1 . 集合
,集合
,若集合
中元素个数为
,且所有元素从小到大排列后是等差数列,则称集合
为“好集合”.
(1)判断集合
是否为“好集合”;
(2)若集合
是“好集合”,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5578681bed3f7e22b91cfc962045be26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e22e3abe1a2ef8554b4f0f828e4e70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d00b592b51981ec491c1a1275593143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(1)判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db050d01622e491d82b2e809bfc634bc.png)
(2)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90d2e374073f702dbaaa29f34815fd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
名校
解题方法
2 . 已知集合![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3084dfcb38b6c1a46381be313400dbf.png)
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3084dfcb38b6c1a46381be313400dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33050456e2763c9a0386d118b40eafc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 设
为正整数,集合
对于
,设集合
.
(1)若
,写出集合
;
(2)若
,且
满足
令
,求证:
;
(3)若
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb39983c5c3fc32d3f0a2c98f04cdb3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee7981aba05ee1d4945062913c8db8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08897069d8b3e4c9f42a768d7ae2d416.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40deecdcc73cfee7fe7624a813af16ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeff5c5f7214a5f9b920af89af5b3802.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee7981aba05ee1d4945062913c8db8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c5c31ea128ff2a390979894f53486f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695e27822adf2901dd6f48a1a29e68d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764928f3bec8c40cbff944c0b36ffb57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bf5b3e05fdd0bdb9597f5b9d2386cf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee7981aba05ee1d4945062913c8db8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53037f80f8cf5faf2f861a3859c3166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa4b0e70b5c191c6391263d905c52b0.png)
您最近一年使用:0次
4 . 已知等差数列
的前
项和为
,则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9af5783b85caabe061d2ca6232be2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744b5f5c09246fe3a618539b313aa4c5.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
5 . 已知集合
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6396e8ffd180386f9e45532e9937ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b294af6c6bb9f1f8640927cc55b05b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/869c78c84a182dae3f2911903cd9347f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdeeffcab2ab366406d7dac60f84f1c0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 已知整数
,集合
,
,
,满足
,对任意的
,都有
且
.记
.
(1)若
,写出两组满足条件的集合
,
并写出相应的
;
(2)证明:
;
(3)求
的所有可能取值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652fd852e080c91df90888d0449d63d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea7fcdb5423c1c8c032a3efcf245682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c7bb58dca886fc65d874e2b30040c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f906607b8f6606742f496f73fff2ffd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937c09d82c480e4d67f8a48d3f66c5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431acf301f0cf1e414b532de94708474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd31439e275791f4fcd3d22b5ae30ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab4a9bfa50054c808dd8190305d0abd.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4a2681390214200443ae07c01a4abe.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607a272bff596f86f25dd99f5a69fbbe.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4a2681390214200443ae07c01a4abe.png)
您最近一年使用:0次
名校
7 . 已知
是公比为
的等比数列.则“
,
恒成立”是“
是
的一个最值”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fde3541708c770e48a06c28f9a3434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12d0bd9afdd4e53ff37f5bfcaa1106c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c57177e14cdf8c2c932fe49ca63ed29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.即不充分也不必要条件 |
您最近一年使用:0次
名校
8 . 设集合
,
,则集合
的元素的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d964fc7505cd0c2608d43bcc04cd56ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb94b755a944515003a9fb1420816d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
解题方法
9 . 已知平面向量
,
,
,
是单位向量,且
,则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ccfda9afde4441cfd1d4df5fe9622d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5770837fe8c7fc7d53ce7f19414c94f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a3f5738c22b6b5b7f9b97151c13fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2325ac52b093b75b592b178940c610e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7bc18368778c1a6241e00ec88b47c4e.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
10 . 已知
.则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095cb2a85722a74683f88614d4090cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea134f599285e3d32d2ab3e7186990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2028b937b9d41557a557224640c063.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次