2012·四川自贡·三模
1 . 对于三次函数
,定义
是
的导函数
的导函数,若方程
有实数解
,则称点
为函数
的“拐点”,可以证明,任何三次函数都有“拐点”,任何三次函数都有对称中心,且“拐点”就是对称中心,请你根据这一结论判断下列命题:
①任意三次函数都关于点
对称:
②存在三次函数
有实数解
,点
为函数
的对称中心;
③存在三次函数有两个及两个以上的对称中心;
④若函数
,则: ![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/cbdd6b14556e4870b23f8c1dcfe4e3ad.png?resizew=373)
其中正确命题的序号为_____ (把所有正确命题的序号都填上).
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/21ac331a5b0e4b30b00b0bfc8770a14a.png?resizew=213)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/60cd76baa3484586a3fab13c0e7d75f7.png?resizew=41)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/ca5c67acb37e4344aca4776bfadbb516.png?resizew=61)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/9b22cb4ef676428f863b199d569eff7a.png?resizew=65)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/4aeca168313f4352a09e9371cf7fe4f8.png?resizew=67)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/bed6f27974b441c4901f45d1999f3071.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/4a1972c93ff74273a10d6e3a25e47433.png?resizew=75)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/ca5c67acb37e4344aca4776bfadbb516.png?resizew=61)
①任意三次函数都关于点
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/86f6c82c145b4959a4570a0ff352e9e1.png?resizew=104)
②存在三次函数
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/9263178288534479a8555ceebddfcf6e.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/bed6f27974b441c4901f45d1999f3071.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/4a1972c93ff74273a10d6e3a25e47433.png?resizew=75)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/ca5c67acb37e4344aca4776bfadbb516.png?resizew=61)
③存在三次函数有两个及两个以上的对称中心;
④若函数
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/6f90ab20b1234a0b8c61bb78c5026c69.png?resizew=155)
![](https://img.xkw.com/dksih/QBM/2013/6/7/1571240628027392/1571240633196544/STEM/cbdd6b14556e4870b23f8c1dcfe4e3ad.png?resizew=373)
其中正确命题的序号为
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9-10高三·福建漳州·期末
2 . 给出下列四个命题:
①抛物线
的焦点坐标为
.
②函数
在
上单调递减.
③对于任意实数
,有
,且
时,
,则
时,
.
④若命题
,使
,命题
,则命题“
”是真命题.
其中正确命题的序号为______________ .(把你认为正确的命题序号都填上)
①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b62a460aef3370ee84bae1bae947403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a19636395e024f3f99bcd436dd85dd.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3122d8d5d984b6488438fcfd4d3125e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3adb9ed6e85993172051f0aa8e03eae8.png)
③对于任意实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e0935bef57475636130d73a53a0fd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9c89d2cd1fb46b1e71ad10227c098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fe5cf30f6ae30a0c3abdcd56cdf33f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db053b743c6ecbf87eb04fd8041b4c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9728d4989ec38eed3f98fd0ab1abd798.png)
④若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee53862442f2c03abe4af095ecb6746c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf487bcad17e562acd2af561e0d37d14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4f132ff31c53270c6ab9c0488d14af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b48685414b0c1b187179132143c284.png)
其中正确命题的序号为
您最近一年使用:0次
名校
3 . 以下四个关于圆锥曲线的命题中:
①设A、B为两个定点,
为非零常数,
,则动点P的轨迹为双曲线;
②平面内到两定点距离之和等于常数的点的轨迹是椭圆
③若方程
表示焦点在x轴上的椭圆,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a30d1ca1489fb48d1f5a43c004c926.png)
④双曲线
与椭圆
有相同的焦点.
其中真命题的序号为________________ (写出所有真命题的序号).
①设A、B为两个定点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7a3544be6797ded92aa786853fec8d.png)
②平面内到两定点距离之和等于常数的点的轨迹是椭圆
③若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e3d4ce1e61016c6b971f79d85ef9586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a30d1ca1489fb48d1f5a43c004c926.png)
④双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d49e09b17b19d7c787e95bcf1e9731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b1ddc7d49161e0eb8cecdab16285d4.png)
其中真命题的序号为
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10-11高二·福建福州·期末
4 . 以下四个命题:
①
是函数
的极值点;
② 当
无限趋近于
时,
无限趋近于
;
③
是
的必要不充分条件,则
是
的充分不必要条件;
④在
中,“
”是“
”的必要不充分条件.
其中真命题的序号为_____ (写出所有真命题的序号)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2899fba91f6c9441a4eb514f0be7e3a.png)
② 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcd1c6b9feb56cf15b5f706e0a6735a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5040d31e784398842b04ed7dd0aacc10.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e26b38e357c7d985656ba7bb3c794a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c253e2d257e9d313c50dc7308b3739ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d236e7315396d77ee666880edd1bef49.png)
其中真命题的序号为
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名校
5 . ①一个命题的逆命题为真,它的否命题一定也为真:
②在
中,“
”是“
三个角成等差数列”的充要条件;
③
是
的充要条件;
④“
”是“
”的充分必要条件;
以上说法中,判断错误的有_______________ .
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c1e84aaa7e1b5c1283075b36c72fb5.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403b18b04a7de9e79384b602834d3faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e59402e777165471831d1b6d458584a1.png)
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91bcddc2ece6bcde9355e222e1cf9f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
以上说法中,判断错误的有
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6 . 下列说法中
①命题“已知
,若
,则
或
”是真命题;
②命题“若
,则
”的否命题为“若
,则
”;
③若
,则
;
④命题“
”的否定为“
”.
正确说法的序号是___________ .
①命题“已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34982de5d3f287cd570ea30eb46d185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be861d83cddb5fc8aa22f7f0f9415d6.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1c561b81538ea38deab13478911b89.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2292108bfdd8c5e83be13e85d4d057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24044551b3704214531eb0fb1ba41ce1.png)
正确说法的序号是
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名校
7 . 已知函数
(其中
,
)的图象关于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
成中心对称,且与点
相邻的一个最低点为
,则对于下列判断:
①直线
是函数
图象的一条对称轴;②函数
为偶函数;
③函数
与
的图象的所有交点的横坐标之和为
.
其中正确的判断是__________________ .(写出所有正确判断的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec89c3bc454d209007c2b29baeeb3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13378be06b6b01bcad1d261ff14e87cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5818b8f9460f5ba919650df0faef451e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9861bd873c6adb45dcb1aa3dc95f16cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb570ccf066121892fcd834a766551e.png)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a2ec02caf837c6e7e0b76dd9acc7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db222e6bfc2bdac8c9d02c42fb24c52e.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fcc2e089e494e44c48f5b9b7e334cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb054ae93b1b899e6873748e968dde9e.png)
其中正确的判断是
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