1 . 规定:对于
,当且仅当
时,
. 则
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c77bbbde6d4e3a801c6f189d6d6d434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8523e94a49d5af23c70d21d0181b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1545c7aec0992dbd22e94d9a72da718.png)
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2018-10-05更新
|
656次组卷
|
3卷引用:2016年全国高中数学联赛湖南赛区预赛试题
11-12高二下·辽宁盘锦·阶段练习
真题
名校
2 . 一个均匀小正方体的六个面中,三个面上标有数字0,两个面上标有数字1,一个面上标有数字2.将这个小正方体抛掷2次,则向上的数之积的数学期望是________ .
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2020-08-28更新
|
343次组卷
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16卷引用:2016年全国高中数学联赛湖南赛区预赛试题
2016年全国高中数学联赛湖南赛区预赛试题2015-2016学年西藏林芝市高二下学期期末数学(理)试卷(已下线)10-9 离散型随机变量的均值与方差(高效训练)-2019版导学教程一轮复习数学(人教版)智能测评与辅导[理]-随机变量及其分布列(1)考点20 随机变量及其分布-2020年【衔接教材·暑假作业】新高三一轮复习数学(理)(人教版)2006年普通高等学校招生考试数学(理)试题(福建卷)(已下线)2011-2012学年辽宁盘锦二中高二下学期月考理科数学试卷高中数学人教A版选修2-3 第二章 随机变量及其分布 2.3.1 离散型随机变量的均值 (1)2018年秋人教B版选修2-3单元测试:模块综合检测2018-2019学年北师大版高中数学选修2-3同步配套(课件+练习):2.5.1【全国百强校】贵州省思南中学2018-2019学年高二下学期第二次月考数学(理)试题辽宁省阜新市第二高级中学2019-2020学年高二下学期第一次月考数学试题吉林省汪清县第六中学2019-2020学年高二6月月考数学(理)试题(已下线)突破2.3离散型随机变量的均值与方差突破满分数学之2019-2020学年高二数学(理)课时训练(人教A版选修2-3)人教B版(2019) 选修第二册 过关检测 第四章 4.2.4 随机变量的数字特征 课时1人教A版(2019) 选修第三册 一蹴而就 第七章 单元测试
3 . 给定平面向量(1,1).则平面向量
是将向量(1,1)经过( )变换得到的.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e11c714bda7ad109848456e0e4a064.png)
A.顺时针旋转60° |
B.顺时针旋转120° |
C.逆时针旋转60° |
D.逆时针旋转120° |
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4 . 设
、
为非零实数,
为虚数单位,
.则方程
与方程
在同一复平面内的图形(
、
为焦点)为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707aed47159fae11f47e464c548a0b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4136632fc030154165c71b7684d030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6788e8d146272f1043725cb482c05a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 方程
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e3be1d8591320a901199ad9cda4e9d.png)
您最近一年使用:0次
2018-12-04更新
|
251次组卷
|
2卷引用:2016年全国高中数学联赛湖南赛区预赛试题
6 . 已知互异的正实数
、
、
、
满足
.
证明:从
、
、
、
中任取三个数作为边长,共可构成四个不同的三角形.
![](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/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c570c70a0b68cdedd9f14e972299f8e5.png)
证明:从
![](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/365b38a7689a8eede6820cd6f1fe952b.png)
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7 . 设椭圆
经过点
,离心率为
,直线
经过椭圆
的右焦点
,与椭圆
交于点
、
,
、
、
在直线
上的射影依次为
、
、
.
(1)求椭圆
的方程.
(2)联结
、
,当直线
的倾斜角变化时,直线
与
是否交于定点?若是,求出定点的坐标并给予证明;否则,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6b94e42869013745050aba059b58dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e56c488c54149b98d84a7994e124e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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名校
8 . 在三棱锥
中,
,
,
,
,
,
. 则三棱锥的体积的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a0b15556a1584c1b6b2768bbc9cbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9a0b4628c966984499181a7a3afe00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380fdec573d2bbbdbf090fdbc2200ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7adf0423002e72a7f1063a26b71c90b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04989ba0d3f0b033fe79007becf8d1d9.png)
您最近一年使用:0次
2018-12-04更新
|
372次组卷
|
3卷引用:2016年全国高中数学联赛湖南赛区预赛试题
9 . 当一个非空数集
满足条件“若
,则
、
、
,且当
时,
”时,称
为一个数域. 以下四个关于数域的命题:
①0为任何数域的元素;
②若数域
有非零元素,则
;
③集合
为数域;
④有理数集为数域.
其中,真命题的编号为______ (写出所有真命题的编号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7259407f5deadbf2cbf0daeba368b17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34e1f0fbd1d33ea0481c3487ca240af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03b011f69dfc5262a3d82f64676739b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3c8545c1ca3a5942bdb47e0e56fb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①0为任何数域的元素;
②若数域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20a63c22f7dfb4797396dd431c05c46.png)
③集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4f7c228205a9b0504424d15872b95b.png)
④有理数集为数域.
其中,真命题的编号为
您最近一年使用:0次
10 . 在正方形
中,
为边
上一点(点
与顶点不重合). 延长
,与
的延长线交于点
. 设
、
、
的内切圆半径分别为
、
、
.
(1)证明:
,并指出点
在什么位置时,等号成立;
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2cb48c0a69b8c420c0b64b2bfa1ef7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbc7a469b1e21f1c8f3283d3893af68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e216c23df178cd616a2c2dd84648e9f5.png)
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