1 . 求证:
.证明:因为
和
都是正数,所以为了证明
,只需证明
,展开得
,即
,只需证明
.因为
成立.所以不等式
成立.上述证明过程应用了( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564b3f0440d047ffdd641fb56974355b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f499828bdc14df52f0427a78ef51cc5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7782200f8eab2b9add12b2a99b6a03b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564b3f0440d047ffdd641fb56974355b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0825879cdd8323b3ff48e311aade56fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6be8f4788729fba5529f31660268e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef35b7c74b6e11ee179054fd7bdba3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d6e82ca711596894dedbe1896471ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d6e82ca711596894dedbe1896471ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564b3f0440d047ffdd641fb56974355b.png)
A.综合法 | B.分析法 | C.反证法 | D.间接证法 |
您最近一年使用:0次
解题方法
2 . 证明下列不等式:
(1)当
时,求证:
;
(2)设
,
,若
,求证:
.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0745ecaef6c9d1b65666e30892f597.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feac4de538eecda2cb5cf860cd665261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3183647223da8dceeeee49bb69c64166.png)
您最近一年使用:0次
2018-02-27更新
|
1017次组卷
|
2卷引用:赣州市红旗实验中学2017-2018学年高二下学期期中考试卷文科数学试题
3 . 若
,则称
为
维空间向量集,
为零向量,对于
,任意
,定义:
①数乘运算:
;
②加法运算:
;
③数量积运算:
;
④向量的模:
,
对于
中一组向量
,若存在一组不同时为零的实数
使得
,则称这组向量线性相关,否则称为线性无关,
(1)对于
,判断下列各组向量是否线性相关:
①
;
②
;
(2)已知
线性无关,试判断
是否线性相关,并说明理由;
(3)证明:对于
中的任意两个元素
,均有
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d935457799f234e86a59e2f662d5ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00d8f90655e6341907aa9c7c62d4398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554f144d15fc567b25935b38917430c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aff8d9b6533ff319420cdc5e8740b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1156e087d0c92bf15ea7a53d021fcc.png)
①数乘运算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee3d2d5f39d4050799537d5ad6bb375.png)
②加法运算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374036b2d97be3bb771c6d1bfd2ae6eb.png)
③数量积运算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3760d1b114cab294d2b8af405de49814.png)
④向量的模:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e7f7030526d65d5fff785d0d35a6ba.png)
对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00d8f90655e6341907aa9c7c62d4398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab882b48940b6e1a185a513a0d8e8d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3e3f607c7d170c8a9e614bfd2cb5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946f81ae87f9c8cdc1017af6c1ec2fb2.png)
(1)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56eb5f6747ea94d1075210265214211.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6432103414cd0efd40a0c0017eb11b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf1bee58a691b31e06e088afed4c25c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76eb5fb9c09b830eecb5ba7efea4e09.png)
(3)证明:对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00d8f90655e6341907aa9c7c62d4398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c21920a0a39b1604e130601f061b056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1120f6ff618146c9851df5dea05c1f55.png)
您最近一年使用:0次
名校
解题方法
4 . 若定义在D上的函数
满足:对任意
,存在常数
,都有
成立,则称
是D上的有界函数,其中
称为函数
的上界,最小的M称为函数
的上确界.
(1)求函数
的上确界;
(2)已知函数
,
,证明:2为函数
的一个上界;
(3)已知函数
,
,若3为
的上界,求实数
的取值范围.
参考数据:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea232de27d21a2646fd4520ea0726bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a920c2d27134a9c514f82bf464aed4ee.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066737c8b5ab483d0e853124de99429e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72bd2c5317e503a513881970a9badf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc03b242716eaa6ee3bef9061a63ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4cbc7b067862a3d9c6789b392fc068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9405361d7be3c9e4d462a4e955d8fe3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c0309456de2cd6420ece4fbc5eeddb.png)
您最近一年使用:0次
2024-04-30更新
|
228次组卷
|
5卷引用:江西省兴国平川中学等多校联考2023-2024年高一下学期期中调研测试数学
解题方法
5 . 已知四棱锥
的底面是一个梯形,
,
,
,
,
,
.
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729d5cb74bb927aa549ce596a35b26b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7fca40920c70c01c551e83d61e69b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b381b999b2c61fd08a36eddf16658682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02535e1a690ca111ca7a395a1bf48080.png)
您最近一年使用:0次
名校
6 . 如图,在直三棱柱
中,
,
,
为
的中点.
平面
.
(2)若以
为直径的球的表面积为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95578eba5dd34ca64b5f228640819cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b531aaca9d037a0d047511eec8f350ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95265f94a8eb7f76b5db6875246a091d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee527f97d0bfc89f791b728d80e562d3.png)
您最近一年使用:0次
2024-04-20更新
|
1399次组卷
|
3卷引用:江西省赣州市十八县(市)二十四校2023-2024学年高二下学期期中考试数学试题
7 . 已知函数
在点
处的切线
经过点
.
(1)求
的方程.
(2)证明:数列
是等比数列.
(3)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9c4c90bc9a55a01aff4e7a51e3babc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e684bbf8039dc14ea6a402f3478b3aa4.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213e22890204937a5dded4436369390f.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110052f0b9fb3f827369b6cc056d8ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
8 . 在
个数码
构成的一个排列
中,若一个较大的数码排在一个较小的数码的前面,则称它们构成逆序(例如
,则
与
构成逆序),这个排列的所有逆序的总个数称为这个排列的逆序数,记为
,例如,
.
(1)计算
;
(2)设数列
满足
,
,求
的通项公式;
(3)设排列
满足
,
,
,
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e04f64c273928cb099d08ac52cfcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc77dfe095330d5ac22696e02745f4f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b066322d5ce7859e174207d32fdeb8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb8280885d0fd1a072039e0bbcd15a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50bae0107d95c2964c862d83a78a7880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c74b667cbad8dc6743f8f267be05880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8b82f01d3e473e2eb9cb2d6c74cb74.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe67d956e76fbdc799d356b6fb492c80.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94669ca9b5a7ad3de1034b7503ca0d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1404c7e8a894900a5265a502adf478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)设排列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c1ded5ba5f43cdcf3e79c56db2f630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be0310608bc9ed911cad3df317bddbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37be536781a2cad0ab0721237513cd54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2699a580bcb4b0517f7c055cad6568a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a5e3db38502800e4c7f999185bba33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f633a299fcefe6528943858cc8a5536c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8154ded0f61fb250cbccccfe9f646ef1.png)
您最近一年使用:0次
名校
9 . 如图,已知正方形
和矩形
所在的平面互相垂直,
,
,M是线段
的中点.
平面
;
(2)若
,求二面角
的大小;
(3)若线段
上总存在一点P,使得
,求t的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef45f443346d6214dd03e0aea2e190cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4019805fed3b6cca619f4035e7618cd0.png)
(3)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1e3f76c717167bf2b5b1e0d291b39f.png)
您最近一年使用:0次
2023-10-27更新
|
988次组卷
|
16卷引用:江西省龙南中学2022-2023学年高二下学期期中数学试题
江西省龙南中学2022-2023学年高二下学期期中数学试题广东省汕头市潮阳区棉城中学2021-2022学年高二上学期期中数学试题福建省漳州立人高级中学2022-2023学年高二下学期期中数学试题广东省梅州市大埔县虎山中学2023-2024学年高二上学期期中数学试题广东省揭阳市普宁市兴文中学2023-2024学年高二上学期期中数学试题广东省汕头市潮阳一中明光学校2023-2024学年高二上学期期中测试数学试卷(已下线)模块三 专题2 解答题分类练 专题3 空间向量线性运算(苏教版)江苏省苏州市2019-2020学年高二上学期期末数学试题(已下线)专题07 空间向量与立体几何-【备战高考】2021年高三数学高考复习刷题宝典(压轴题专练)(已下线)第24节 直线、平面平行的判定与性质-备战2023年高考数学一轮复习考点帮(全国通用)第一章 空间向量与立体几何单元测试(巅峰版)辽宁省大连部分重点高中2022-2023学年高二上学期10月月考数学试卷河南省濮阳市南乐县第一高级中学2022-2023学年高二上学期第一次月考数学试题江西省丰城中学2022-2023学年高一下学期期末考试数学试题西藏林芝市2023-2024学年高二上学期期末学业水平监测数学试题(已下线)专题01 空间向量与立体几何(3)
名校
解题方法
10 . 已知点
和直线
,动点
到点
的距离与到直线
的距离之比为
.
(1)求动点
的轨迹
的方程;
(2)过点
的直线交
于
两点,若点
的坐标为
,直线
与
轴的交点分别是
,证明:线段
的中点为定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/651e74c2082e762ab7c2e776a168975d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b58b60f485e0e3b55dc146a3df5797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
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6卷引用:江西省赣州市全南县全南中学2024届高三上学期期中数学试题
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