1 . 给出下列四个命题:①“若
,则a>b”的逆命题;②“
,使得
”的否定;③已知函数
的图象向右平移
个单位长度后得到函数
的图象,“函数
为偶函数”的充要条件是“
”;④在
中,“
”是“
”的充分不必要条件.其中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cb4f9a54a37fa2cf503bc77eb67ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460e4a1178391ab692aa0af66b915b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e9f49332bd7f58d3efb1035109e520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbb60c8c689819d191bb1aebd622b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9146192606b1abda29b88e60542e70e.png)
A.②④ | B.①④ | C.③④ | D.②③ |
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2 . 已知原命题:“若x<-2,则
”,则逆命题,否命题,逆否命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb9bace43ea5e7cb4de694b1765e92b.png)
A.0 | B.1 | C.2 | D.3 |
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3 . 已知命题
:若
,则
,在命题
与其逆命题、否命题、逆否命题这四个命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2c6eb4744f332ee2bbf938f5e1c683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7554ce3846def06c3b1a24936c96eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
A.0 | B.2 | C.3 | D.4 |
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4 . 下列命题中的说法正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.命题“![]() ![]() ![]() |
C.“![]() ![]() ![]() ![]() |
D.命题“若空间向量![]() ![]() |
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5 . (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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6 . 下列判断错误的有( )
①命题“
,
”的否定是“
,
”
②命题“若
,则
”是真命题
③命题“若
,则函数
只有一个零点”的逆命题为真命题
④若
为奇函数,则对定义域内的任意
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e59f3f081ff3b00b3ab35377211561a.png)
①命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd2dea76acbb2d3fd7b0239f1b2dd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f71fe1c216e4fe18fcbd2c5a5ec082.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f028aa6e01673382353627c499d00aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c9f10038308258f981c903c54a3902.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a12e04dcaf2cde31b57e86a3b41f471.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570df03fef42aece12560212ba3a64e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e59f3f081ff3b00b3ab35377211561a.png)
A.3个 | B.2个 | C.1个 | D.0个 |
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