1 . 课堂上学习了勾股定理后,知道“勾三、股四、弦五”.王老师给出一组数让学生观察:
;
;
;
;…,学生发现这些勾股数的勾都是奇数,且从3起就没有间断过,于是王老师提出以下问题让学生解决.
(1)请你根据上述的规律写出下一组勾股数:
、 、 ;
(2)若第一个数用字母a(a为奇数,且
)表示,那么后两个数用含a的代数式分别怎么表示?聪明的小明发现每组第二个数有这样的规律:
,
,
……,则用含a的代数式表示每组第二个数和第三个数分别为 、 ;
(3)用所学知识加以说明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c0d2f30e05bcaa4135e392287cbe7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2828fe4821b9125ddaca5143b1b00771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d080d26511d92b9a4e7f0bc41b772b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e7919598ec7b80f9be2a02e5a2e97a.png)
(1)请你根据上述的规律写出下一组勾股数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
(2)若第一个数用字母a(a为奇数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a671406a5442a3088a4ee1d064114a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765159f16346345e8b5a7b726cf35d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678abf7f12a3fcf0f606cfddb88c70a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6754dc6dd35697b10fc2618e8fc9e9cc.png)
(3)用所学知识加以说明.
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22-23八年级下·全国·单元测试
2 . 细心观察所给图形,认真分析各式,然后回答问题:
,
;
,
;
,
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://img.xkw.com/dksih/QBM/2023/1/5/3146297775087616/3146502183731200/STEM/10f6da76c8bb4fe9973a877550ff6eaa.png?resizew=241)
(1)请用含
(
是正整数)的等式表示上述变化规律;
(2)推算出
的长;
(3)求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cefc35d4b3a49540b17469f8567a066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4f48b72329a258cf2c82273574a208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c4c051cff7a46258bbaf24758ffaf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554a870ba0c66752f89e00ae26cc7646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/725d9db5e15b77df6d5fe8fb908c6ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51417ed5c9681fc9901174af61e2ec91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://img.xkw.com/dksih/QBM/2023/1/5/3146297775087616/3146502183731200/STEM/10f6da76c8bb4fe9973a877550ff6eaa.png?resizew=241)
(1)请用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)推算出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd5fc72a200a878fadf801e72d2c875.png)
(3)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed48b4767ffa8ae878091acee06b555a.png)
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22-23八年级下·全国·单元测试
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3 . 细心观察如图,认真分析各式,然后解答下列问题:
,
(
是
的面积);
,
(
是
的面积);
,
(
是
的面积);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f782d70309802445202487eee751cbdd.png)
(
为正整数)的式子填空:
_______,
_______;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050a73bb8b76ebafba1f7e3877e65ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4f48b72329a258cf2c82273574a208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7334b09e1c6156c0d1c7f8b2150e320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6325e81fd49d815502c58aed4e68554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554a870ba0c66752f89e00ae26cc7646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523298e1c78c8de655f63541f63b9aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb802b0025c1d420dee8a67b21dec546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51417ed5c9681fc9901174af61e2ec91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6f15c6a94b97371e3b4c93c3e59bb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f782d70309802445202487eee751cbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5f32f8270dbaaaba8b08df4ec9d3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b89dbc751fbde0e9ba146ece02d642.png)
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5卷引用:第17章 勾股定理(A卷·知识通关练) -【单元测试】2022-2023学年八年级数学下册分层训练AB卷(人教版)
(已下线)第17章 勾股定理(A卷·知识通关练) -【单元测试】2022-2023学年八年级数学下册分层训练AB卷(人教版)(已下线)第1章 二次根式 章末检测卷-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(浙教版)(已下线)第12章 二次根式 单元综合检测(题型专训)-2022-2023学年八年级数学下册同步精品课堂(苏科版)四川省成都市简阳市雷家学校2023-2024学年八年级上学期期中数学试题山东省日照市东港区实验中学2023-2024学年八年级下学期4月月考数学试题
4 . 观察下列等式:
,
,
,
,……,这些等式反映正整数间的某种规律,设
表示自然数,用关于n的等式表示这个规律为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31bc57adca64e57a04f63ca153cbbcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6511037df70f4374da25ab4092a91226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3572ba765c26bb26943961a16c888720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2f340b23f3ceb2673f24474edc2909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bfe05ef6780e5f032ca3a7c96811a6.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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5 . 观察下面的“蜂窝图”,是由六边形按一定的规律组成的.其中第1个图形中有4个六边形,第2个图形中有7个六边形,第3个图形中有10个六边形,…,按此规律,则有1564个六边形的图形是( )
![](https://img.xkw.com/dksih/QBM/2022/11/30/3120732922961920/3127086090780672/STEM/940a29fb6bcf4998b2d0cb83785e8f65.png?resizew=550)
![](https://img.xkw.com/dksih/QBM/2022/11/30/3120732922961920/3127086090780672/STEM/940a29fb6bcf4998b2d0cb83785e8f65.png?resizew=550)
A.第521个 | B.第522个 | C.第523个 | D.第524个 |
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2022-12-09更新
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3卷引用:重庆市江津区12校联盟学校2023-2024学年八年级上学期期中考试数学试题
6 . 我国宋代数学家杨辉发现了
(
,1,2,3,…)展开式各项系数的规律:
![](https://img.xkw.com/dksih/QBM/2022/11/17/3111728214335488/3116789225684992/STEM/7179293279154f69bfc94a8de42d2626.png?resizew=550)
以上系数三角表称为“杨辉三角”,根据上述规律,
展开式的系数和是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5abcb3802cf02be93a8c89067bd49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd09fb9482124fd35f19b86894648f4.png)
![](https://img.xkw.com/dksih/QBM/2022/11/17/3111728214335488/3116789225684992/STEM/7179293279154f69bfc94a8de42d2626.png?resizew=550)
以上系数三角表称为“杨辉三角”,根据上述规律,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83aeab3328d42f2fd52bbf80d9f0c708.png)
A.64 | B.128 | C.256 | D.512 |
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2022-11-24更新
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名校
7 . 如下图,
的面积为1,分别倍长(延长一倍)
,
,
得到
,再分别倍长
,
,
得到
.…按此规律,倍长2020次后得到的
的面积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cabc3303519ac16fc998913ad9f349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b50e6ac32d0bec074fef500ece4c55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/1d14b9de-262f-46db-b87b-cb884b8c183c.png?resizew=227)
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3卷引用:广东省广州市2023-2024学年八年级上学期期中模拟数学试题
8 . 阅读理解并回答问题.观察下列算式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21417fb83fea5b2737a5a2216574110a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c38e25cf4d1401ec555ee9497ae4f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f80510e9009407eb0fd09c359058b8b.png)
……
(1)填空:
= = ;
(2)请用含有m(m表示整数)的代数式表示上述式子特点的一般规律: .
(3)请用(2)中的规律解方程:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21417fb83fea5b2737a5a2216574110a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c38e25cf4d1401ec555ee9497ae4f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f80510e9009407eb0fd09c359058b8b.png)
……
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543c342022938a3bc0366498c07b6778.png)
(2)请用含有m(m表示整数)的代数式表示上述式子特点的一般规律: .
(3)请用(2)中的规律解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40760c9c8a78a9e71a3afd1fc46725c3.png)
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5卷引用:湖南省怀化市雅礼实验学校2023-2024学年八年级上学期期中数学试题
9 . 如果一个正整数能表示为两个连续偶数的平方差,那么称这个正整数为“奇巧数”,如
,
,
,
,因此
,
,
这三个数都是奇巧数.
(1)
是奇巧数吗?为什么?
(2)设两个连续偶数为
,
其中
为正整数
,由这两个连续偶数构造的奇巧数是
的倍数吗?为什么?
(3)小明观察猜想任意两个连续“奇巧数”之差是同一个数,小明的猜想正确吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22fd5165234ab1de380aa9a54938408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b879e03e92e3df8183f8e2c76029e617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e5ad1e915bb13fe6a0991759000e65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e61680ffc6f940bd5b8afda3ae9c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f179a5e46197a7f5f5646fefd47c1989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1835e4f4b1b030477f65dabd16ce080.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764a6e891b10908e6268785f778e78a7.png)
(2)设两个连续偶数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212b97a1d6785f21e8559809efc0ea47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35df2983f39cd20929bed4a34e1e7645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
(3)小明观察猜想任意两个连续“奇巧数”之差是同一个数,小明的猜想正确吗?请说明理由.
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10 . 观察下列等式:
;
;
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
(1)写出式第
个等式:______;
(2)写出第
个等式,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c6af1bcc614ff63b1686131609a5da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e466db31986506150b01fa6ccd492d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8778f97ec1447dec9188aad5d16bd6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
(1)写出式第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
(2)写出第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2022-09-21更新
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9卷引用:专题1.20 二次根式(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)
(已下线)专题1.20 二次根式(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)专题16.20 二次根式(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(沪科版)(已下线)专题16.20 二次根式(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)安徽省亳州市高炉学校2022-2023学年八年级下学期第一次月考数学试卷江西省上饶市余干县2022-2023学年八年级下学期期中数学试题江西省上饶市广信区2022-2023学年八年级下学期期中数学试题安徽省宣城市第六中学2021-2022学年八年级下学期期中数学试题安徽省皖东南初中四校2023-2024学年八年级下学期期中数学试题(已下线)安徽省八年级下学期期中必刷基础60题(31个考点专练)-2023-2024学年八年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(沪科版)