1 . 观察下列数据:0,
,
,
,
,
,
,….根据数据排列的规律,第
个数据是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47153fdd73c0661fa460130082e30929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c194711803ea093ff6ae78984fc7f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2024-01-19更新
|
98次组卷
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2卷引用:山西省运城市夏县多校2023-2024学年八年级上学期期末数学试题
2 . 把一个分式写成两个分式的和叫作把这个分式表示成“部分分式”,请解答下列问题:
(1)若
,分别求
、
的值;
(2)根据(1)中的规律,求
的值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819f6ec80a579b595c8f648e244bf312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)根据(1)中的规律,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4f6304a2830ff624f37ef44480c80d.png)
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3 . 已知有理数
,我们把
称为
的差倒数,例如:2的差倒数是
的差倒数是
.如果![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd0b17809349399d3d5798050778894.png)
是
的差倒数,
是
的差倒数……,以此类推,那么
的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ebf5e8c5ac0fc22e01967fd0c79bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c326c425e9cd49b2ad57872ed8ffcb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ef59fb25c9976e48dfd03d72699d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd0b17809349399d3d5798050778894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510f95f4274d43853e96c594f3159a1.png)
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4 . 有一列数按一定规律排列:
….则第n个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932397e80ab04eb5bfe7d27b9981c2f8.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2024-01-10更新
|
246次组卷
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4卷引用:河北省石家庄市长安区石家庄市第八十九中学2023-2024学年七年级上学期月考数学试题
河北省石家庄市长安区石家庄市第八十九中学2023-2024学年七年级上学期月考数学试题(已下线)专题6.7 实数(知识梳理与考点分类讲解)-2023-2024学年七年级数学下册基础知识专项突破讲与练(人教版)云南省曲靖市麒麟区麒麟区第六中学2023-2024学年八年级下学期3月月考数学试题安徽省芜湖市2023-2024学年七年级下学期期中数学试题
23-24七年级下·全国·假期作业
5 . 观察下列等式,利用你发现的规律解答下列问题:
,
,
,
,
…
(1)计算:
;
(2)试比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8157dd6084fca6c997660b3e0a58275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8dd71399dbe75648dce26e02b0cb49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac61ae0b597bf0881c283ec5efed037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d596476970362a34108530edf59122.png)
…
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b887a25fb612951cca90d71ea0b52dbd.png)
(2)试比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aede0780cd0890f17c8e18c15253a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45b3483dfb1db5e62b0b2a8a08a1bea.png)
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23-24八年级下·全国·假期作业
6 . 仔细观察图形,认真分析各式,然后解答问题:
(Ⅰ)
,
,
,
,…
(Ⅱ)
,
,
,…
![](https://img.xkw.com/dksih/QBM/2023/12/27/3398110123442176/3398444967247872/STEM/26baff7aa12e49108f38b7f8f05dd07c.png?resizew=207)
(1)按以上规律,推算出
__________;
(2)按以上规律,用含
(
是正整数)的代数式表示
,
;
(3)若其中一个三角形的面积是
,它是第几个三角形?
(Ⅰ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee5747ae1c372be1170242c4aecee5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7dd6c1c4828b49d054b4acb9bec78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11219adff78788038499ad5b6073e675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb82c759dd999d703ac80449a16ee69c.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd20e09807d58bedef88befbf3f6747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9428f484974d355930da9fede3a408c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a3d3a8a1fed0fe90cf2f8c0c62ea419.png)
![](https://img.xkw.com/dksih/QBM/2023/12/27/3398110123442176/3398444967247872/STEM/26baff7aa12e49108f38b7f8f05dd07c.png?resizew=207)
(1)按以上规律,推算出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7f9c3539f3dfab16114183606ed93d.png)
(2)按以上规律,用含
![](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/337d0dc1076cfdb02ffb40bf4dac0d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)若其中一个三角形的面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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7 . 观察下列各式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21c771935207f871f494361a9732879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336269aed514ecd40a270f847c93d7eb.png)
请你根据上面三个等式提供的信息,猜想:
(1)
.
(2)请你按照上面每个等式反映的规律,写出用n(n为正整数)表示的等式 .
(3)利用上述规律计算:
(仿照上式写出过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf95b3a5cec45d465ac90ee1fd0c1917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21c771935207f871f494361a9732879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336269aed514ecd40a270f847c93d7eb.png)
请你根据上面三个等式提供的信息,猜想:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab99bc402442dce79f3ba1a99d626fc5.png)
(2)请你按照上面每个等式反映的规律,写出用n(n为正整数)表示的等式 .
(3)利用上述规律计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd0dfcff70f366dafd8cb2fd1c4bb8e.png)
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2023-12-27更新
|
126次组卷
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2卷引用:湖北省咸宁市崇阳县大集中学二分校2023-2024学年七年级下学期第一次月考数学试题
22-23七年级下·全国·课后作业
8 . 已知
,
,
,
,…,
.
定义:
,
,
,…,按此规律类推,
Sn=a1+a2+a3+…+an=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778dc8fa2140878bf8670bf79c01a39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658934b379e419c9a95b72a62c4c83ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6e8bc7ff8b9430b53fb94fcd9f5fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f87b344d6788ce20022d74ff13e5e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a051247d27d94ca427954f974e7f5b84.png)
定义:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ef4e6e5b989b593c86f8abc615fb95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ebd53812cfb6634b6880751b7e2467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadd602845bd18fa9adfc0c8cee354f3.png)
Sn=a1+a2+a3+…+an=
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名校
9 . 先观察等式,再解答问题:
①
;②
;
③
.
(1)请你根据以上三个等式提供的信息,猜想
的结果,并验证;
(2)请你按照以上各等式反映的规律,试写出用含n的式子表示的等式(n为正整数).
(3)应用上述结论,请计算
的值.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a83d389e9dc440abb356b0a0f1cdbc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d3045563c48a33bc58ec395f49c802.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b152c3b41dbaddbcbfb0405e3c19aa.png)
(1)请你根据以上三个等式提供的信息,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90504bcc7b7c4fe6c02c120e4ce25f7a.png)
(2)请你按照以上各等式反映的规律,试写出用含n的式子表示的等式(n为正整数).
(3)应用上述结论,请计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c01cde653cec762e700e9c8c61e0f1.png)
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2023-12-15更新
|
499次组卷
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6卷引用:第16章 二次根式(单元测试·拔尖卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(人教版)
(已下线)第16章 二次根式(单元测试·拔尖卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(人教版)福建省南平市光泽县第一中学2023-2024学年八年级下学期期末数学试题辽宁省葫芦岛市兴城市第二初级中学2023-2024学年八年级下学期第一次阶段练习数学试题安徽省合肥市瑶海区2023-2024学年八年级下学期期中数学试题(已下线)第12章 二次根式(单元测试·拔尖卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(苏科版)河南省郑州市郑州经济技术开发区郑州经济技术开发区第六中学2023-2024学年八年级上学期期中数学试题
10 . 阅读材料并解决问题:
求
的值.
令
,等式两边同时乘2,则
,
两式相减得
,所以
.
依据以上计算方法,计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f8f8300dd7b6c3a98018d1f9817a7c.png)
________ .
求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b61b0fcf02d4435d74196901285bc72.png)
令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cb84a482cd21587c12f56624d17cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4825b6762e4eb03f548278b0b6439e8f.png)
两式相减得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa19d7f3930366e301cf8f7b61ec8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2147e73b499dc252c37b3d419b8cf918.png)
依据以上计算方法,计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f8f8300dd7b6c3a98018d1f9817a7c.png)
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