已知命题
:若
,则
,下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccaa6e503b61e9ae78d8439cba2e328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199e9b71bddd6f73725518ab2d567b32.png)
A.命题![]() ![]() ![]() |
B.命题![]() ![]() ![]() |
C.命题![]() |
D.命题![]() |
更新时间:2018-02-28 14:17:32
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【推荐1】下列四个命题中真命题的个数是( )
①命题“若
,则
”的否命题;
②命题“若
,则
"的逆否命题;
③命题“若
,则
”的逆命题;
④命题“
,
”的否定为“
,
"
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd940a1fab0e50b423c879af9934e176.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b83a660527359758db64e6566466293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e07ade7560a1179342ddecf4ce9dac.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37660096fb35820bc02bb27d58195fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8ba7b319b94f184eda5f81101313b.png)
A.![]() | B.2个 | C.![]() | D.4个 |
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解题方法
【推荐2】设集合
,命题
:
,命题
:
. 若
和
中有且只有一个为真命题,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158db88ff330866fb086ea4555776430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a2410ce34b36954ed4923e600d42f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed961de27af72b7d11887ccfb6f15071.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)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】下列命题中,说法错误 的是
A.“若![]() ![]() ![]() ![]() |
B.“![]() ![]() |
C.“![]() ![]() |
D.“若![]() ![]() |
您最近一年使用:0次
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名校
【推荐2】下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.函数![]() ![]() |
B.若命题![]() ![]() |
C.命题:“若![]() ![]() ![]() ![]() ![]() ![]() |
D.命题“![]() ![]() ![]() ![]() |
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【推荐1】已知命题“函数
定义在R上,
,如果
均为奇函数,则
为偶函数”的原命题、逆命题、否命题、逆否命题中正确命题的个数是
![](https://img.xkw.com/dksih/QBM/2016/5/20/1572642983419904/1572642989228032/STEM/0890e18598d14c51a665b07fc9031af2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/20/1572642983419904/1572642989228032/STEM/1c9af8d2a1864328b5d340ceb107497b.png)
![](https://img.xkw.com/dksih/QBM/2016/5/20/1572642983419904/1572642989228032/STEM/0890e18598d14c51a665b07fc9031af2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/20/1572642983419904/1572642989228032/STEM/af6d45fbc8e74c17bc77c76882287739.png)
A.0 | B.1 | C.2 | D.3 |
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【推荐2】已知
,
,给出命题:“
,
,若
,则
”,则它的逆命题、否命题、逆否命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dad48527a47eab4a5916ab0421cc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dad48527a47eab4a5916ab0421cc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5977232839b54df456aeeacb13512d.png)
A.0个 | B.1个 | C.2个 | D.3个 |
您最近一年使用:0次
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【推荐1】下列四个命题中正确命题的个数是( )
①命题“若
,则
”的逆否命题是“若
,则
”;
②“
”是“
”的必要不充分条件;
③命题“若
则
或
”的否命题是“若
,则
且
”;
④“
,
”的否定是“
,
”.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8a2a94168af9b16ce89271a5d8dc6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
②“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d141f34f18f4802d04ef2e4e5e803aba.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d480f0fe759b6773d568ea7bcd2f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c412d5329ba909164329663b7eecdfe.png)
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35eac3ba2858adffcd1f8052cd795269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f82b60f0d3840ed8cb1946383023e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8552695a1ae885928d732bbae8f2f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8214d551ac878447eeb64df644dae2a.png)
A.0 | B.1 | C.2 | D.3 |
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名校
【推荐2】命题“若
,则
有实数根”与其逆命题、否命题、逆否命题者四个命题中,假命题的个数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
A.0个 | B.1个 | C.2个 | D.4个 |
您最近一年使用:0次