1 . 有一电脑程序:每按一次按键,屏幕的
区就会自动加上
,同时
区就会自动减去
,且均显示化简后的结果.已知
两区初始显示的分别是
和
,如图,第一次按键后,
两区分别显示:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/54c243d1-3018-4f7c-8878-46d595048b2b.png?resizew=261)
(1)从初始状态按2次后,分别求
两区显示的结果;
(2)从初始状态按4次后,计算
两区代数式的和,请判断这个和能为负数吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9878a063abcb6098d10560f2bf2d4b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06fc7811f9525e8b8c833746d6af5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec54f53122364c46e1e43d1a84f210fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/54c243d1-3018-4f7c-8878-46d595048b2b.png?resizew=261)
(1)从初始状态按2次后,分别求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(2)从初始状态按4次后,计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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2 . 如图是8个台阶的示意图,每个台阶的高和宽分别是1和2,每个台阶凸出的角的顶点记作
(
为
的整数).函数
的图象为曲线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/caf6e77f-62c0-4b9a-b59e-967504c9a71b.png?resizew=197)
(1)若
过点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
__________ .
(2)若
过点
,则它必定还过另一点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
__________ .
(3)若曲线
使得
这些点分布在它的两侧,每侧各4个点,则
的整数值有__________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e74be91bfe4bc209da7539dbf9b72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee9ff72d210845d3dfd48842e448d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cb90e72041e9139d4964f529ae1728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/caf6e77f-62c0-4b9a-b59e-967504c9a71b.png?resizew=197)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9a724b59c890095baa5cb73e267c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2114a0fe21dc0e5bf831c146ef02b113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e74be91bfe4bc209da7539dbf9b72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(3)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513bdca9473fc5263b449f58945ac5eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
3 . 如图是用三块正方形纸片以顶点相连的方式设计的“毕达哥拉斯”图案.现有五种正方形纸片,面积分别是1,2,3,4,5,选取其中三块(可重复选取)按图的方式组成图案,使所围成的三角形是面积最大的直角三角形,则选取的三块纸片的面积分别是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/a515a05f-77ef-44d5-b213-b6064c2ca662.png?resizew=130)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/a515a05f-77ef-44d5-b213-b6064c2ca662.png?resizew=130)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
4 . 在“□1□2□3□4□5□6□7□8□9”的小方格中填上“+”“-”号,如果可以使其代数和为n,就称数n是“可被表出的数”,否则,就称数n是“不可被表出的数”(如1是可被表出的数,这是因为
是1的一种可能被表出的方法).
(1)求证:7是可被表出的数,而8是不可被表出的数;
(2)求25可被表出的不同的方法种数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49df552f9b40ffb9aae0a804ce232982.png)
(1)求证:7是可被表出的数,而8是不可被表出的数;
(2)求25可被表出的不同的方法种数.
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5 . 如图1,在平面直角坐标系中,直线
与直线
相交于点
,点A是直线
上的动点,过点A作
于点
,点
的坐标为
,连接
.设点A的纵坐标为
的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://img.xkw.com/dksih/QBM/2023/12/14/3388901252603904/3389081626116096/STEM/db4cbdc765054195a84bec305037bfea.png?resizew=334)
(1)当
时,请直接写出点
的坐标;
(2)
关于
的函数解析式为
,其图象如图2所示,结合图1、2的信息,求出
与
的值;
(3)在
上是否存在点A,使得
是直角三角形?若存在,请求出此时点A的坐标和
的面积;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb51096f4d54ad3cc2aa72a26151904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9f9375b79d1c2591bef9c147a9c441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd2d246f0850db73fe2e6b1e26eb549.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/fb0e705301752424a492f6277ed7774e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3c8c0d7a9eebcf92e49659a58a0a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://img.xkw.com/dksih/QBM/2023/12/14/3388901252603904/3389081626116096/STEM/db4cbdc765054195a84bec305037bfea.png?resizew=334)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/486d75d269000f65978a4922abdd53f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
6 . 为了解疫情期间学生网络学习的学习效果,东坡中学随机抽取了部分学生进行调查.要求每位学生从“优秀”,“良好”,“一般”,“不合格”四个等次中,选择一项作为自我评价网络学习的效果.现将调查结果绘制成如图两幅不完整的统计图,请结合图中所给的信息解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/e428c93e-38bf-4812-bb15-d032e11a7158.png?resizew=356)
(1)这次活动共抽查了__________人.
(2)将条形统计图补充完整,并计算出扇形统计图中,学习效果“一般”的学生人数所在扇形的圆心角度数.
(3)张老师在班上随机抽取了4名学生,其中学习效果“优秀”的1人,“良好”的2人,“一般”的1人,若再从这4人中随机抽取2人,请用画树状图法,求出抽取的2人学习效果全是“良好”的概率.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/e428c93e-38bf-4812-bb15-d032e11a7158.png?resizew=356)
(1)这次活动共抽查了__________人.
(2)将条形统计图补充完整,并计算出扇形统计图中,学习效果“一般”的学生人数所在扇形的圆心角度数.
(3)张老师在班上随机抽取了4名学生,其中学习效果“优秀”的1人,“良好”的2人,“一般”的1人,若再从这4人中随机抽取2人,请用画树状图法,求出抽取的2人学习效果全是“良好”的概率.
您最近一年使用:0次
7 . 已知:如图,一次函数的图象与反比例函数的图象交于
两点,与
轴正半轴交于点
,与
轴负半轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/69df1a9f-7667-4af0-a9bf-563fe150edb7.png?resizew=176)
(1)求反比例函数的解析式;
(2)当
时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c25b1fd10831f3aed13a862aa93e24.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/69df1a9f-7667-4af0-a9bf-563fe150edb7.png?resizew=176)
(1)求反比例函数的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc27da9d3158ea1caeaac45618a09b2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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8 . 实践操作:
第一步:如图1,将矩形纸片
沿过点
的直线折叠,使点
落在
上的点
处,得到折痕
,然后把纸片展平.
第二步:如图2,将图1中的矩形纸片
沿过点
的直线折叠,点
恰好落在
上的点
处,点
落在点
处,得到折痕
交
于点
交
于点
,再把纸片展平.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/3274c214-8391-4e0d-acc1-1db0495f3bed.png?resizew=293)
问题解决:
(1)如图1,填空:四边形
的形状是__________.
(2)如图2,线段
与
是否相等?若相等,请给出证明;若不等,请说明理由;
(3)如图2,若
,求
的值.
第一步:如图1,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
第二步:如图2,将图1中的矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765ea5b7cfea102af1be802787ed42eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3275edb14633cbd5fae25fcc0276628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/3274c214-8391-4e0d-acc1-1db0495f3bed.png?resizew=293)
问题解决:
(1)如图1,填空:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0054610b07c11f3cb88aa87b58c2df11.png)
(2)如图2,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199336204fbca97766bf24b1dc5fdc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33bd96f676101869a9f1bc692066c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd13e6bd1e3d7815d82b6fe073123af5.png)
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9 . 如图,点
为
中点,分别延长
到点
到点
,使
.以点
为圆心,分别以
为半径在
上方作两个半圆.点
为小半圆上任一点(不与点
重合),连接
并延长交大半圆于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/1ddf5ce2-4468-4d8c-b5ec-b71201674b43.png?resizew=390)
(1)①求证:
;
②写出
和
三者间的数量关系,并说明理由.
(2)若
,当
最大时,直接指出
与小半圆的位置关系,并求此时
(答案保留
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa48616f1944739471d03422859b8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f0cb663c82fc5de837fa273f983ce8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/1ddf5ce2-4468-4d8c-b5ec-b71201674b43.png?resizew=390)
(1)①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb0368d6e9824a085e5b41c2da993d7.png)
②写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497b955fd8c7d39a388ed329624d9bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6aed6102edbc4138df13cba9c264b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637f7d8b87adc59c9b06b09803a06553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
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10 . 用承重指数
衡量水平放置的长方体木板的最大承重量.实验室有一些同材质同长同宽而厚度不一的木板,实验发现:木板承重指数
与木板厚度
(厘米)的平方成正比,当
时,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/bb308bd5-f038-4a2e-a582-60444187cc90.png?resizew=208)
(1)求
与
的函数关系式.
(2)如图,选一块厚度为6厘米的木板,把它分割成与原来同长同宽但薄厚不同的两块板(不计分割损耗).设薄板的厚度为
(厘米),
.
①求
与
的函数关系式;
②x为何值时,Q是
的3倍?[注:(1)及(2)中的①不必写x的取值范围].
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdde9539c359cd6f4793fd8190cecd44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/bb308bd5-f038-4a2e-a582-60444187cc90.png?resizew=208)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)如图,选一块厚度为6厘米的木板,把它分割成与原来同长同宽但薄厚不同的两块板(不计分割损耗).设薄板的厚度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54d39f07fccf84bab725f45497e29a01.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②x为何值时,Q是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26398218820ab57e8c6b414c6ff1db6.png)
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