个为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037d29525d118dc083dc3e5e808ca2b.png)
(1)正方形的四边相等;
(2)平方和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456936817c4790d98b84c5a3cf17855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
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