名校
1 . 数列
,
,
,
,…,则
是该数列的第__________ 项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68c1d20a422a363e356a160f096503c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ba5418a60abb24191ef4cabddc4fd8.png)
您最近一年使用:0次
名校
2 . 古希腊毕达哥拉斯学派的数学家常用小石子在沙滩上研究数学问题,他们在沙滩上画点或用小石子来表示数.比如,他们研究过图1中的1,3,6,10,…,这样的数称为三角形数;类似地,图2中的1,4,9,16,…,这样的数称为正方形数;图3中的1,5,15,30,…,这样的数称为正五边形数.那么正五边形数的第2020项小石子数是( )
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754843633582080/2756263311237120/STEM/2bcf6431400a42a6b55946956d9b6db7.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754843633582080/2756263311237120/STEM/17687d8e52904dcd9be6492dbbc7be59.png?resizew=242)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754843633582080/2756263311237120/STEM/2bcf6431400a42a6b55946956d9b6db7.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754843633582080/2756263311237120/STEM/17687d8e52904dcd9be6492dbbc7be59.png?resizew=242)
A.5×1010×2021 | B.5×1010×2019 | C.5×1011×2019 | D.5×1011×2021 |
您最近一年使用:0次
名校
3 . 如图,一个树形图依据下列规律不断生长,1个空心圆点到下一行仅生长出1个实心圆点,1个实心圆点到下一行生长出1个实心圆点和1个空心圆点,则第11行的实心圆点的个数是
![](https://img.xkw.com/dksih/QBM/2017/7/18/1732690148597760/1733728765911040/STEM/21fb0fac-d39a-428e-8959-a7ac511e8be9.png?resizew=349)
![](https://img.xkw.com/dksih/QBM/2017/7/18/1732690148597760/1733728765911040/STEM/21fb0fac-d39a-428e-8959-a7ac511e8be9.png?resizew=349)
A.21 | B.34 | C.55 | D.89 |
您最近一年使用:0次
2017-07-19更新
|
430次组卷
|
4卷引用:人教A版 全能练习 数列
4 . 如图都是由三角形按一定规律组成的,其中第①个图形共有3个顶点,第②个图形共有6个顶点,第③图形共有10个顶点,…,按此规律排列下去,第⑥个图形顶点的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/74b406b9-7dd0-490e-a5cd-22485f332573.png?resizew=227)
A.21 | B.28 | C.36 | D.45 |
您最近一年使用:0次
5 . 观察下列等式:
,
,
,…,根据上述规律,第五个等式为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b7665d2244278da84dc45faa6aee42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3607f7acce2d96f68b873a6dbfc764b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9a899d7712fa083a7394274e922b48.png)
您最近一年使用:0次
2019-01-30更新
|
146次组卷
|
20卷引用:2011-2012学年甘肃兰州一中高一下学期期中考试数学试卷
(已下线)2011-2012学年甘肃兰州一中高一下学期期中考试数学试卷2010年高校招生全国统一考试理数(陕西卷)理科数学(必修选修Ⅱ)(已下线)2011年湖南省邵阳市二中高二上学期末理科数学卷(已下线)2010-2011年江苏省泰州中学高二下学期期中考试理数(已下线)2012届内蒙古包头三十三中高三上学期期中考试理科数学(已下线)2011-2012学年广东省执信中学高二下期中理科数学试卷(已下线)2011-2012学年广东新兴县惠能中学高二下学期期中理科数学试卷(已下线)2013-2014学年河北保定高阳中学、定兴三中高二下学期期末理数学卷2015-2016学年北大附中河南分校高二下期中理科数学试卷江西宜春南苑实验学校2016-2017下学期高二期中试卷数学(理)试题广东省揭阳市第三中学2016-2017学年高二数学理科复习检测试题湖南省衡阳市第八中学2017-2018学年高二上学期期末考试数学(理)试题高中数学人教A版选修2-2 综合复习与测试(6)高中数学人教A版选修2-2 综合复习与测试(3)黑龙江省双鸭山市第一中学2017-2018学年高二4月月考数学(文)试题1吉林省吉林市普通高中友好学校联合体第三十届基础年段2019-2020学年高二(下)期末数学(文科)试题甘肃省武威市凉州区2020-2021学年高二上学期期末考试数学(理科)试题陕西省榆林市绥德中学2021-2022学年高二下学期第一次阶段性测试理科数学试题陕西省西安市高新第七高级中学2020-2021学年高二下学期期中文科数学试题陕西省宝鸡市千阳县2022-2023学年高二下学期期中文科数学试题
名校
6 . 平面上有n条直线,它们任何两条不平行,任何三条不共点,设
条这样的直线把平面分成
个区域,则
条直线把平面分成的区域数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d8a5282de80b7a8e2cd29049d8177e.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e6cb8d4e39fa44f71df04b74f123f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b00f4eb7f1bd2ccefbabf0c1dfa8f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d8a5282de80b7a8e2cd29049d8177e.png)
您最近一年使用:0次
2018-02-25更新
|
405次组卷
|
3卷引用:吉林省长春市第二十九中学2020-2021学年高一下学期期中数学试题
解题方法
7 . 若
,
,
,
,
均为正数,则有
二元均值不等式:
,当且仅当
时取等号;
三元均值不等式:
,当且仅当
时取等号;
四元均值不等式:
,当且仅当
时取等号.
(1)猜想
元均值不等式;
(2)若
,
,
均为正数,且
,求
的最大值.
![](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/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
二元均值不等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ac5bcc086eddd5cd7d85b8b85b8d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b2fb1017d5dfe3a300de3e14a71b6f.png)
三元均值不等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2daa924ce81a49c4f2c097a37db9c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3628a3eef8edc8dafbb942c00bb003.png)
四元均值不等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66985785aa702ab35a367fdcdfb5e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f781f388a0c97838a2445e7600ad3294.png)
(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb603414e6b47ce46dbbcd3f955a424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e823000035b4482d4868da22c0f9fc7.png)
您最近一年使用:0次
名校
8 . 观察下列式子:
你可归纳出的不等式是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36eea9419cca668bb39048cee627e46d.png)
您最近一年使用:0次
2019-12-02更新
|
164次组卷
|
2卷引用:上海市复旦大学附属中学2017-2018学年高一下学期期末数学试题
19-20高一·全国·课后作业
9 . 分段函数
可以表示为
,分段函数
,可表示为
,仿照上述式子,分段函数
,可表示为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba99a5c5661eedaef4b36ade1a7c5c5.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1449b3e0e9ac7d3443eb40bd01b3dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd6be947e37552dfa0565d1f21e380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7718f9dc5731e0926baa072cf64aaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8c6f20589e88c58cce004fb8e07529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/838421cb33f3ced3acde9268cd2fb5b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba99a5c5661eedaef4b36ade1a7c5c5.png)
您最近一年使用:0次
名校
10 . 如图是由6个宽、高分别为
,
;
,
;
,
;…;
,
,的矩形在第一象限紧挨拼成
.显然6个矩形面积之和为
.若记
,
,则上述面积又可以写成
形式,其中代数式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8b8f0c729dba1697e8b53fcf5669b1.png)
________ .(用题目中元素
,
,
的最简形式表达)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64fcc69dc28bc11b22f5c9bec9e2aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b61e2f72b273b77d89d2a9e78db3b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428ba770e4692d7cfa88588b0f74e5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5f61fd1f2235ac43874a8fb123746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de556a8680fbbd797eed468500c42cb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d897b0f2f1ade92438efc55b8f6fbb61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8b8f0c729dba1697e8b53fcf5669b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1602c6064af12eed3fd1291f8272d93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97c28585cf80e2b403c8e23ac391573.png)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2525030760906752/2527938883158016/STEM/47940ad9b33d41c7b7f08503f4659bdc.png?resizew=154)
您最近一年使用:0次