1 . 已知数列
,
,
,其中
.
(1)设
,证明:数列
是等差数列,并求
的通项公式;
(2)设
,
为数列
的前项和,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629e54076b5754d3309da6cdcebfefc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28652e52c0b02a343e618935ea625cbf.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d3d55a85012933f91c5d8d27d8801d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c2bc637b7e739a3f686ba75ad84d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ef8539a7a09303a95b4e79fb9949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3819480e1e624208f729ad8653e4f24f.png)
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2 . 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
3 . 用适当的方法证明下列命题,求证:
(1)
;(
)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840ab5202c0dd51fb0d9aa14a500fd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb9b6fe8959ae9e71e857b6d6fed49.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f585f8cfc92522f6daf997ebec04d.png)
您最近一年使用:0次
2021-10-03更新
|
805次组卷
|
5卷引用:江西省上饶市横峰中学2021-2022学年高二上学期期中考试数学(文)试题
4 . (1)已知
,
.求证:
;
(2)在
中,内角
的对边分别为
.若
,用反证法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a871ef7bf13de3e15489d65b57a3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b32e1a1c8cb8f9fdab1d90cb9507c97.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b774018122dfbf609f08bdbe111e2ab4.png)
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解题方法
5 . 在如图所示的几何体中,侧面
为正方形,底面
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/9aa4885b-d99d-4fd5-beec-e97d9b1aabd3.png?resizew=190)
(1)求证:
平面
;
(2)线段
上是否存在点
,使
平面
?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679a911235fae7f028966b57f150ddee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4020513c097ba34df4b42e297f892cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5867254f6e74a3e31237279cd481f6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/9aa4885b-d99d-4fd5-beec-e97d9b1aabd3.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a162b0af925d3b18d0f7e2c3b32dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4291a7c647aaf6d00e48bed030b48c.png)
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解题方法
6 . 如图,棱柱
,侧面
为正方形,在底面
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610717807640576/2611735001669632/STEM/bf05c82c1b8c43e7be2b827f906681b0.png?resizew=170)
(1)求证:
平面
;
(2)线段
上是否存在点
,使
平面
?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a614425dab3c66ab72f2ded51acf2254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679a911235fae7f028966b57f150ddee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4020513c097ba34df4b42e297f892cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5867254f6e74a3e31237279cd481f6.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610717807640576/2611735001669632/STEM/bf05c82c1b8c43e7be2b827f906681b0.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c259ae82d599c5dd81a898acf0c6ff9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4291a7c647aaf6d00e48bed030b48c.png)
您最近一年使用:0次
7 . 如图所示,四棱锥
的底面是边长为1的正方形,侧棱
底面
,且
,
是侧棱
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/86e5f5dd-6996-4e35-91f7-aa55bb982633.png?resizew=170)
(1)求四棱锥
的体积;
(2)如果
是
的中点,求证:
平面
;
(3)不论点
在侧棱
的任何位置,是否都有
?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd3eb538f36e6e722e4ce125266b99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/86e5f5dd-6996-4e35-91f7-aa55bb982633.png?resizew=170)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6d1ac6e00b74a1218fec878b15cf54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(3)不论点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
您最近一年使用:0次
2019-12-12更新
|
154次组卷
|
2卷引用:江西省吉安市(吉安县三中、泰和二中、安福二中、井大附中 )2021-2022学年高二上学期期中考试数学(理)试题
解题方法
8 . 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
名校
解题方法
9 . 已知椭圆
过点
,离心率为
.
(1)求椭圆的标准方程;
(2)过椭圆的上顶点作直线
交抛物线
于
、
两点,
为原点.
①求证:
;
②设
、
分别与椭圆相交于
、
两点,过原点
作直线
的垂线
,垂足为
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c9bebea391a1f9956dfcca98d9d1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c778b2d3185e80c9c00cd6fe156d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求椭圆的标准方程;
(2)过椭圆的上顶点作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f4123c19136d3a4dc040dce8e34e14.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/1dde8112e8eb968fd042418dd632759e.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31666076b1d37cd2f99afa950da5ab.png)
您最近一年使用:0次
2017-11-29更新
|
1317次组卷
|
4卷引用:江西省南昌市第二中学2017-2018学年高二上学期期中考数学(文)试题
10 . (1)已知a,b都是正数,求证:
.
(2)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377fcc11eac1a119fe6c20b18dae7c3b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9a060b4147c9de2677e9ae89429765.png)
您最近一年使用:0次