名校
解题方法
1 . 已知在△ABC中,角A,B,C所对的边分别为a,b,c,其中A为锐角,且asin(B+C)是
bcosC与
ccosB的等差中项.
(1)求角A的大小;
(2)若点D在△ABC的内部,且满足∠CAD=∠ABD
,∠CBD
,AD=1,求CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
(1)求角A的大小;
(2)若点D在△ABC的内部,且满足∠CAD=∠ABD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88f5f5b8240d561478e4c17decc0959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3e888051ee02f3e07647c93dc380f.png)
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名校
解题方法
2 . 已知数列{an}的前n项和为Sn,且a1=a2=1,当n≥2,且
*时,2Sn=3an+1,则an=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0025a595ff4e72a08db71d6ec82852ae.png)
您最近一年使用:0次
3 . 已知数列
,且
,则数列
前
项的和等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a5b2f8bc6fa884707629da44a2d245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 在
中,
分别是三内角
的对边,若满足条件
的三角形的解有两个,则
的长度范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2521cfe32b0b82c31e2331d88f94da57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de03610f45a98f0f46183004c225a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2762a443ca3a2f2226868c8b0a533d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-02-25更新
|
322次组卷
|
2卷引用:河北省武邑中学2019-2020学年高二上学期期中考试数学试题
名校
解题方法
5 . 已知
的内角
,
,
的对边分别是
,
,
,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
__________ .若
为边
上的一点,且满足
,
,锐角三角形
的面积为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f8afcf46ccab8eca35707b101c3a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b12efb03327f461e868b2ea433f9b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
您最近一年使用:0次
解题方法
6 . 已知函数
在
上的零点为等差数列
的首项
,且数列
的公差
.
(1)求数列
的等差数列;
(2)记
,数列
的前
项和为
.若
恒成立,求
得取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78fa6bc6061938fdde6d0de0fae4241c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047056c99b39c70fa40d3c8178e5b631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c6e0c2d16cda7e8b2b8c588adeb8ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3012337aa392709349731fb1eef5b5.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c078b28fc53ea06fa35a3a630fbd63b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a20e4debab81a7a338fd6bd1812012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6293ccaa3a303a3e1fbe9049f30e93d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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7 . 各项均不为零的等差数列
中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d84adcf862cb7057595c4b9cbf6800.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a3bdf646bd1499129717627b3a111f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d84adcf862cb7057595c4b9cbf6800.png)
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名校
解题方法
8 . 若数列
满足
且
,则满足不等式
的最大正整数
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2842a322d17d3e2b9f284c3046adbf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70d097171092f8105daaaff7ba17b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.20 | B.19 | C.21 | D.22 |
您最近一年使用:0次
2020-02-18更新
|
460次组卷
|
2卷引用:河北省衡水市武邑中学2018-2019学年高一下学期6月月考数学试题
名校
9 . 已知
满足约束条件
且
的最小值为2,则常数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd4c53b2e74ee2b67aa5f12b53e8dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfeb8b0075f7dcfc571034c2a849e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
您最近一年使用:0次
2020-01-23更新
|
68次组卷
|
9卷引用:【全国百强校】河北省武邑中学2019届高三上学期第二次调研考试数学(理)试题
【全国百强校】河北省武邑中学2019届高三上学期第二次调研考试数学(理)试题(已下线)专题7.2 二元一次不等式(组)与简单的线性规划问题(讲)【文】-《2020年高考一轮复习讲练测》(已下线)专题7.2 二元一次不等式(组)与简单的线性规划问题(讲)【理】-《2020年高考一轮复习讲练测》福建省三明市三明第一中学2019-2020学年高三上学期期中数学(理)试题(已下线)2019年12月29日《每日一题》必修5+选修2-1理数-每周一测湖北省八校2018届高三上学期第一次联考(12月)数学(文)试题【全国百强校】海南省海南中学2018届高三第五次月考数学(理)试题(已下线)专题7.2 二元一次不等式(组)与简单的线性规划问题(讲)-江苏版《2020年高考一轮复习讲练测》(已下线)专题7.2 二元一次不等式(组) 与简单的线性规划问题(精讲)-2021届高考数学复习(理)一轮讲练测
名校
10 . 秦九韶是我国南宋时期的数学家,普州(现四川省安岳县)人,他在所著的《数书九章》中提出的多项式求值的秦九韶算法,至今仍是比较先进的算法.如图的程序框图给出了利用秦九韶算法求某多项式值的一个实例,若输入
的值为2,则输出的
值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/e7e3481e-d676-422d-990a-eb3b1b2f75ff.png?resizew=292)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/e7e3481e-d676-422d-990a-eb3b1b2f75ff.png?resizew=292)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-01-17更新
|
1204次组卷
|
7卷引用:河北省衡水市衡水中学2019届高三下学期六调考试(文)数学试题
河北省衡水市衡水中学2019届高三下学期六调考试(文)数学试题(已下线)【全国百强校】河北省衡水中学2019届高三下学期六调考试数学(文)试题(已下线)2020届高三12月第01期(考点11)(理科)-《新题速递·数学》(已下线)2020届高三12月第01期(考点11)(文科)-《新题速递·数学》2017届陕西省榆林市高三第二次模拟测试数学(理)试题(已下线)文科数学-2020年高考押题预测卷02(新课标Ⅱ卷)《2020年高考押题预测卷》(已下线)理科数学-2020年高考押题预测卷02(新课标Ⅱ卷)《2020年高考押题预测卷》