1 . 已知数列1,1,2,1,2,4,1,2,4,8,1,2,4,8,16,…,其中第一项是
,接下来的两项是
,
,再接下来的三项是
,
,
,依此类推,则该数列的前94项和是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad4668cc927e277289b2af718f0d91.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 某同学在一次研究性学习中,发现以下五个式子的值都等于同一个常数.
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9006fead1291fcf152901ff313537dbf.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b9fb85b82ffe399b25c07fdef16aa7.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd829ddf567e3436ed6602028b199114.png)
(4)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362fcceb6b6bb845bf94a453090c0e18.png)
(5)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85cef197131a3d415b4e8f4af76e699.png)
(1)试从上述五个式子中选择一个,求出这个常数;
(2)根据(1)的计算结果,将该同学的发现推广为三角恒等式,并证明该结论.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9006fead1291fcf152901ff313537dbf.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b9fb85b82ffe399b25c07fdef16aa7.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd829ddf567e3436ed6602028b199114.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362fcceb6b6bb845bf94a453090c0e18.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85cef197131a3d415b4e8f4af76e699.png)
(1)试从上述五个式子中选择一个,求出这个常数;
(2)根据(1)的计算结果,将该同学的发现推广为三角恒等式,并证明该结论.
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3 . 设
(其中
,
为实数),
,
,
,若
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafb56898192415349f6dbc20ff1f502.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/f66a88cbaed58dcf9671ba9240359b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47758fd032883f8fbded2ca2fe374df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414f4f53b4ae5085836107278784e3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5f81d3848e0e2a0432df42141a9d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df52d906a1c0a895fb72a86a977f67fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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4 . 如图,有一个六边形的点阵,它的中心是1个点(算第1层),第2层每边有2个点,第3层每边有3个点,…,依此类推,如果一个六边形点阵共有169个点,那么它的层数为__________ .
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979828065763328/1981786061258752/STEM/f32bd54e7e4649b5a84c4bfefa976861.png?resizew=118)
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5 . 当
时,可以得到不等式
,
,
,由此可以推广为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e989c65b1aaa8812e0e8bb6983c2bd0.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb005769d5478c56fc5a01d824167d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63af71b9e6f71cd26e6e97541154cd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9caafdc3771dd6d3c7828a70bebee2bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e52cac635d52c514fc8cec1271e66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e989c65b1aaa8812e0e8bb6983c2bd0.png)
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6 . 给出以下数对序列:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c832f2474efe89961ef41e884da7660c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0c810c8a393da8ada5a855738865b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5911a41d6c75e304eb2ecb2b060ad74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee6073adf4c57b4d5907f9e79cbdacf.png)
……
记第
行的第
个数对为
,如
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df31e80f7f07ee8073d315bac82103b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c832f2474efe89961ef41e884da7660c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0c810c8a393da8ada5a855738865b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5911a41d6c75e304eb2ecb2b060ad74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee6073adf4c57b4d5907f9e79cbdacf.png)
……
记第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1f602bdec88645c52034d0308f24ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df31e80f7f07ee8073d315bac82103b3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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安徽省滁州市定远县西片三校2017-2018学年高一4月月考数学试题湖南省永州市祁阳县第一中学2018届高三10月月考数学(文)试题吉林省东丰县第三中学2017-2018学年高二下学期期中考试数学(文)试题【校级联考】河南省豫南九校2018-2019学年高二下学期第二次联考数学(文)试题步步高高二数学暑假作业:【文】作业19 推理与证明、算法初步、复数步步高高二数学暑假作业:【理】作业20 推理与证明、算法初步、复数福建省莆田第八中学2018-2019学年高二下学期期中数学(文)试题天津市静海县第一中学2017-2018学年高二6月学生学业能力调研数学(理)试题辽宁省营口市部分重点高中2017-2018学年高二下学期期中考试数学(文)试题
7 . 中国古代十进位制的算筹记数法,在世界数学史上是一个伟大的创造.算筹记数的方法是:个位、百位、万位……的数按纵式的数码摆出;十位、千位、十万位……的数按横式的数码摆出. 1~9这9个数字的纵式与横式表示数码如下图所示:
![](https://img.xkw.com/dksih/QBM/2020/2/19/2402335031967744/2402494237130752/STEM/78d61032adf84d919c36b752a32f9554.png?resizew=315)
如138可用算筹表示为
,则
的运算结果可用算筹表示为______ .
![](https://img.xkw.com/dksih/QBM/2020/2/19/2402335031967744/2402494237130752/STEM/78d61032adf84d919c36b752a32f9554.png?resizew=315)
如138可用算筹表示为
![](https://img.xkw.com/dksih/QBM/2020/2/19/2402335031967744/2402494237130752/STEM/d3c3338089734f16ac0d282190248a9d.png?resizew=25)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3c6c3995634f983bdc86c0e470e6da.png)
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8 . 设
是从
,0,1这三个整数中取值的数列,若
,且
,则
中数字0的个数为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5480acf4c2b3b4e5fae8a741938064b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d64e9ae6f3c42a49f78a9c49fa407ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2068416c69cadd682cfa2e13e21736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5480acf4c2b3b4e5fae8a741938064b6.png)
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9 . 观察下列数的规律:
,则第9个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0213cfde61b1e67c744d80e363f8c3e.png)
A.21 | B.22 | C.33 | D.34 |
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10 . 将全体正整数排成一个三角形数阵:
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485420200779776/2486016856596480/STEM/fb70d1857d414f248c1de7e7247895e6.png?resizew=123)
按照以上排列的规律,第10行从左向右的第2个数为
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485420200779776/2486016856596480/STEM/fb70d1857d414f248c1de7e7247895e6.png?resizew=123)
按照以上排列的规律,第10行从左向右的第2个数为
A.47 | B.36 | C.45 | D.68 |
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