(1)写出不等式
等号成立的一个充要条件是______ ,一个充分非必要条件是______ ,一个必要非充分条件是______ ;
(2)写出不等式
等号成立的一个充要条件是______ ;
(3)写出不等式
等号成立的一个充要条件是______ ;
(4)写出不等式
等号成立的一个充要条件是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17dfe017b47a6c698367a734178ad318.png)
(2)写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15638f1e66350b1341d7a123f438079d.png)
(3)写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c7dc7fede94988efae9af48562ab65.png)
(4)写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae8a569e980980633d59b7b6de9dc18.png)
更新时间:2021-12-25 22:55:40
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【推荐1】命题
:
,
为真命题的一个充分条件是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14fbe7cfe9b2d5cdb95a3838aa0e64de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e0ab297d1bcb8f32e09dd0f5d5ad0b.png)
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【推荐2】已知函数
,则“b<0”是“
的最小值与
的最小值相等”的________ 条件(从“充分不必要”“必要不充分”“充要”“既不充分也不必要”中选填一个).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc44805992bb47abfb4c4f98ae5a426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6040429c3c51bf752cce76cddb42a5e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672f564d03ed46d092bb130f229ad8.png)
您最近一年使用:0次
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【推荐1】现有下列四个结论,其中所有正确结论的编号是______ .
①若
,则
的最大值为
;
②若
,
,
是等差数列
的前3项,则
;
③“
”的一个必要不充分条件是“
”;
④若
且
,则
.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca542e78b7d77d008c9c4752afa91a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10197f1c78f3a9c8f37d00b1b5e8b076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da34d65ffac54b89d63ffbb2393b4d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008e77135f850cd4beab452480a591d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94919d8c37d0032353b8f83199fbbcdf.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2108d2ca58216bc0733970cfd7b5ad29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a712b1c0eda0a862e96fdacca23e208.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec8cb29e099dbb00eee7f61b4adee16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b305e0acc291e36433060138d53d903e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/116743430180d306fece50a4f1d2a2ff.png)
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解题方法
【推荐2】已知直线
,
,平面
,
,满足
且
,则“
”是“
”的___________ 条件.
![](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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08666162eebf18ddcc96288bc3854f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057cdb4057bca398a838e868efd360f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526985744fe472beef406c56b531ef85.png)
您最近一年使用:0次
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解题方法
【推荐3】给出下列命题:
①命题“所有的正方形都是矩形”的否定是“所有的正方形都不是矩形”;
②设
为简单命题,则“
”为假是“
”为假的必要而不充分条件;
③函数
的极小值为
,极大值为
;
④双曲线的渐近线方程是
,则该双曲线的离心率是
.
⑤等差数列
中首项为
,则数列
为等比数列;
其中真命题的序号为 (写出所有真命题的序号)
①命题“所有的正方形都是矩形”的否定是“所有的正方形都不是矩形”;
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18fbac3b04744429a839e1cd0a9da704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54b6a060d6c51a328341df76013bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e1a1611f320c0f358df77aaae3f942.png)
④双曲线的渐近线方程是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0f4b0890e4659c9cf8bcbb5dcf9ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
⑤等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4844ada5b5eb39d704345bb4e6080d99.png)
其中真命题的序号为 (写出所有真命题的序号)
您最近一年使用:0次
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【推荐1】已知二次函数
,则“
与
有相同的零点”是“
”的______ 条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d7ed6f4b0e08cd887d2fdc2a5e37e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276b142a9d9f0a87425a668dd6501f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a783088120d67cc98936081e80fb7f.png)
您最近一年使用:0次
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解题方法
【推荐2】
,
为不共线的向量,设条件
;条件
对一切
,不等式
恒成立.则
是
的__________ 条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7773ca6699f20b3e158f6df10045f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6196de2008aef22c3cd85ec7e1bb64ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561f2ae238beeffe82bb4cd5643fc8f0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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