1 . 已知集合
是集合
的一个含有8个元素的子集.
(1)当
时,设
,(i)写出方程
的解
;(ii)若方程
至少有三组不同的解,写出k的所有可能取值;
(2)证明:对任意一个X,存在正整数k,使得方程
至少有三组不同的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4fe083c382ff344f36212631b2787a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c0414948e1bdab25e75a50efbc088.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d17243ce6e243e4f463c414de68d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f7339e7d3d711e1f738f1c1d61e3fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71896c05d453bb24a4e637e20ce29453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ae939a6bce31fe556a87737721354d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f093c9f09fb55bdce94f35d51656472.png)
(2)证明:对任意一个X,存在正整数k,使得方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ceb930cd38d5d3da101d1ca6065ae53.png)
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2 . 已知数表
中的项
互不相同,且满足下列条件:①
;②
.则称这样的数表
具有性质
.
(1)若数表
具有性质
,且
,写出所有满足条件的数表
,并求出
的值;
(2)对于具有性质
的数表
,当
取最大值时,求证:存在正整数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/647e52202e18fa269763df9933db6973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e3cb3f545929654a1197de7698b153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e002706ff896b1172db9a84e132ca787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5bd58d80ed7062213c8f5f3b87bc17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a29fef95ed54dcf5c653749f5e9d232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若数表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce9d40adaecd9741d39abc0b3690431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eba1bc1bfc3def75c03f2c473330af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce9d40adaecd9741d39abc0b3690431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891f611bbc4558380467c4b4016092a9.png)
(2)对于具有性质
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a29fef95ed54dcf5c653749f5e9d232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1f8d904832b90d93d8bf482bf210fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887e3ada737ca3af0aa44846dec91a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d42cc575e90606d0fda516f1023c213.png)
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2023-06-14更新
|
120次组卷
|
2卷引用:北京市第十九中学2022-2023学年高二下学期期中考试数学试题
3 . (1)已知
,
,若
,
,且
,用分析法证明:
;
(2)用反证法证明:若
为
上的增函数,当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec84404bbf6cf4a9d992e1760dcfdd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4cbc7b067862a3d9c6789b392fc068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a074019a75a26e8d6b9147731a29a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3714deaf4f727fc716c6bb47b984e42f.png)
(2)用反证法证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beed579fa1c3bd9924e178222b1dfc1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798d6c2e5eac9c1d8b044efd5081acf.png)
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4 . 用反证法证明命题:“若
,
能被
整除,那么
、
中至少有一个能被
整除”时,假设应为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a075ed2a80c8fe9d1917284e8e6793d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.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/5ca7d1107389675d32b56ec097464c14.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
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名校
5 . (1)已知x∈R,
,
,
,试用反证法证明a,b,c中至少有一个不小于1.
(2)复数
,则求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab560cdc1f2fff8483e64235774d2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512670a2a8ffebb9ca69d4b75ec16de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033e0d9d0fcdfde98da36c30556ce240.png)
(2)复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5660534ca9b11d00de13ebba1fcbce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea258c79acd4174d5b9cae181a6f55d.png)
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6 . (1)已知
,证明;若
,则
中至少有一个小于
;
(2)利用积分的几何意义求值(画出图).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb9b6fe8959ae9e71e857b6d6fed49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63381c4b8fb5ecfd04af2808a99dca46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(2)利用积分的几何意义求值(画出图).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619ab152b286b94e0f0f72a58a3352b6.png)
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7 . 用反证法证明命题时,对结论:“自然数a,b,c中至少有一个是奇数”正确的假设为( )
A.a,b,c都是偶数 |
B.a,b,c都是奇数 |
C.a,b,c中至少有两个奇数 |
D.a,b,c中至少有两个偶数或都是奇数 |
您最近一年使用:0次
2023-06-20更新
|
131次组卷
|
2卷引用:陕西省宝鸡教育联盟2022-2023学年高二下学期6月联考文科数学试题
名校
8 . 已知
为有穷数列.若对任意的
,都有
(规定
),则称
具有性质
.设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c38cc7f201fede1860f9fe987ff01e.png)
(1)判断数列
,
是否具有性质
?若具有性质
,写出对应的集合
;
(2)若
具有性质
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519e46609069838b08721bdd8fd7fa6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a427d86ca98786e25d636f58129831cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7e9edf6d0468e0f8ca78b8bac63bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b740bc48c9718a294c11a1485fd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c38cc7f201fede1860f9fe987ff01e.png)
(1)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4811d7682bd33251b78071ba9ccc66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6bdcbd453ca29c88f9920aa0d15ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed1adc648cc7d8fe7ac43df4b918f11.png)
您最近一年使用:0次
2023-05-20更新
|
197次组卷
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2卷引用:北京市昌平区前锋学校2022-2023学年高二下学期期中考试数学试题
名校
9 . 已知
∈(0,+∞),
若
求证:
中至少有一个数不大于1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2f928fe46365cfb7cb905a12d0583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77727464637f7e5ca2528c2450c4c08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
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10 . 用反证法证明:
是无理数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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