名校
解题方法
1 . 如图,四棱锥
中,
,
,E为PB的中点.
平面PAD;
(2)过D点是否存在一个与PA,AB相交,且与平面PBC平行的平面?若存在,指出交点位置,并证明你的结论;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4031f4aae0b996ce8fec956fb2879f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30e54bb771ad15067221459f202f01.png)
(2)过D点是否存在一个与PA,AB相交,且与平面PBC平行的平面?若存在,指出交点位置,并证明你的结论;若不存在,请说明理由.
您最近一年使用:0次
2022-05-04更新
|
985次组卷
|
5卷引用:福建省宁德市同心顺联盟2021-2022学年高一下学期期中联合考试数学试题
2 . 用综合法或分析法证明:
(1)如果
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd70f831f301205134280f6432c8f84d.png)
(2)求证
.
(1)如果
![](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/bd70f831f301205134280f6432c8f84d.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7677985318eb222a2af0aef6e7dd28.png)
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3 . 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
名校
解题方法
4 . 设
是定义在R上的函数,对任意
,恒有
,当
时,有
.
(1)求证:
,且当
时,
;
(2)证明:
在R上单调递减.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b8e9b3f07d91da4d256d18df240fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5456d544e2f8d22c08f3ccee002dad4a.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61c9a7ed0961f8977a21dab37aab396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be1d8c6384d7fabddb693b2b7fcdf4a.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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名校
5 . 下列命题正确的有:________ .
①
;
②已知
,若
,则
.
③用反证法证明“已知
,且
,求证:
.”时,应假设“
且
”;
④命题“若
,则
”的逆否命题是“若
,则
”.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d06a4bdf067ee8c14ce02d71271ddf.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eecb11de93939d81b65541b0bbdeb7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efd32ba5030535598e979fd6d3a4d5c.png)
③用反证法证明“已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5977232839b54df456aeeacb13512d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c412d5329ba909164329663b7eecdfe.png)
④命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8a2a94168af9b16ce89271a5d8dc6b.png)
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6 . (1)已知
,证明:
;
(2)设
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e27526fad7d109f3f1e157352e5fb5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7580eda2d6abb825698d18d265a7401b.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefcc738d395f255dc3518795ce597cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3b8f0a0cb7d7a8e732c33a62fdfacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f1af8d815f4b284bc0de0664bd440d.png)
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解题方法
7 . 已知函数
的图象过点
.
求证:(1)函数
在
上为增函数;
(2)用反证法证明方程
没有负根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45783a196baabce3a8d876e5cc128c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953bfeb398bab2b2ba61b3e6bf0a22e.png)
求证:(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f00bba28ce932fbcc82ed562994f031.png)
(2)用反证法证明方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3047d4ab078dafc06c047bcbf0a6ffaf.png)
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名校
8 . 已知函数
.
(1)判断函数
的奇偶性,并证明;
(2)求证:
在
上单调递减.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d102f257b33791eb0fa9571b1bcf13f.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
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名校
9 . 设函数
.
(1)求
的值;
(2)判断函数
的奇偶性并证明;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa6886b6b9df83a5942cdb0c7017539.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a99715731d8dccd5fd0c77abbd9e3.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6853d01dfa3c24c7a5bf9ad0b026567d.png)
您最近一年使用:0次
2021-11-16更新
|
200次组卷
|
2卷引用:广东省广州市番禺区实验中学2021-2022学年高一上学期期中数学试题
名校
解题方法
10 . 选用恰当的证明方法,证明下列不等式.
(1)已知
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbefc06b3b4e54a6a1690e870efc69b.png)
(2)已知a,b,c为正数,且满足
.证明:
;
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a521891098b625f372ff648d110afe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbefc06b3b4e54a6a1690e870efc69b.png)
(2)已知a,b,c为正数,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3681a97ebef383e8968347548102fb49.png)
您最近一年使用:0次
2021-11-07更新
|
349次组卷
|
3卷引用:甘肃省兰州市西北师范大学附属中学2021-2022学年高一上学期期中数学试题