1 . 已知
是关于x的方程
的解.
(1)求
;
(2)求
的值;
(3)解关于x的方程
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbe3b40fab070b017550869149f7c821.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86f0660bb7c17dfa0937e0777c6f804.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de74fc443230f77d85079758b039ee96.png)
(3)解关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1776d6947860f97451c167bc4bde3b.png)
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2 . 对于数轴上三个不同的点A,B,C,给出如下定义:在线段
中,若其中有两条线段相等,则称A,B,C三点是“均衡点”.
(1)点A表示的数是
,点B表示的数是1,点C表示的数是3,
①A,B,C三点______(填“是”或“不是”)“均衡点”;
②点M表示的数是m,且B,C,M三点是“均衡点”,则
________;
(2)点D表示的数是x,点E表示的数是n,线段
(a为正整数),线段
,若D,E,F三点是“均衡点”,且关于x的一元一次方程
的解为整数,求n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a6936a0a7379a7dd2331182696712a.png)
(1)点A表示的数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
①A,B,C三点______(填“是”或“不是”)“均衡点”;
②点M表示的数是m,且B,C,M三点是“均衡点”,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)点D表示的数是x,点E表示的数是n,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3319509bbd6b74f077bc88681d7be74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee745c99acb9d50c86ebd83faf2d020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea78f5c24a448c20eb7ed2a2bde224fa.png)
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3 . 小文同学晚上写数学作业,在解方程“
”时,将“
”中的负号抄漏了,解出
,则方程正确的解为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8053710f85cd2d681dfb7ed4d61ecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78db83a3fbad2a4732e9ecc196521d46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知
的绝对值是2,
与
互为倒数,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473cde34d30af32e391194ae7cf58754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26a7fa0f27339e750dd7e7c3b8b37759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
A.![]() | B.2 | C.![]() ![]() | D.2或![]() |
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5 . 我国著名数学家华罗庚先生说过:“数形结合百般好,隔裂分家万事休”,数形结合的思想方法在数学中应用极为广泛.
【规律探索】用同样大小的两种正方形纸片,按下图方式拼正方形.
【规律归纳】
(1)图3中共有
个小正方形,图4共有
________
个小正方形;
(2)按图示方式继续拼下去,图
中(未画出)共有
________=________个小正方形;
【规律应用】
(3)请用上述规律计算:
.
【规律探索】用同样大小的两种正方形纸片,按下图方式拼正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/d72789fe-1d5a-45a1-9162-f29cdb1b206c.png?resizew=266)
【规律归纳】
(1)图3中共有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a8f1227b07e7e77a824d4115546ecc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2024bd59ecfd6289aedb725f3d7a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d152d306a32968fff7e2f354a7ff5e69.png)
(2)按图示方式继续拼下去,图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d6164f87e6584f3be909db03d6f65a.png)
【规律应用】
(3)请用上述规律计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16d26cb336c32cc0998b398a4dac935.png)
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6 . 下列说法正确的是( )
A.![]() | B.![]() |
C.如果![]() ![]() | D.由![]() ![]() |
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7 . 解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5fe6ec6ed4ccdab099430d541d810d0.png)
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8 . 解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c886c38b981122bfdea9eaffa20e79.png)
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9 . 记
为
,
为
.我们知道,当这两个代数式中的
取某一确定的有理数时,
和
的值也随之确定,例如当
时,
.若
和
,
的值如下表所示.
则
和
的值分别是:
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ ;
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cd71ad57b7bd04c3fa74bd963a8c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a2dc66a7e7c74307e9a37f3b76154e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928ead1a7ba4666e4014dad7784116ab.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)
![]() | 2 | ![]() |
![]() | 3 | ![]() |
![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
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名校
10 . 定义一种新运算“&”:当
时,
;当
时,
;当
时,
.例如:
.
(1)直接写出
;
(2)已知
,求
的值;
(3)若关于
的方程
的解为
,则
的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b21208364124b5c477b2ff8df1c2e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc54f1d6c8c318553abef20406d8e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dcf4603d9ffb0e815e988c74a7010e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a5abe56c019ac914e1fcde1865a747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9160c033a2b47b133547c2e12ef1ef03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a4541dd837b01e10a188a67f324371.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f818d1f61fdf373befceb0899e6b1c46.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6250a7e2e0c64d92782bbe7b1b977b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dbefd07a16acafaf7acd8df6c5acae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521e8a2fa5514c407d97b8c292cc406a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2024-01-19更新
|
269次组卷
|
2卷引用:北京市海淀区2023~2024学年七年级上学期期末数学试题