名校
1 . 已知
均为正数,并且
,给出下列2个结论:
①
中小于1的数最多只有一个;
②
中最小的数不小于
.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1a2f40c3c0853c0d5a4150a9d3fc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d6194de86fc1fdaa85646c25cbc67a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1a2f40c3c0853c0d5a4150a9d3fc80.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1a2f40c3c0853c0d5a4150a9d3fc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca83504e351d7516f61a3052d7a31859.png)
A.①对,②错 | B.①错,②对 |
C.①,②都错 | D.①,②都对 |
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2卷引用:上海市浦东新区南汇中学2024届高三上学期12月月考数学试题
名校
2 . 如果
同时满足以下三个条件:
①
;②对任意
,
成立;③当
,
,
时,总有
成立,则称
为“理想函数”.有下列两个命题:
命题
:若
为“理想函数”,则存在
且
,使
成立;
命题
:若
为“理想函数”,则对任意
,都有
成立.
则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf2489be061d0834df02c319a798e33.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249a976e88133f3b3733f09137cf5c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12aae852c3129efc16934aefc54201f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cd2fe62ffe3caa1c6f7976851c9dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2f51cd760aeff9365b51e9a85b41e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f6988640a0b9bc4f9637132e6ca470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a6c0fddb9074dfc96be03b4aa24d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca3ecbbaca8eeb1cfa8f4035f7d5726.png)
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d3c756a52c9185ae6d02d9b9312f29.png)
则下列说法正确的是( )
A.命题![]() ![]() | B.命题![]() ![]() |
C.命题![]() ![]() | D.命题![]() ![]() |
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3 . 应用反证法推出矛盾的推导过程中,要把下列哪些作为条件使用( )
(1)结论的否定;(2)已知条件;(3)公理、定理、定义等;(4)原结论.
(1)结论的否定;(2)已知条件;(3)公理、定理、定义等;(4)原结论.
A.(1)(2) | B.(2)(3) | C.(1)(2)(3) | D.(1)(2)(4) |
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4 . 对于问题“设实数
满足
,证明:
,
,
中至少有一个不超过
”.甲、乙、丙三个同学都用反证法来证明,他们的解题思路分别如下:
甲同学:假设对于满足
的任意实数
,
,
,
都大于
.
再找出一组满足
但与“
,
,
都大于
”矛盾的
,从而证明原命题.
乙同学:假设存在满足
的实数
,
,
,
都大于
.
再证明所有满足
的
均与“
,
,
都大于
”矛盾,从而证明原命题.
丙同学:假设存在满足
的实数
,
,
,
都大于
.
再证明所有满足
的
均与“
,
,
都大于
”矛盾,从而证明原命题.那么,下列正确的选项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
甲同学:假设对于满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
再找出一组满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
乙同学:假设存在满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
再证明所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
丙同学:假设存在满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dad69e399b3b4f68b777f6678c7ced7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
再证明所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dad69e399b3b4f68b777f6678c7ced7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
A.只有甲同学的解题思路正确 | B.只有乙同学的解题思路正确 |
C.只有丙同学的解题思路正确 | D.有两位同学的解题思路都正确 |
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2卷引用:上海市浦东复旦附中分校2022-2023学年高一上学期10月月考数学试题
名校
5 . 用反证法证明命题“若
,则a,b中至少有一个不为0”成立时,假设正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
A.a,b中至少有一个为0 | B.a,b中至多有一个不为0 |
C.a,b都不为0 | D.a,b都为0 |
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4卷引用:上海市建平中学2023届高三上学期9月月考数学试题
名校
6 . 用反证法证明:“
、
、
、
,
,
,且
,则
、
、
、
中至少有一个负数”时的假设为( )
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b33ff8346b233bd4721e7c1b67488e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e45d86a588481216a06cb446f78d766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a08f4e12d723ec259c98b44c5aa1d4a1.png)
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
A.![]() ![]() ![]() ![]() | B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() | D.![]() ![]() ![]() ![]() ![]() |
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7 . 如图,在矩形
中,
,
,
、
分别为边
、
的中点,沿
将
折起,点
折至
处(
与
不重合),若
,
分别为线段
、
的中点,则在
折起过程中,下列选项正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/9/9/3062777936781312/3066195086860288/STEM/d2315b43b23d40649b97fcc4761edba1.png?resizew=259)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df21b7b7a47318ef2bb069450c39f1cd.png)
![](https://img.xkw.com/dksih/QBM/2022/9/9/3062777936781312/3066195086860288/STEM/d2315b43b23d40649b97fcc4761edba1.png?resizew=259)
A.![]() ![]() |
B.不能同时做到![]() ![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.直线![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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9卷引用:上海市洋泾中学2020-2021学年高二下学期3月月考数学试题
上海市洋泾中学2020-2021学年高二下学期3月月考数学试题上海市洋泾中学2021-2022学年高二上学期10月月考数学试题浙江省金华十校2019-2020学年高二上学期期末考试数学试题(已下线)理科数学-2020年高考押题预测卷03(新课标Ⅰ卷)《2020年高考押题预测卷》浙江省宁波市金兰教育合作组织2020-2021学年高二上学期期中联考数学试题广东省佛山市第一中学2020-2021学年高二(重点班)上学期第一次段考数学试题(已下线)第01讲 空间直线与平面(核心考点讲与练)(2)(已下线)数学(上海B卷)(已下线)10.4 平面与平面平行(第1课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020必修第三册)
名校
解题方法
8 . 下列不等式判断正确的有( )
(1)
;
(2)
;
(3)若
,则
;
(4)若
,则
;
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f012723166468ee405091aff20a6c05.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e392473aa00fae75dc92c2ccb697a0cd.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b419e7d63d2eee9c23c393210dfa6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e15c8237494322d425cedcb29b5e9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.(1)(3) | B.(2)(3) |
C.(2)(4) | D.(2)(3)(4) |
您最近一年使用:0次
名校
9 . 设a,b,c均为正数,则
,
,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f8122ee10aa2122a91e08d8d6d350d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75211eb335491ac5bf72459a80b5728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eecded67415b0848f3c23c1a8e2f741.png)
A.都不大于6 | B.都不小于6 |
C.至多有一个不大于6 | D.至少有一个不小于6 |
您最近一年使用:0次
2022-03-24更新
|
749次组卷
|
10卷引用:上海市进才中学2023-2024学年高一上学期期中数学试题
上海市进才中学2023-2024学年高一上学期期中数学试题安徽省六安市第一中学2018-2019学年高二下学期第一次段考数学(理)试题陕西省榆林市第十二中学2020-2021学年高二下学期第一次月考理科数学试题河南省2021-2022学年高二下学期联考(二)文科数学试卷河南省2021-2022学年高二下学期联考(二)理科数学试题河南省中原好教育联盟2021-2022学年高二下学期第二次联考数学理科试题河南省中原好教育联盟2021-2022学年高二下学期第二次大联考文科数学试题江西省抚州市七校2021-2022学年高二下学期期末考试数学(理)试题江西省抚州市七校2021-2022学年高二下学期期末考试科数学(文)试题陕西省延安市第一中学2021-2022学年高二下学期期中文科数学试题
名校
10 . 用反证法证明“若a,b∈R,
,则a,b不全为0”时,假设正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
A.a,b中只有一个为0 | B.a,b至少一个不为0 |
C.a,b至少有一个为0 | D.a,b全为0 |
您最近一年使用:0次
2021-04-27更新
|
980次组卷
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8卷引用:上海市浦东新区2023-2024学年高一上学期期中数学试题
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