名校
解题方法
1 . 对下列命题:
(1)若命题
,则命题![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed598e8d3f64d994c6be400a01f8e29.png)
(2)
的最小值为4;
(3)
是各项均为正数的等比数列,则
是等差数列;
(4)
,且
是锐角,则实数的取值范围为
;
其中所有正确命题的序号为___________ (填出所有正确命题的序号).
(1)若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97848955a36d41def3a1c31115cb93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed598e8d3f64d994c6be400a01f8e29.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92764eb4fd255796e92c2c4db5909efc.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc71a2fd8c6b263feea5ff5d6a36121.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b5d531efd6be7ffc145c9c6597afab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaf8279481e31e730f866dd047f9224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a891eb0f07654c6dda4380b2fae38e8a.png)
其中所有正确命题的序号为
您最近一年使用:0次
2 . 已知曲线F(x,y)=0关于x轴、y轴和直线y=x均对称,设集合S={(x,y)|F(x,y)=0,x∈Z,y∈Z}.下列命题:
①若(1,2)∈S,则(-2,-1)∈S;
②若(0,2)∈S,则S中至少有4个元素;
③S中元素的个数一定为偶数;
④若{(x,y)|y2=4x,x∈Z,y∈Z}⊆S,则{(x,y)|x2=-4y,x∈Z,y∈Z}⊆S.
其中正确命题的序号为______ .(写出所有正确命题的序号)
①若(1,2)∈S,则(-2,-1)∈S;
②若(0,2)∈S,则S中至少有4个元素;
③S中元素的个数一定为偶数;
④若{(x,y)|y2=4x,x∈Z,y∈Z}⊆S,则{(x,y)|x2=-4y,x∈Z,y∈Z}⊆S.
其中正确命题的序号为
您最近一年使用:0次
2019-04-26更新
|
573次组卷
|
3卷引用:重庆市第一中学2018-2019学年高二下学期期末数学(理)试题
3 . 给出下列命题:
用反证法证明命题“设a,b,c为实数,且
,
,则
,
,
”时,要给出的假设是:a,b,c都不是正数;
若函数
在
处取得极大值,则
或
;
用数学归纳法证明
,在验证
成立时,不等式的左边是
;
数列
的前n项和
,则
是数列
为等比数列的充要条件;
上述命题中,所有正确命题的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee08def7a24d4255453ad40a77cd4e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd92e0bbdc7a5fd3d604160cf4306ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae018fde08edf0539089f98c17e11ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19bce4c604450307f40dcbd6a9ca6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d0ce4e36a37c22267c03b54bd5ba3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f8c4d135ae1aa3911dec9d086b489d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2600a54b7bf3f79aaec7d49a47f6b4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36a91b78ea833d5b09c11366324a845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67312d6fbde2db992b25a11f4ec102b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/052c6cf4517966ecebd39354490b1723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c9d7f7f9a3e9ec476f5cf7fda97c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb989bea4883060e495e03e709593361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8b8edd94bc4d5d517ec77e56800e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f13167b6a291eeb91bd9a796745f6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d493ee368a6be6e8de57368520c8cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
上述命题中,所有正确命题的序号为
您最近一年使用:0次