名校
1 . 下列命题中错误 的是( )
A.当![]() ![]() |
B.若实数x,y满足![]() ![]() |
C.对任意![]() ![]() |
D.对任意![]() ![]() |
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2 . 若对任意
,都有
成立,则
的值可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117ddce61379e226df0f97a9c9388029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb6b97113ea218382acc38021564398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.1 | D.2 |
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解题方法
3 . 已知
,那么,当代数式
取最小值时,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70532fd9189082637db2ec20bdd99b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219ba6c8a1b54598db1a78cab28d9d30.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 设
为全集,
、
为非空集合,下面四个条件,其中是
的充要条件个数有( )个
(1)
;(2)
;(3)
;(4)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.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/c2ad78dc8b8aed907b4fe9640c997454.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ceb1f338fa60976229d7ec6531b626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9d50619b779c1056602f46b2a95e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e146e222505f9166f30b595150e27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c408d812ff6ed28bb6217b8b37c947a9.png)
A.1 | B.2 | C.3 | D.4 |
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5 . 已知
,函数
在区间
上最小值为
,在区间
上的最小值为
变化时,下列不可能的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3162d2c7b650bba3e401ffbb1e13bb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98341cb103fbefd69155523f550b046f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb50b7018212981accd8a8023df51de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02ed2127693ea75aa7e1fe1e1aa06eb.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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解题方法
6 . 已知
,
,
,则
的大小关系是(参考数据
,
)( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cec8cb64b526ff46257f00cc09da9a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8992d2c2febb7d8acd3464ab295b6883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f919f4ffa0372c891f9ecde7e407d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfb5a9ba77ae3ff13997225d5ba02f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70345587c2d90c50abb161cd7e158a67.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 若实数
、
满足
,下列不等式中恒成立的是( )
![](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/2d100c22435a23e017cfe6f535379d3c.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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8 . “
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b872c4ba5d419b16a164150fd99e9035.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e189dbc979fad6bf8ca03ac1388cbac0.png)
A.充分非必要条件 | B.必要非充分条件 |
C.充要条件 | D.既非充分也非必要条件 |
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解题方法
9 . 下列说法正确的是( )
A.若![]() | B.![]() |
C.设![]() | D.周长为10的所有矩形中,面积最大的为25 |
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10 . 设条件
,条件
,则条件
是条件
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfdce76e4d2c1a7c3b4079d2e65cc10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464ae0d5aa918bd3701ed788b31c6db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.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 |
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