观察下面依次排列的一些数:
,
,
,
,
,
,⋯
猜测排列的规律,并回答下列问题.
(1)第7个数是 ,第8个数是 .
(2)第2023个数是 .
(3)如果这列数依据这个规律无限排列下去,与哪个整数越来越接近?直接写出这个整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602baac86c2b1668ecdfadc8a5948885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf3f23bfec394769b4670962b219999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
猜测排列的规律,并回答下列问题.
(1)第7个数是 ,第8个数是 .
(2)第2023个数是 .
(3)如果这列数依据这个规律无限排列下去,与哪个整数越来越接近?直接写出这个整数.
22-23七年级上·浙江杭州·期中 查看更多[2]
更新时间:2022-11-08 14:54:15
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相似题推荐
解答题-问答题
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解题方法
【推荐1】把几个数用大括号围起来,中间用逗号断开,如:{1,2,-3},我们称之为集合,其中的数称其为集合的元素.如果一个集合满足:当有理数
是集合的元素时,有理数
也必是这个集合的元素,这样的集合我们称为至尊集合 .例如:集合{9,0}就是一个至尊集合.
(1)请你判断:集合{-1,9}________至尊集合,集合{-8,1,4.5,8,17)________至尊集合(以上两个空格填“是”或“不是”);
(2)请你写出所有至尊集合中,元素个数最少的集合________;请你再写出一个至少含有三个元素的至尊集合________;
(3)若集合
是至尊集合,则
________;若集合
是至尊集合,则
________;
(4)若某个至尊集合中含有
个元素,求这
个元素的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0393362164b0cf96bc3039f95f01ce.png)
(1)请你判断:集合{-1,9}________至尊集合,集合{-8,1,4.5,8,17)________至尊集合(以上两个空格填“是”或“不是”);
(2)请你写出所有至尊集合中,元素个数最少的集合________;请你再写出一个至少含有三个元素的至尊集合________;
(3)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be49c1c2f996b9ab0928c9de613eae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfaba3c29159a45817ce86a2fe9e125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc19b606ad14f6d02264778a3d18d211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24da4098819485df9e82961fc828deb2.png)
(4)若某个至尊集合中含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-计算题
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【推荐2】已知一组数
,-
,
,-
,…,
(从左往右数,第1个数是
,第2个数是-
,第3个数是
,第4个数是-
,依此类推,第n个数是
).
(1)分别写出第5个、第6个数;
(2)记这组数的前n个数的和是sn,如:
s1=
(可表示为1+
);
s2=
+(-
)=
(可表示为1-
);
s 3=
+(-
)+
=
(可表示为1+
);
s4=
+(-
)+
+(-
)=
(可表示为1-
).
请计算S99的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc0f4e88a98b2b25320e4bed691342b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba41326ace4fd1efc70177ed3dbf323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54264c10f6c446571066ef4c0dadb953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc0f4e88a98b2b25320e4bed691342b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba41326ace4fd1efc70177ed3dbf323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54264c10f6c446571066ef4c0dadb953.png)
(1)分别写出第5个、第6个数;
(2)记这组数的前n个数的和是sn,如:
s1=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
s2=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
s 3=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc0f4e88a98b2b25320e4bed691342b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
s4=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc0f4e88a98b2b25320e4bed691342b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba41326ace4fd1efc70177ed3dbf323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
请计算S99的值.
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【推荐1】(1)观察下列算式:
1=12, 1+3=4=22 , 1+3+5=9=32,1+3+5+7=16=42……
按规律填空:①1+3+5+7+9= ;②1+3+5+…+2005=
(2)已知a、b互为相反数,c、d互为倒数,求
的值;
1=12, 1+3=4=22 , 1+3+5=9=32,1+3+5+7=16=42……
按规律填空:①1+3+5+7+9= ;②1+3+5+…+2005=
(2)已知a、b互为相反数,c、d互为倒数,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0215de9e04316487d5a81b2d9da1737.png)
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【推荐2】比较
与
的大小,我们可以采用从“特殊到一般”的惠想方法:
(1)通过计算比较下列各式中两数的大小;(填“>”“<”或“=”)
①
___
,②
___
,③
___
,④
___
;
(2)由(1)可以猜测
与
(
为正整数)的大小关系;
当
___ 时,
;当
___时,
;
(3)根据上面的猜想,则有
___
(填“>”,“<”或“=”).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24b77f256fc0c137bdc6cb6e1cabaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a662785a73c304a240f4e2ccc30a6982.png)
(1)通过计算比较下列各式中两数的大小;(填“>”“<”或“=”)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad38fd0e072cd7b6e089ad1db213649c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/005505971c871db31b5892937ed50ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b4299339d0bbae028ed4af98344936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/730a10b6787141963cdd07439147e063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0f3f77290b6dc7d204eb620701bd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6691fed5fd54ed744c7c1fdcfb826bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919cb3148346d9a89bc465fd9a8cbe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502c167638cc0ac23e419abedd6c7380.png)
(2)由(1)可以猜测
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcbcd520f8ffc54d21941c78f1f6347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93a35a6475adef3c517d6e82a7f9f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b93809d948da2fc7d67ce90ea78be4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d54228fb2b58143095e84841c320dc0.png)
(3)根据上面的猜想,则有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24b77f256fc0c137bdc6cb6e1cabaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a662785a73c304a240f4e2ccc30a6982.png)
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