命题“若
且
,则
.”的否命题是_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52199fada2706f6071ab94409f89c840.png)
更新时间:2020-01-10 22:28:47
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填空题-单空题
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较易
(0.85)
【推荐1】给定下列命题:
①若
,则方程
有实数根;
②“若
,则
”的否命题;
③“矩形的对角线相等”的逆命题;
④“若
,则
中至少有一个为0”的否命题;
⑤“若
或
,则
”.
其中真命题的序号是_________ .
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abea6224022b1908702d845fb4759f6.png)
②“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eef30a1357d8d8b6a2de0cd4e960e9.png)
③“矩形的对角线相等”的逆命题;
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
⑤“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe436ba908c76027255f3a677bf0657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b943869e5c96a5c7c79774f7a9bbd3.png)
其中真命题的序号是
您最近一年使用:0次
填空题-单空题
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较易
(0.85)
【推荐2】命题“若
,则
且
”的否命题为______________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8635af7bc505301a16eb3bbccdc86e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc335ee14fc0b1130900cb82bcb3061.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐1】用适当的逻辑连接词填空:(1)若
,则
;
(2)若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb20e291772c2614ad19f4cc919dfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3019b662e5dc2750bb6f9199d3250f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐2】在一次跳伞训练中,甲、乙两位学员各跳一次.设命题
是“甲降落在指定范围”,
是“乙降落在指定范围”,则命题“至少有一位学员没有降落在指定范围”可表示为________ .
①
;②
;③
;④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df555956505b2a9ac2fbc061adcff221.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd81dfe9e69cb19a3b51f2a945b8ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2431aa4b275bf0478bb944e90e18a1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
您最近一年使用:0次