1 . 观察下列算式,找出规律并填空.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536b0d1e9014cc155da03098fc7729ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d3a782ef6dc771a6460dcd0f0345a0.png)
......
第十个算式是 .
根据以上规律计算:
(1)
的值.
(2)
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536b0d1e9014cc155da03098fc7729ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d3a782ef6dc771a6460dcd0f0345a0.png)
......
第十个算式是 .
根据以上规律计算:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a4c119f847d33de3f5013473df0392.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea8201bed7c3248357897e38e98b0ba.png)
您最近一年使用:0次
2 . 在下表中,我们把第i行第j列的数记为
(其中i,j都是不大于5的正整数),对于表中的每个数
,规定如下:当i≥j时,
=l;当i<j时,
=0.例如:当i=2,j=1时,
=
=1.按此规定,
=______;表中的25个数中,共有_______个1;计算
+
·
+
·
+
·
+
·
的值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ba1bbe411bc71bca016d3fd82352f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ba1bbe411bc71bca016d3fd82352f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ba1bbe411bc71bca016d3fd82352f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ba1bbe411bc71bca016d3fd82352f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ba1bbe411bc71bca016d3fd82352f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3a2788d822e8ab9136e44367a9c982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c17bcc9a3072725046d28b130491b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fccdc3a09cfdfc331174b9b535ea3aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40629807d769058aa0149feebe3cc2ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de554d045e9b6b34502c65e0841f6997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c17bcc9a3072725046d28b130491b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9422f67ee732416763760e96f5bd2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39c64aaaa155130d963cae78bcd37b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ac802d3623ac544c1081ef82a1c7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ecacbf27740612cf7b3ec86d562fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778c71b413147c9cfa95a882946a9d88.png)
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3 . 化简求值:
+![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3fa70269793147abd404273976ac174.png)
+…+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff2b0ed143728c0e6187ee8eae3d575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3fa70269793147abd404273976ac174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef6649eb2ee8697bc921a465944730f.png)
您最近一年使用:0次
名校
4 . 观察下列各数,按照某种规律在横线上填上一个适当的数,
,
,
,
,
,_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602baac86c2b1668ecdfadc8a5948885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97568ee5c7cd94ac11b9574be348d647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6d25193989aab18c862925bad9112e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f6bb042a5ce45b0a8e8b65c52ac8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868238425883515c6e370b7872e7e0c8.png)
您最近一年使用:0次
2019-10-01更新
|
332次组卷
|
7卷引用:浙江省义乌市2019-2020学年上学期第一次质量检测七年级数学试卷
5 . 请先阅读下列一组内容,然后解答问题:
因为:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a408549e1e1e60325cfc33406d08e45.png)
所以:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef72ba2f44e11a3226f4b1db7ea6ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ef8d386b3af1309841ae09818cd4d7.png)
计算:①
②
因为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a408549e1e1e60325cfc33406d08e45.png)
所以:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef72ba2f44e11a3226f4b1db7ea6ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7352f3c8df3920ab53e00ed0b9ef15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61d563ca2e99648d5dca387051a5ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ef8d386b3af1309841ae09818cd4d7.png)
计算:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c8d06d016de3fab51d68e17e2cf6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd034bed48b608cc68ac319116804295.png)
您最近一年使用:0次
2019-10-01更新
|
290次组卷
|
11卷引用:2014-2015学年四川省广安市白庙督导区七年级10月月考数学试卷
2014-2015学年四川省广安市白庙督导区七年级10月月考数学试卷2015-2016学年湖南省邵阳市邵阳县石齐学校七年级上期中数学试卷重庆市綦江县石角中学2017-2018学年七年级(上)期中数学试卷陕西省70中2017-2018学年七年级上学期第一次月考数学试题广东省深圳市罗湖区罗湖区银湖外国语实验学校2019-2020学年七年级上学期9月月考数学试题湖北省武汉市江汉区2部分学校2019-2020学年七年级10月月考数学试题甘肃省定西市临洮县2020-2021学年七年级上学期期中数学试题广东省深圳市福田区实验教育集团翰林学校2020-2021学年七年级上学期阶段测试数学试题辽宁省盘锦市大洼区大洼区第一初级中学2022-2023学年七年级上学期第一次月考数学试题广东省深圳市龙岗区平安里学校2023-2024学年七年级上学期第一次月考数学试题江西省上饶市2023-2024学年七年级上学期期中数学试题
6 . 观察下列等式:
第1个等式
;
第2个等式
;
第3个等式
;……
请回答下列问题:
(1)按照以上的规律列出第
个等式:
= = ;
(2)用含有
的代数式表示第
个等式:
(
为正整数);
(3)求
…
的值.
第1个等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f755354b0d8a7afcd28b5552b5e40029.png)
第2个等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe707d7f8f1df55014b17e6c1a01e8d.png)
第3个等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4db8989fdb9ee24978e31f6c85d7145.png)
请回答下列问题:
(1)按照以上的规律列出第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
(2)用含有
![](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/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a52ccc865ef0d4b98f1d7bf4a3c7a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5195ee2d0bc7e2986113be19bb952003.png)
您最近一年使用:0次
19-20八年级上·四川成都·开学考试
7 . 已知一列数:a1=2,a2=a1+4,a3=a2+6,……,an=an﹣1+2n(n为正整数,n≥2),
(1)a4的值是_____ ;
(2)当n=2018时,则an﹣37n+324的值是_____ .
(1)a4的值是
(2)当n=2018时,则an﹣37n+324的值是
您最近一年使用:0次
8 . 已知
=3×2=6,
=5×4×3=60,
=5×4×3×2=120,
=6×5×4×3=360,依此规律
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e8b4df04cab76a07f9e07968f81ba8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18973d8d3a38388b313508a25b7c692e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44cd402273d13e7298a2bdd0336077de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d6b2372711579120172fd56e24d77c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4638f5031256476f7e6a0fc287530c.png)
A.820 | B.830 | C.840 | D.850 |
您最近一年使用:0次
2019-09-19更新
|
328次组卷
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3卷引用:福建省福鼎市求新中学2019-2020上学期九年级数学开学考试试题
9 . 观察下列各式:2×4=32﹣1,3×5=42﹣1,4×6=52﹣1,…,10×12=112﹣1,…,将你猜想到的规律用只含一个字母的式子表示出来:_____ .
您最近一年使用:0次
2019-09-16更新
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179次组卷
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2卷引用:河南省平顶山市2018-2019学年八年级下学期期中数学试题
10 . (1)计算并观察下列各式:
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59ff2252371c6dbcfcc4e0799d9ee5.png)
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c558a155528ad2d38d98d44acffe6a9.png)
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35191372d1b6a80a234623c8364cc11.png)
(2)已知
,那么
_________.
(3)从上述过程中你发现了什么规律?请用含
的代数式表示出来,并说明理由.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59ff2252371c6dbcfcc4e0799d9ee5.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c558a155528ad2d38d98d44acffe6a9.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35191372d1b6a80a234623c8364cc11.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d750612dc04f0945ae1fb2be61f025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54edd18c9583429201fa0310bf8dcf6c.png)
(3)从上述过程中你发现了什么规律?请用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2019-09-12更新
|
306次组卷
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3卷引用:北师大版八年级上第七章 7.1 为什么要证明