解题方法
1 . 将数列{an}中的所有项排成如下数阵:其中每一行项数是上一行项数的2倍,且从第二行起每一行均构成公比为2的等比数列.
a1
a2,a3
a4,a5,a6,a7
a8,a9,a10,a11,a12,a13,a14,a15
……
记数阵中的第1列
构成的数列为
,
为数列
的前n项和,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
________ ,
________ .
a1
a2,a3
a4,a5,a6,a7
a8,a9,a10,a11,a12,a13,a14,a15
……
记数阵中的第1列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6986509485f4b84c8f4f4e34a43e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2612ac1898372c023663064336b1daab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22458185a169ccd926787f40d1e898ff.png)
您最近一年使用:0次
名校
2 . 将数列
中的所有项排成如下数阵:其中每一行项数是上一行项数的2倍,且从第二行起每一行均构成公比为2的等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
,
,
,
,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bbae9353140c2235610852d04a9a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab783880d7aabc422916886630fc576.png)
记数阵中的第1列
,
,
,
构成的数列为
,
为数列
的前
项和,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
______ ,
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84c30444f13d37ada78285dc4f83b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e76d1d8e50dda4d50229a8a20c57e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e7b23fd74e3cf89ac541cb7a5d88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be9c9b05fd84ac9256d49a5a553af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bbae9353140c2235610852d04a9a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab783880d7aabc422916886630fc576.png)
记数阵中的第1列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2612ac1898372c023663064336b1daab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22458185a169ccd926787f40d1e898ff.png)
您最近一年使用:0次
2020-11-29更新
|
335次组卷
|
3卷引用:江苏省南通市西亭高级中学2020-2021学年高三上学期省模考模拟二数学试题
江苏省南通市西亭高级中学2020-2021学年高三上学期省模考模拟二数学试题湖南省娄底市冷水江市第一中学2020-2021学年高三上学期期中数学试题(已下线)第44练 推理与证明-2021年高考数学(文)一轮复习小题必刷
名校
3 . 十六、十七世纪之交,随着天文、航海、工程、贸易及军事的发展,改进数字计算方法成了当务之急,约翰•纳皮尔正是在研究天文学的过程中,为了简化其中的计算而发明了对数,后来天才数学家欧拉发现了对数与指数的关系,即
,现已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c465d767e74627f297505ada5dc01e6.png)
____ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a42f77309f3a367eb99e1598163503b.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f16a9a90d37b78fdcfe531bd0681a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cfcf6052251d8644fa0999cfcea27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c465d767e74627f297505ada5dc01e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a42f77309f3a367eb99e1598163503b.png)
您最近一年使用:0次
2020-11-29更新
|
1528次组卷
|
8卷引用:江苏省南通市启东市2020-2021学年高一上学期期中数学试题
江苏省南通市启东市2020-2021学年高一上学期期中数学试题江苏省常州市前黄高级中学2021届高三下学期5月高考适应性考试(一)数学试题(已下线)黄金卷17-【赢在高考·黄金20卷】备战2021高考数学全真模拟卷(新高考专用)江苏省南通市2020-2021学年高一下学期期初数学试题(已下线)重组卷02-冲刺2021年高考数学之精选真题+模拟重组卷(新高考地区专用)(已下线)解密01 函数及其性质(分层训练)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(新高考专用)(已下线)专题6 纳皮尔江苏省南京市雨花台中学2022-2023学年高一上学期期中数学试题
解题方法
4 . 已知数列
的各项均为正数,其前
项和为
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
___________ ;若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb0f2883ddd23be9435fda33e9c611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
您最近一年使用:0次
名校
5 . 如图,在四边形ABCD中,
,
,
,且
,
则实数
的值为__________ ,若M,N是线段BC上的动点,且
,则
的最小值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15334a2cf8cc0f7432b3ba64850921ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2dc819fe1cc5a7f843926bdd19a5484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbe31c30482f79407b877d5039a9412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc289ac171c5a2df841fbb7d15fd89d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/4cf4c3b6-5f36-40a9-aa69-5bb1f2f741df.png?resizew=178)
您最近一年使用:0次
2020-11-27更新
|
2496次组卷
|
9卷引用:江苏省无锡市宜兴市丁蜀高级中学2020-2021学年高三上学期期中检测数学试题
名校
6 . 任取一个正整数,若是奇数,就将该数乘3再加上1;若是偶数,就将该数除以2.反复进行上述两种运算,经过有限次步骤后,必进入循环圈1→4→2→1,这就是数学史上著名的“冰雹猜想”(又称“角谷猜想”).如取正整数6,根据上述运算法则得出6→3→10→5→16→8→4→2→1,共需要8个步骤变成1(简称为8步“雹程”).现给出冰雹猜想的递推关系如下:已知数列
满足:
(
为正整数),
当
时,试确定使得
需要______ 步雹程;若
,则
所有可能的取值所构成的集合![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9163ebe812708ee5337d62298c2e3363.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999ac8c1ef39251e07a7fc54cbf7e26e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158770f1d0ecfa880751020125da546d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e6261372802c3eea7084aa892b26c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15ffa7fecea3704dc892ea8cd513c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42aab89e67736c81f63af477d8990dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9163ebe812708ee5337d62298c2e3363.png)
您最近一年使用:0次
2020-11-22更新
|
706次组卷
|
8卷引用:山东省临沂市2020-2021学年高三上学期期中考试数学试题
山东省临沂市2020-2021学年高三上学期期中考试数学试题福建省福州市福清西山学校高中部2021届高三12月月考数学试题福建省连城县第一中学2021届高三上学期第二次月考数学试题(已下线)“8+4+4”小题强化训练(28)数列的概念及表示法-2022届高考数学一轮复习(江苏等新高考地区专用)普通高等学校招生全国统一考试数学预测卷(七)江苏省苏州市吴江区2022-2023学年高二上学期9月教学质量调研数学试题山西省临汾市2023届高三二模数学试题山东省临沂第十八中学2024届高三第一次调研考试数学试题
名校
解题方法
7 . 已知菱形
边长为3,
,
为对角线
上一点,
.将
沿
翻折到
的位置,
记为
且二面角
的大小为120°,则三棱锥
的外接球的半径为______ ;过
作平面
与该外接球相交,所得截面面积的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1902fa33d5b84c4156c19b34bbecdb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ea25ef38e4afa8f75ffd0842890289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc66a96c1297e7068e987e0e70723e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2020-11-22更新
|
1000次组卷
|
5卷引用:江苏省盐城中学2020-2021学年高三上学期12月第三次阶段性质量检测数学试题
江苏省盐城中学2020-2021学年高三上学期12月第三次阶段性质量检测数学试题山东省潍坊市2020-2021学年高三上学期期中考试数学试题广东省惠州市光正实验学校2023届高三上学期11月月考数学试题(已下线)第三章 折叠、旋转与展开 专题三 球与翻折 微点3 球与翻折综合训练(已下线)专题09 外接球、内切球与动点最值(1) -期末考点大串讲(苏教版(2019))
名校
解题方法
8 . 在
中内角A,B,C的对边分别为a,b,c,若
,则
=__________ ;
的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b269069e460c7ab1d90ee9bac7bd876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d95ace76743d5438e3a45161480cd6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8264232a5ed0f6c1beab27d94709aa2.png)
您最近一年使用:0次
2020-11-20更新
|
1634次组卷
|
3卷引用:河北省衡水中学2021届高三上学期二调数学试题
河北省衡水中学2021届高三上学期二调数学试题山东省寿光市圣都中学2020-2021学年高三上学期12月适应性考试数学试题(已下线)“8+4+4”小题强化训练(21)正弦定理与余弦定理-2022届高考数学一轮复习(江苏等新高考地区专用)
名校
9 . 已知函数
,函数
的图象在点
处的切线方程为________ ;若关于
的不等式
有正整数解,则实数
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b26f55c7c29644dfe0277d3e2adf10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39c75482a91f97f34284613a2433e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2020-11-14更新
|
290次组卷
|
5卷引用:江苏省常州市华罗庚中学2020-2021学年高三上学期10月一轮复习阶段性检测数学试题
江苏省常州市华罗庚中学2020-2021学年高三上学期10月一轮复习阶段性检测数学试题(已下线)专题20 导数及其应用(客观题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题21 导数及其应用(客观题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)(已下线)专题22 导数及其应用(客观题)-2021年高考数学(理)二轮复习热点题型精选精练(已下线)2021届高三高考数学适应性测试八省联考考后仿真系列卷十
名校
10 . 已知圆
,点
,从坐标原点
向圆
作两条切线
,
,切点分别为
,
,若切线
,
的斜率分别为
,
,
,则
为定值________ ,
的取值范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc985a057296fca38531cd315505b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a856214b8ae5be8d0aae959335cd9d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4cc51d393a94365f7008de5eae8879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c19fa4cd646f4d877c3e58cc346651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4066dc453c2e3fa4b08023f76229e0a7.png)
您最近一年使用:0次
2020-11-14更新
|
339次组卷
|
5卷引用:江苏省镇江市丹阳市吕叔湘中学2020-2021学年高三上学期11月教学调研数学试题
江苏省镇江市丹阳市吕叔湘中学2020-2021学年高三上学期11月教学调研数学试题(已下线)专题14 直线与圆的方程(客观题)-2021年高考数学(理)二轮复习热点题型精选精练(已下线)专题13 直线与圆的方程(客观题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题13 直线与圆的方程(客观题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)人教A版(2019) 选修第一册 实战演练 第二章 课时练习19 直线与圆的位置关系