1 . 设
是
次实系数多项式,其中
.证明:若
的
个根都是实数,则
的
个根也都是实数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9e5589a6d48029648a357b7d233bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2 . 在
中,
是
外一动点,满足
,设
,则下列结论正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/c7b0f670-66c4-4872-afbe-6e518519b4e0.png?resizew=127)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5cb0c151c65b03e17996dbc13c29000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a8cb4c14a70137ab4ebc08e1e40568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4a41cf2b61cb7dd54ba549a549694b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/c7b0f670-66c4-4872-afbe-6e518519b4e0.png?resizew=127)
A.![]() |
B.设四边形![]() ![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() |
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3 . 在
中,
是
中点,
是射线
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/81a83048-546d-475e-8ec7-7ac6de245317.png?resizew=369)
(1)如图1,连接
并延长交
于点
,求
的值;
(2)如图2,
交
于点
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/81a83048-546d-475e-8ec7-7ac6de245317.png?resizew=369)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00e7e28f754e518812e746b9be245da.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa73b8b8f7a9ed8d505b81eb7b3f521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856ddcafb0a8610ed9a95eff0f41e6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d4d78dce0cf121e288749e58b1924d.png)
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4 . 若关于
的一元二次方程
有两个不相等的实数根
,且
.
(1)下列说法正确的有__________ .(将正确选项的序号填在横线上)
①若
,则
,
②
,
③若
,则
,
④若
,则
.
(2)某数学兴趣小组为了增加此题的趣味性,将题目改成:若关于
的方程
有两个不相等的实数根
,且
,其中
均为整数,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b800b7d6a688abf8a3018c133cec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca579894dad67bc82cb715fd48e0d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5ffa21fddc7c55d35f13435792b2d4.png)
(1)下列说法正确的有
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fe3251e054fe97089806ba7033f802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badd7f3edb52106b897fe62c9e9ada2e.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d57bdb85ad21a427ebc3126fab41ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c56b1ee18c6809b339d980671b4d09a.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a066bbbcf164565325c66d9e5f500d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc1adacd10539c74b82fc1e6e88ea6f6.png)
(2)某数学兴趣小组为了增加此题的趣味性,将题目改成:若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9c0dce1f975d1203a1bff7580a892d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097f28b6443848c98413364953c37ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
5 . 俄国数学家切比雪夫(П.Л.Чебышев,1821-1894)是研究直线逼近函数理论的先驱.对定义在非空集合
上的函数
,以及函数
,切比雪夫将函数
,
的最大值称为函数
与
的“偏差”.
(1)若
,
,求函数
与
的“偏差”;
(2)若
,
,求实数
,使得函数
与
的“偏差”取得最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefd4b8569af51ff09803173f4e317d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefb4b25c31f33f979610ae52c79960c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bb6324279df94decba955e04ccfa9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9642df8f7f47962daeab61e8874a135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacc9308da40e8852e9c00db0eb1391a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6dbdc6df07aaa13b26b250f314f4c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5c448025ea7b5e428a7344e1ecd31b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
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2023-02-26更新
|
1258次组卷
|
4卷引用:广西2021-2022学年高二上学期12月高中学业水平考试数学试题
广西2021-2022学年高二上学期12月高中学业水平考试数学试题(已下线)第二篇 函数与导数专题5 切比雪夫、帕德逼近 微点2 切比雪夫多项式与切比雪夫逼近重庆市2023届高三下学期3月月度质量检测数学试题专题03E函数解答题
名校
6 . 对于函数
,
,设区间
是
上的一个子集,对于区间
上任意的
,
,
,当
时,如果总有
,则称函数
是区间
上的
函数.
(1)判断下列函数是否是定义域上的
函数:①
,②
;
(2)已知定义域上的严格增函数
也是定义域上的
函数,试问:
是否是定义域上的
函数?若是,请给出证明;若不是,请说明理由;
(3)若函数
为区间
上的
函数,证明:对于任意的
,
和任意的
,总有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1310a7a80d1f8751a3f8cafe7f8c8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c86dd7dc05984b4e54d5f91d60f21d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(1)判断下列函数是否是定义域上的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
(2)已知定义域上的严格增函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135bcf6d7f7c04641823b90f1d038eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad7d1d5b0d1d62c83386d87825f789e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb6bf23a5a12e1ba5413594d7b1a57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4f386c18fb52c1d57b532d138bc74e.png)
您最近一年使用:0次
2022-12-18更新
|
882次组卷
|
4卷引用:上海市进才中学2021-2022学年高一上学期期末数学试题
上海市进才中学2021-2022学年高一上学期期末数学试题(已下线)上海高二下学期期末真题精选(压轴60题35个考点专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)辽宁省大连市第二十四中学2023届高三高考适应性测试(一)数学试题(已下线)必修第一册综合检测-人教A版(2019)必修第一册单元测试能力卷
解题方法
7 . 已知数列
,
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3819d72974cc2440af9a448e5076246a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794dd235c980222337d01626c96371f9.png)
A.对任意的![]() ![]() ![]() |
B.对任意的![]() ![]() ![]() |
C.对任意的![]() ![]() ![]() |
D.对任意的![]() ![]() ![]() |
您最近一年使用:0次
2022-01-03更新
|
1140次组卷
|
5卷引用:浙江省绍兴市诸暨市海亮高级中学2021-2022学年高三上学期12月选考数学试题
浙江省绍兴市诸暨市海亮高级中学2021-2022学年高三上学期12月选考数学试题浙江省绍兴市诸暨市海亮高级中学2022届高三下学期高考前最后一卷数学试题(已下线)专题6-1 数列函数性质与不等式放缩(讲+练)-2(已下线)专题9 周期数列 微点2 周期数列的“脸谱”识别(已下线)第4章 数列 章末题型归纳总结(3)
2021·全国·模拟预测
名校
解题方法
8 . 勒洛四面体是一个非常神奇的“四面体”,它能在两个平行平面间自由转动,并且始终保持与两平面都接触,因此它能像球一样来回滚动.勒洛四面体是以正四面体的四个顶点为球心,以正四面体的棱长为半径的四个球的公共部分,如图所示,若正四面体ABCD的棱长为a,则( )
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883682229657600/2883819415379968/STEM/756fda5a057a492a92545f459609667f.png?resizew=220)
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883682229657600/2883819415379968/STEM/756fda5a057a492a92545f459609667f.png?resizew=220)
A.能够容纳勒洛四面体的正方体的棱长的最大值为a |
B.勒洛四面体能够容纳的最大球的半径为![]() |
C.勒洛四面体的截面面积的最大值为![]() |
D.勒洛四面体的体积![]() |
您最近一年使用:0次
2021-12-30更新
|
3190次组卷
|
9卷引用:2022年全国高中名校名师原创预测卷(五)
(已下线)2022年全国高中名校名师原创预测卷(五)(已下线)解密11 空间几何体(讲义)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(新高考专用) 湖南省长沙市雅礼中学等十六校2022届高三下学期第二次联考数学试题2022届高三下学期“最后一卷”系列联考(新高考Ⅰ卷)数学试题重庆市第八中学校2022-2023学年高三上学期期中学情检验数学试题黑龙江省大庆市大庆铁人中学2022-2023学年高三上学期期末数学试题(已下线)第25讲 圆柱、圆锥、圆台、球的表面积和体积 2河南省济源市济源第一中学2024届高三上学期期中数学试题山东省济南市章丘区第一中学2024届高三上学期12月阶段测试数学试题
2021·全国·模拟预测
名校
9 . 已知函数
(
)有两个不同的极值点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8923affba77d55b330a58dd208d84b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
A.若![]() ![]() ![]() |
B.函数![]() ![]() |
C.实数a的取值范围为![]() |
D.若函数![]() ![]() ![]() |
您最近一年使用:0次
解题方法
10 . 已知函数
,其中
.求证:
(1)
,且
;
(2)
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4d6363133c710c00b99fafa01dce16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1948bdb9bfc6493bc0e596d9a0dab5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accad8245514b083d7434160085188fd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9f295a43c5d78cf9518456fef0abda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32474ff2d16bb427dc7426e481b20709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2479b7fa52eafe0e011435864bfe9c37.png)
您最近一年使用:0次