1 . 用大小相同的圆点摆成如图所示的图案,按照这样的规律摆放,则第
个图案中共有圆点的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/309cde08-8351-473e-a022-fd3556b3cdc8.png?resizew=448)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/309cde08-8351-473e-a022-fd3556b3cdc8.png?resizew=448)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 将正整数1至2023按照从左到右的顺序填入下面表格中:
规定:
表示第m行第n个数,如
表示第3行第2个数是20,记作
.
(1)
______;
(2)若
,则
______,
______;
(3)将表格中的“T”型格子看成一个整体并可以平移,所覆盖的4个数之和能否等于113?如果能,求出4个数中的最小数;如果不能,请说明理由;
(4)用含m、n的代表表示
______.
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 |
… |
规定:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff1f31ff1a97ec4907609992df726f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2284f4d6ecb00ba049df932473ad0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1420a8aa80af6584bd435691c4cb7a0.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa089a22e818f1ea4389eacfbfc03db1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90b85b696ea6b418e14e9544b2b821f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(3)将表格中的“T”型格子看成一个整体并可以平移,所覆盖的4个数之和能否等于113?如果能,求出4个数中的最小数;如果不能,请说明理由;
(4)用含m、n的代表表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9fb8cfacbd0eea27aef997f02b6e8d.png)
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3 . 把正奇数
,
,
,
,
排成如图所示的
列,规定从上到下依次为第
行,第
行,第
行,
,从左到右依次为第
列至第
列.回答如下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/35dcf5b8-592b-49b9-9860-89aa60239588.png?resizew=227)
(1)①图表中第
列第
行的数为_____;
②图表中第
行第
列的数可表示为_____.(用含有
的代数式表示,要求化为最简形式)
(2)按如图所示的方法用一个“
”形框框住相邻的三个数,设被框的三个数中,最小的一个数为
,是否存在这样的
,使得被框的三个的数和等于
?若存在,求出
的值,若不存在,请说明理由.
(3)若在(2)中“
”形框框住的三个数的和记为“
”,则
的最大值与最小值的差等于_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f782d70309802445202487eee751cbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2030a7c508abe4b2a03bc702cf7692d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f782d70309802445202487eee751cbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/35dcf5b8-592b-49b9-9860-89aa60239588.png?resizew=227)
(1)①图表中第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
②图表中第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)按如图所示的方法用一个“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa83681a17608a1784ae1df4682f5c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若在(2)中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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4 . 观察下列三行数:
①2,4,6,8,…
②
,
,
,
,
,…
③0,5,10,15,20,…
(1)第①行的第9个数是________,第
个数是________;
(2)第②行的第
个数是________,第③行的第
个数是________;(用含n的代数式表示)
(3)如图,用一个长方形方框框住六个数,左右移动方框,框住的六个数之和可以用含n的代数式表示.则当
时,框住的六个数字之和为___________.(直接写出结果即可)
①2,4,6,8,…
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf3d3564c61e5e9c39a9e2cf2de048b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eed5ece335b63af168c7c36d2121947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f88b597e0729b052743f9d8b7923b28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4014daff61e2c227e7a38e4caf3a82e8.png)
③0,5,10,15,20,…
(1)第①行的第9个数是________,第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)第②行的第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)如图,用一个长方形方框框住六个数,左右移动方框,框住的六个数之和可以用含n的代数式表示.则当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c91fd038f8b7ab27b1913f92d2930c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/c45c4b34-fb90-4352-92a0-ad8f352c563b.png?resizew=252)
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5 . 小明同学在查阅大数学家高斯的资料时,知道了高斯如何求
.小明于是对从
开始连续奇数的和进行了研究,发现如下式子:
第1个等式:
;
第2个等式:
;
第3个等式:
;
探索以上等式的规律,解决下列问题:
(1)
;
(2)完成第n个等式的填空:
;
(3)利用上述结论,计算
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c66d74ddacd376a3936706fabf015fd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
第1个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1db1c8f88c5de20586db0cde44d3e28.png)
第2个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194969148c9c1b7df23d1c65f16767da.png)
第3个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c94bed97397edf43702cba40b6aec6.png)
探索以上等式的规律,解决下列问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c63ffa335de0a9e54a779bbfa43e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
(2)完成第n个等式的填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9afd853e8215cb0486132e473cf9667.png)
(3)利用上述结论,计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dd60045dffab291246d697fb8d013c.png)
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6 . 如图所示,它是一个三角点阵,从上向下数有无数多行,其中第一行有1个点,第二行有2个点……,第
行有
个点,……
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/ea1836b4-6f58-4a95-9b19-582182ed17fe.png?resizew=172)
(1)第一行有1个点,前两行点数和是3,前三行点数和是6,请问前四行的点数和是 ,前
行的点数和是 ;
(2)探究发现,120是前 行的点数和;
(3)三角点阵中前
行的点数和能是600吗?如果能请求出;如果不能,试用一元二次方程说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/ea1836b4-6f58-4a95-9b19-582182ed17fe.png?resizew=172)
(1)第一行有1个点,前两行点数和是3,前三行点数和是6,请问前四行的点数和是 ,前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)探究发现,120是前 行的点数和;
(3)三角点阵中前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2023-12-25更新
|
61次组卷
|
2卷引用:山东省临沂市兰山区2023-2024学年九年级上学期期中数学试题
7 . 观察下面的点阵图和相应的等式,探究其中的规律:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/5bfc76d5-4508-478b-bbe3-12e87fb335fa.png?resizew=339)
(1)在④后面的横线上写出相应的等式;
①
;②
;③
;④ ;
(2)试用含有n的式子表示这一规律:
;(
为正整数)
(3)请计算:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/5bfc76d5-4508-478b-bbe3-12e87fb335fa.png?resizew=339)
(1)在④后面的横线上写出相应的等式;
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1db1c8f88c5de20586db0cde44d3e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194969148c9c1b7df23d1c65f16767da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c94bed97397edf43702cba40b6aec6.png)
(2)试用含有n的式子表示这一规律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92235f4fa95c2466b0c17d770aeb2167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d66e386ee6279aae2f650d0fa40e6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)请计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38d5f9540e4f39b041bc32f37a3add4.png)
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8 . 用火柴棒按如图的方式拼图形,①中有7根火柴棒,②中有12根火柴棒,③中有17根火柴棒……,则图形⑩中火柴棒的根数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/3b0e14ea-5637-4718-93fd-7e02206880de.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/3b0e14ea-5637-4718-93fd-7e02206880de.png?resizew=178)
A.42 | B.47 | C.52 | D.57 |
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9 . 观察图,解答下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/2affcf1d-efc5-422c-9621-14f24b0d9ba0.png?resizew=103)
(1)图中的小圆圈被折线隔开分成六层,第一层有1个小圆圈,第二层有3个圆圈,第三层有5个圆圈,…,第六层有11个圆圈.如果要你继续画下去,第n层有______个圆圈.
(2)某层上有67个圆圈,这是第______层.
(3)数图中的圆圈个数可以有多种不同的方法.
比如:前两层的圆圈个数和
或
,由此得,
.同样,
由前三层的圆圈个数和得:
.
由前四层的圆圈个数和得:
.
由前五层的圆圈个数和得:
.
请你猜测,从1开始的n个连续奇数之和是多少?用公式把它表示出来______.
(4)计算:
的和;
(5)计算:
的和.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/2affcf1d-efc5-422c-9621-14f24b0d9ba0.png?resizew=103)
(1)图中的小圆圈被折线隔开分成六层,第一层有1个小圆圈,第二层有3个圆圈,第三层有5个圆圈,…,第六层有11个圆圈.如果要你继续画下去,第n层有______个圆圈.
(2)某层上有67个圆圈,这是第______层.
(3)数图中的圆圈个数可以有多种不同的方法.
比如:前两层的圆圈个数和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f995a807f5b16a7dd7744b276fcc14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad4668cc927e277289b2af718f0d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194969148c9c1b7df23d1c65f16767da.png)
由前三层的圆圈个数和得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c94bed97397edf43702cba40b6aec6.png)
由前四层的圆圈个数和得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6dbfcc045a5631d9a2c080b18cc005a.png)
由前五层的圆圈个数和得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c904e397a2854240e74510bb477e18.png)
请你猜测,从1开始的n个连续奇数之和是多少?用公式把它表示出来______.
(4)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286f1c72c2fd118aae87c666f7769651.png)
(5)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef852e38f17f611460790d0f0f33aae.png)
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10 . 用边长为1的两种不同颜色的正方形纸片,按下图方式拼正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/f47dc789-276a-46c8-889f-abd440af43e6.png?resizew=276)
第(1)个图形用了1张正方形纸片;
第(2)个图形用了
张正方形纸片;
第(3)个图形用了
张正方形纸片;
第(4)个图形用了
张正方形纸片;……
(1)由此可得:
______(用含n的式子表示);
(2)完成下列问题:
①直接写出
的计算结果是______;
②计算
的结果.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/f47dc789-276a-46c8-889f-abd440af43e6.png?resizew=276)
第(1)个图形用了1张正方形纸片;
第(2)个图形用了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858d7a44b3c0b6884d89380960b46c95.png)
第(3)个图形用了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a8f1227b07e7e77a824d4115546ecc6.png)
第(4)个图形用了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0739731cf1b450a06a76f21ef2cf8b5.png)
(1)由此可得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93ae6aa77c004b82daba7d248eba82a.png)
(2)完成下列问题:
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1311a38bc913e08403d418e39b82534c.png)
②计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4d06dd8f405685dac055a68537e26e.png)
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