1 . 解方程:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e2be1343c6d96eed24b7e142133503.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ba5200f7a88ef7a20a77ab638e5c8d.png)
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2 . 解方程:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ce530b6aa110f7f9a331b39f3e29df.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bca242a01c653cfd7aabe07aa71c134.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db9af90a41de8afb494094fdf4e2edf.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ba5200f7a88ef7a20a77ab638e5c8d.png)
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3 . 若
是关于x的方程
的解,那么k的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0164fc4e887b5ff812bff2a62f11fa67.png)
A.1 | B.3 | C.4 | D.2 |
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4 . 当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
_____ 时,代数式
与
的值是互为相反数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ac7fa45d1a150d095f7ae45aab0696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f8f3c71c700d6195893b31db2d47f6.png)
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5 . 若定义“*”运算“
”若:
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4add8078009c2578c9fe9a7f465cb178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01439b50497d4b937ed5471c4aa0b5fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 阅读下列材料,解答下面的问题.
我们知道每一个二元一次方程都有无数组解,例如
,
,
……都是方程
的解,但在实际生活中我们往往只需求出其正整数解即可.
我们在求一个二元一次方程的正整数解时通常采用如下方法:
例:求
这个二元一次方程的正整数解.
解:
,得:
,
根据x、y为正整数,运用尝试法可以知道
方程
的正整数解为
或
.
问题:
(1)若
为非负整数,则满足条件的整数x的值有______个.
(2)直接写出满足方程
的正整数解______.
(3)若要把一根长为
的绳子截成长为
和
两种规格的绳子若干段(两种规格都有),请你在不浪费材料的情况下,通过计算来设计几种不同的截法.
我们知道每一个二元一次方程都有无数组解,例如
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ddf5c595c0eff128a9c5026642fb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876083aaa2ed361b9427965938f67a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ade44ed00e4947cce113625962f32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200904bec6711851fd27431f7c533197.png)
我们在求一个二元一次方程的正整数解时通常采用如下方法:
例:求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cca1e3bc5f70299bfd1d6b9b53bce9.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cca1e3bc5f70299bfd1d6b9b53bce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7a1368124af32d4fd9b07d659a9089.png)
根据x、y为正整数,运用尝试法可以知道
方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cca1e3bc5f70299bfd1d6b9b53bce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a7a8b0f00bd6383e0fbca90889344b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43182eee704131b093e4d5417e1da884.png)
问题:
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa03753cd01c903dd2f0d6bb86dbcf1.png)
(2)直接写出满足方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee74c4aee081cd523ad1653ff22a47f2.png)
(3)若要把一根长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c857aaa8fc6074c0d499298451e4e737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36b51b654efcff60d2d640b9b4c4471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7854968bbf6576a1fd9926ee0d4d63.png)
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2024-03-04更新
|
374次组卷
|
4卷引用:考题猜想4-2 二元一次方程组 (11种计算题)-2023-2024学年七年级数学下学期期末考点大串讲(苏科版)
(已下线)考题猜想4-2 二元一次方程组 (11种计算题)-2023-2024学年七年级数学下学期期末考点大串讲(苏科版)吉林省长春市二道区2022-2023学年七年级下学期期末数学试题(已下线)专题8.2 二元一次方程组的相关概念(分层练习)-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)(已下线)专题10.2 二元一次方程组(分层练习)-2023-2024学年七年级数学下册基础知识专项突破讲与练(苏科版)
7 . 现有一列数:
,
,
,
,…,
,
(n为正整数),规定
,
,
,…,
,若
,则x的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7230de53663c75658c58bbf206a0085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df7f2beffd703583d4b4db720bf778b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea11bd18577ee314988bc70b0caf23f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667bf06ddd83d9da7f2d0e01cc3319b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d6e8a35c5a4f76bb3791261681d318.png)
A.1 | B.1.5 | C.2 | D.2.5 |
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8 . 解下列方程:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fec8097ceaac1a3887186585709356.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fec8097ceaac1a3887186585709356.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b346e6967b09029eb76fdb2414a808f3.png)
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9 . 解方程:
(1)
;
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c4afb5c8dde3d2b8377addeea68826.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271494726d27b3f9b4b8ba379553fb88.png)
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10 . 已知关于
的方程
和
有相同的解,求
与方程的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5c1ecc6737135e11fb50d9adc7edce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac9abad681136ad47c06b25beb61026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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