已知命题p:“若
,则
且
”.则命题p,命题p的逆命题、否命题.逆否命题,这4个命题中真命题的个数为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e678db71585b1ebec7c53cb22080e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
更新时间:2020-04-30 21:23:17
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填空题-单空题
|
适中
(0.65)
名校
【推荐1】给出下列命题:
①函数
是偶函数;
②方程
是函数
的图象的一条对称轴方程;
③若
、
是第一象限角,且
,则
;
④设
,
是关于
的方程
(
,
,
)的两根,则
;
其中正确命题的序号是__________ .(天厨所有正确命题的序号)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b1b148e4b89d27a8c7d64c0b8179aa.png)
②方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e60b49815c5c25b48e6c74d7077851a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d551a24bc5a4415482e5b4322350f82.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c61cfbfd3bf888856b7dc9b2a84c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/116a4f1c8b51d1993e6d7c054e2ed5d7.png)
④设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaeea6ddf29b8e49a74b911f045b0d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d900314efb0e4cacb6e5de945b5397.png)
其中正确命题的序号是
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】给出下列四个命题:
①“若
,则
”的逆命题;
②“若数列
是等比数列,则
”的否命题;
③“若
,则关于
的方程
有实根”的逆命题;
④“若
,则
”的逆否命题.
其中假命题是___________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5ac0e36502919c76bccf50b1c8735b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f68247f245829af04a4aa58820d57e.png)
②“若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be02544e0fb9b80e2ce723bcc697da93.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56485f5459cbead897ee5f874f249c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e232f45482195a9500e067fe9f970af0.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ceb1f338fa60976229d7ec6531b626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf22d7d1a965bda25168a233fb6290c.png)
其中假命题是
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐1】若命题“
是关于
的不等式
的一个解”的逆否命题是真命题,则实数
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a42fe15ffb9f35e96d3922cfb7646e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
填空题-单空题
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适中
(0.65)
【推荐2】下列四个命题:
①一个命题的逆命题为真,则它的否命题一定为真;
②等差数列
中,
,
,
,
成等比数列,则公差为
;
③已知
,
,
,则
的最小值为
;
④在
中,若
,则
为锐角三角形.
其中正确命题的序号是_____________ .(把你认为正确命题的序号都填上)
①一个命题的逆命题为真,则它的否命题一定为真;
②等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf35d6c316d9a014327ed3fdfeec374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3df1ec9f4cc08c367980b39a931785.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336bbf462ae13b146976ef65a58a5969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
其中正确命题的序号是
您最近一年使用:0次