给出下面结论:
(1)命题
“
,
”的否定为
“
,
”;
(2)若
是
的必要条件,则
是
的充分条件;
(3)“
”是“
”成立的充分不必要条件.
其中正确结论的个数是( )
(1)命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e764325b614f3d025e5afff7dcb5a421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e600d9843ce406c441b402837d0388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44abc4323b97e777f8775b411b13fe67.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.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/9e26b38e357c7d985656ba7bb3c794a5.png)
(3)“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8f97cf2fc2d0676d6df01ff9759611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f660f89f35118b60a862eba71e25f6.png)
其中正确结论的个数是( )
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-12-17 21:26:33
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【推荐1】已知
:“函数
在
上是增函数”,
:“
”,则
是
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2f80962e55a4d6da60361355a8eeb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fe3414b32bbd1190b41ed8307f905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52fb51c831740d9fe307c03537080448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
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解题方法
【推荐2】命题“
,
”为真命题的一个充分不必要条件是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c7e73075eb82517587ea69bb59ecc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a478e8f58b0854f380626b92eb24489.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】有下列三种说法:
①命题:“
,使得
”的否定是“
,都有
”;
②若
,
都是实数,则“
”是“
”的既不充分也不必要条件;
③命题“若
,则
中至少有一个大于
”的否命题为“若
,则
都不大于
”.
其中错误的个数是( )
①命题:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e4848e12d90125411fb07a7e524de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87249dcd658c64cfa152b4c164b27e4c.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850f6874ea501c6021573701b0294dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9707dcd2a38e5cb5fe8222ccacb3e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b9347ce52e9e771883bdef7a4cb589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
其中错误的个数是( )
A.0 | B.1 | C.2 | D.3 |
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【推荐2】若“
,使
”是假命题,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1664157b58309ab853306e9906896937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e7e80946d3fb0df16ac5f99500194a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】设
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8ea07ff6062d53b85c54ced8dc7341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482892ef12f40457ac8efaabaf01721b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f795ca6afdddf359edc2470b9247ccae.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】已知
,则a,b,c的大小关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c107a51b27ca48043b7b90391cfd358.png)
A.a>c>b | B.a>b>c | C.b>a>c | D.c>b>a |
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