1 . 证明以下结论:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d5f61f0ec2df05501cc0706b4854e8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0a35d98264270a5af534731fb37ceb.png)
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2 . 在利用反证法证明命题“
是无理数”时,假设正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a581f283460235482116fbe3ba41efe.png)
A.假设![]() | B.假设![]() |
C.假设![]() ![]() | D.假设![]() |
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2018-12-17更新
|
531次组卷
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13卷引用:【校级联考】江西省上饶市“山江湖”协作体2018-2019学年高二上学期第三次月考数学(文)试题
【校级联考】江西省上饶市“山江湖”协作体2018-2019学年高二上学期第三次月考数学(文)试题2015-2016学年河北省武邑中学高二上周考数学试卷2016-2017学年河北省枣强中学高二上学期期末考试文数试卷河北省武邑中学2016-2017学年高二下学期期中考试数学(理)试题西藏自治区林芝市2016-2017学年高二下学期期末考试数学(理)试题北京东城二中高二下期末数试题(已下线)2019年3月24日 《每日一题》理数选修2-2-每周一测甘肃省武威第五中学2018-2019学年高二5月月考文科数学试题(已下线)2019年6月24日《每日一题》(文数)—— 直接证明与间接证明新疆喀什巴楚县第一中学2019-2020学年高二下学期期中考试数学(理)(B卷)试题新疆喀什巴楚县第一中学2019-2020学年高二下学期期中考试数学(理)(A卷)试题西藏自治区山南市第二高级中学2019-2020学年高二下学期月考考试数学(理)试题陕西省渭南市三贤中学2022-2023学年高二下学期期中文科数学试题
3 . 如图所示,四棱锥
中,
底面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e38fff6f41b005dc9c5f9de6942786.png)
,
为
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e38fff6f41b005dc9c5f9de6942786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4712fce09b812790cfeffc3bd0dacad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)求证:;
(2)求点D与平面的距离.
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4 . 如图,在斜三棱柱
中,
,
,
,侧面
与底面
所成的二面角为120°,
分别是棱
、
的中点.
(1)求
与底面
所成的角;
(3)求经过
四点的球的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68bd092beb0a55c16bc349df9f4862da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9748be98b0f308f3f34f7f3dbade9e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071cae0201e80bdc2a8f722694093ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b96dce1ec94eb90c243b2eddb78476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846a84e40de724b4c60a20c4faa194b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5048a0736cfe012cfc909e631e2a2969.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5048a0736cfe012cfc909e631e2a2969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
(2)证明平面
;
(3)求经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833490660e26804ee5639924729f4efe.png)
![](https://img.xkw.com/dksih/QBM/2018/12/9/2092925445865472/2094360909873152/STEM/637b5e4b8b4f4b32b125e215648888fa.png?resizew=197)
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2018-12-11更新
|
521次组卷
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3卷引用:江西省玉山一中2019届高三第一学期期中考试数学(理科)试题
5 . 如图,在底面是正三角形的三棱锥P﹣ABC中,PA=AB=2,PB=PC=
.
(1)求证:PA⊥平面ABC;
(2)若点D在线段PC上,且直线BD与平面ABC所成角为
,求二面角D﹣AB﹣C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
(1)求证:PA⊥平面ABC;
(2)若点D在线段PC上,且直线BD与平面ABC所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://img.xkw.com/dksih/QBM/2018/12/9/2092925445865472/2094360909840384/STEM/4106370915564fac82605608cda4d95e.png?resizew=131)
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6 . 已知三棱柱
的侧面
是菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7c6451d3-ae2e-4642-a318-30c43e1357fd.png?resizew=212)
(1)求证:
;
(2)若
,
,
,求
的值,使得二面角
的余弦值的为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f33552d28bc1ee6b1107d2c42c0a94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7c6451d3-ae2e-4642-a318-30c43e1357fd.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894f74520b33b8c8b482ce6f057c5753.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0ef62241510fd1d4d04866208ef031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19d00fb6229912050066030881ae98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02795ff1af51fb0672800ceb02e7893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbc715353b069dff3a056943de78981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a5e6c1452add80f47cbb381d94562a.png)
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2018-06-09更新
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916次组卷
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2卷引用:江西省上饶中学2019届高三上学期期中考试数学试题3
7 . 已知数列
满足
,数列
的前
项和为
.
(1)求
的值;
(2)若
.
①求证:数列
为等差数列;
②求满足
的所有数对
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e0f52220c2beea276b8c79a149470a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ebea1be9d8f231b5057cec66f91a6c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68022e117dddae950c44f2d267c8a064.png)
①求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489d04d5415e37ede025af850dde6490.png)
②求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1b2cfd50d5eec54f114d2ce7a246bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca8fab4443deeaa1dd3f39721e2d49ca.png)
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8 . 已知集合M是满足下列性质的函数
的全体:在定义域内存在
使得
成立.
(1)函数
是否属于集合M?请说明理由;
(2)函数
M,求a的取值范围;
(3)设函数
,证明:函数
M.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbf1211335bcbc0ebb05414669eda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6cbfb814f425ac7c7b89ed5ec63d04.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ece7bd3130e03c4c18ab8ddd301db3a3.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/467025eef6361ec633f348680d75047d.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2874315406222ce86a37e061582e00d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ebf355866a70c5b65d00270932db65.png)
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2018-11-04更新
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926次组卷
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2卷引用:江西省上饶中学2018-2019学年高一上学期期中考试数学试题2
解题方法
9 . 如图,已知圆
的方程为
,过点
的直线
与圆
交于点
,与
轴交于点
,设
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22840186db0afc0e2b2e8915ce79b998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b498d48d4e6a2fef909d4ff5cad6a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/2f8cc72e-5419-4373-8feb-89112b128a6f.png?resizew=220)
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解题方法
10 . 已知椭圆
,离心率
,点
在椭圆上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/706080d2-30dc-45dd-a00b-8cc2af2c5e6c.png?resizew=232)
(1)求椭圆
的标准方程;
(2)设点
是椭圆
上一点,左顶点为A,上顶点为
,直线
与
轴交于点
,直线
与
轴交于点
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fad038d2b0f4007c4e638c40a23e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8745fac475b6d51b2dec5395ccf36bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b113a198d2fe6797335d979f1dff3ad6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/706080d2-30dc-45dd-a00b-8cc2af2c5e6c.png?resizew=232)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdba575916145031ef2ea38277247a9.png)
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