1 . 观察下列运算:
①由
,得
;
②由
,得
;
③由
,得
.
(1)通过观察,将你发现的规律用含有
的式子表示出来,并注明
的取值;
(2)利用你发现的计算
.
①由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916801280e639ddc0700afba2adfe28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46916ae4936e634cd05abc59f5a6246e.png)
②由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8e46976fa60bacb93dca7af921bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c64e7bdb41d097a271b68f9ede41c7bc.png)
③由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed79024949e5704ca4f71aebb0934464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd10d410047ebef943410ff67882cad.png)
(1)通过观察,将你发现的规律用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)利用你发现的计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32f7b7d6bbb1ce8f2e7df367c64dd5d.png)
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2 . 如图,动点P在平面直角坐标系中按图中箭头所示方向运动,第1次从原点运动到点
,第2次接着运动到点
,第3次接着运动到点
…按这样的运动规律经过第2023次运动后,动点P的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9311b13eb2baab6641da9e7b48e13e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0573e2af8a0dc8c6a1c0af067a324f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b4d87e5352d9322009e4d62b797c1e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
3 . 如图,在平面直角坐标系中,点A在y轴的正半轴上,
,将
绕点O顺时针旋转
到
,扫过的面积记为
,
交x轴于点
;将
绕点O顺时针旋转
到
,扫过的面积记为
,
交y轴于点
;将
绕点O顺时针旋转
到
,扫过的面积记为
,
交x轴于点
;……;按此规律,则
的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4195334905e2f190f958dbf5951456f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bfa916d4cb008111120a8e7728402cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76916c6ff302cf4fb4b6ace5bb3a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181f7b988095b7285557491c7bb2fb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94898fe181e671162fcb07c84267aeb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bfebbfa1df7fa250fab46751b8c52a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f346cb68d9fba5dc43b0c48516a5f543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7f3f555a8f181b0607d4a58873343e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f762938f5c78eb72bafbb13bf85cba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addee6ce5163a2580888ce2da22714af.png)
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2024-06-08更新
|
113次组卷
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3卷引用:2024年山东省济宁市三维斋中考三模数学试题
名校
4 . 将一些棋子按如图所示的规律摆放,若在某个图中棋子的个数恰好为160个,则这个图的序号是______ .
您最近一年使用:0次
2024-06-02更新
|
88次组卷
|
2卷引用:山东省烟台市芝罘区烟台第十四中学2023-2024学年八年级下学期期中数学试题
5 . 我国古代数学的许多创新和发展都位居世界前列,如南宋数学家杨辉(约13世纪)所著的《详解九章算法》一书中,用如图的三角形揭示
(n为非负整数)的展开式的项数及各项系数的有关规律,此三角形称为“杨辉三角”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3eed4e0751362b9a41db30d8b0d760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d7835b3630c2cffb3434efbf7a1af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375d440fa0c1da0617388f0fc270542c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ceefbef8fc285bf1db6d0527e3f4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce92c8101366cb088847ff1720f16b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06e7d0b352f43d4b42097b43d8e2c86.png)
…
的展开式中第三项的系数为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0034de31c6d9f4412cf54a01160c3573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3eed4e0751362b9a41db30d8b0d760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d7835b3630c2cffb3434efbf7a1af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375d440fa0c1da0617388f0fc270542c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ceefbef8fc285bf1db6d0527e3f4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce92c8101366cb088847ff1720f16b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06e7d0b352f43d4b42097b43d8e2c86.png)
…
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1fdf8db64ff5dc5ad07ddf731c7269.png)
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6 . 观察下列图形:若
,在第
个图中,可得
,则按照以上规律,
________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f6bed282721b697998bc651a4c1516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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7 . 烷烃是一类由碳、氢元素组成的有机化合物,在生产生活中可作为燃料、润滑剂等原料,也可用于动、植物的养护。通常用碳原子的个数命名为甲烷、乙烷、丙烷、……、癸烷(当碳原子数目超过10个时即用汉文数字表示;如十一烷、十二烷……)等,甲烷的化学式为
,乙烷的化学式为
,丙烷的化学式为
……,其分子结构模型如图所示,按照此规律,十六烷的化学式为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a5c8a45b70251a7fa0506a5b4b8ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5805b8c82259f32c7f04717168181791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/664aa41ab989d20e9d13587f6677a6f1.png)
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8 . 如图,在平面直角坐标系
中,
,
,
,
是边长为1个单位长度的小正方形的顶点,开始时,顶点
,
依次放在点
,
的位置,然后向右滚动,第1次滚动使点
落在点
的位置,第2次滚动使点
落在点
的位置,…,按此规律滚动下去,则第2025次滚动后,顶点
的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32d26c8d44f5fb4813a19c1030a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0573e2af8a0dc8c6a1c0af067a324f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb442fb1fe1a5d9768cf11c3e1b7ec5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfa2a6d9749a619edf80bad8b3e4962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 小亮同学喜欢研究数学问题.他在一本资料中看到一个新的数学概念“对角线互相垂直且相等的四边形叫做垂等四边形”,并对垂等四边形进行了研究.具体内容如下:
【理解应用】
(1)如图1,在平面直角坐标系
中,已知四边形
是垂等四边形,点
的坐标为
,点
的坐标为
,求点
的坐标;
(2)如图2,正方形
的边长为
,点
在边
上,点
在边
上,点
在边
上,点
在边
上,若四边形满足
,请直接写出四边形
面积
的取值范围;
(3)如图3,已知抛物线
与
轴交于
、
两点,点
在点
的左侧,
、
两点在该抛物线上.若以
、
、
、
为顶点的四边形是垂等四边形且
.设点
的横坐标为
,点
的横坐标为
,且
,求
的值.
【理解应用】
(1)如图1,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfa2a6d9749a619edf80bad8b3e4962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fed700b7a3ab2ee7fbae12507033af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9016de3d17a389fb5d0952f616c19e0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)如图3,已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966a7257fd3af3a4049844773c611e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091d529281abff275ef19b9197445a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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10 . 我们知道
,因此将
的分子、分母同时乘“
”,分母就变成了1,原式可化简为
,所以有
.
请仿照上面的方法,解决下列问题:
(1)化简:
;
(2)若
,
,求代数式
的值;
(3)根据以上规律计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f559ffccc3e093af2d645332509a1326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a91c33ebbacfc3e46515737af771e9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53204688086b1d0111e91cb49fa0ac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53204688086b1d0111e91cb49fa0ac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca84e2db65efe3647aba894f55071678.png)
请仿照上面的方法,解决下列问题:
(1)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a26f4e9ef49148838ca5e1f69dfeb2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e72f6014a40e11f685816d89a12fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3229d713beb19a5437efcda9ba71c78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d22c114a13cd86429abe03be114dc19.png)
(3)根据以上规律计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a05df1efa8ab735720515edf5bca6910.png)
您最近一年使用:0次
2024-05-18更新
|
71次组卷
|
2卷引用:山东省日照市岚山区2023-2024学年八年级下学期期中数学试题