1 . 定义:若两个有理数的和等于这两个有理数的积,则称这两个数互为“奇妙数”.如:有理数
与5,因为
,所以
与5互为“奇妙数”.
(1)判断
与
是否互为“奇妙数”,并说明理由;
(2)若有理数
与
互为“奇妙数”,
与
互为相反数,求代数式
的值;
(3)对于有理数
且
,设
的“奇妙数”为
;
的倒数
;
的“奇妙数”为
;
的倒数为
;……;依次按如上的操作,得到一组数
.当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2a35786ba3d6f8034d83857a218fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(2)若有理数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abddd527bf911eb69bb17a77b2b9a7ea.png)
(3)对于有理数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea675d7b6c3299771619fabfca45789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a0e656a2de8d47b9001cc32b1316eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7aca45b49317c3736acf6c8850ae44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d599059e6b2c918ab15ee22611b6962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd4ed30a6e346b92f00d238f16679f7.png)
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2 . (1)解方程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9626aed4d43a4e06238656b64ca3afbb.png)
(2)下面是小林同学解一元一次方程的过程,请认真阅读并解答相应问题.
解方程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02fb29f05576b6b6ef185dc6377c748.png)
解:去分母,得
.…第一步
去括号,得
.…第二步
移项,得
.…第三步
合并同类项,得
.…第四步
系数化为1,得
.…第五步
填空:
①以上求解步骤中,第______步开始出现错误,错误的原因是______;
②该方程的正确解为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9626aed4d43a4e06238656b64ca3afbb.png)
(2)下面是小林同学解一元一次方程的过程,请认真阅读并解答相应问题.
解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02fb29f05576b6b6ef185dc6377c748.png)
解:去分母,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f72ade6e439f05d0bca3b2b5252e88.png)
去括号,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561b9ebab7f0a411427fae3a00d9f037.png)
移项,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4f8b59d39262cb0e03c2b6c88de674.png)
合并同类项,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51be70ca4bc477c0b58f4eb495046047.png)
系数化为1,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b760c9b4e7c20265324b498b26cf43.png)
填空:
①以上求解步骤中,第______步开始出现错误,错误的原因是______;
②该方程的正确解为______.
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3 . 若关于
的方程
的解为
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008920013aa092a7c4f14ecf398bdb7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.2 | B.![]() | C.10 | D.![]() |
您最近一年使用:0次
4 . 某校图书馆中1张桌子安排6个座位,按照如图所示的方式将桌子拼在一起,若要安排22个座位,则需要桌子的张数是( )
A.9 | B.8 | C.7 | D.10 |
您最近一年使用:0次
2024-02-20更新
|
83次组卷
|
3卷引用:河南省商丘市虞城县2023-2024学年七年级上学期期末数学试题
5 . 已知
是方程
的解,则a的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b960250345cdb27acd1470295fed.png)
A.3 | B.4 | C.5 | D.6 |
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6 . 某学校图书馆中1张桌子安排8个座位,按照右图方式将桌子拼在一起,安排了22个座位,需要桌子的张数是________ .
![](https://img.xkw.com/dksih/QBM/2024/1/25/3418668434931712/3433739198627840/STEM/25277e34a21e48c8a039758fb9c08b74.png?resizew=335)
您最近一年使用:0次
7 . 已知
是方程
的解,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb1329c23cb2721b770e8b1f100a55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.2 | B.3 | C.4 | D.![]() |
您最近一年使用:0次
8 . 阅读材料:
学习了一元一次方程的解法后,老师布置了这样一道题,解方程:
.
小晴同学的解答过程如下:
解方程:
.
解:
……第①步
……第②步
……第③步
……第④步
……第⑤步
(1)解答过程中第①步的依据是___________;
(2)以上解答过程中,第__________步开始出现错误;
(3)写出解该方程的正确过程.
学习了一元一次方程的解法后,老师布置了这样一道题,解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24632078179730ae150a74035ad6a5b.png)
小晴同学的解答过程如下:
解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24632078179730ae150a74035ad6a5b.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ea350c47d6729427be418a36e8a7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57a8883e424ba95d8dc656038844073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b05dd6ef12a83181b1827daaf457a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cdce84cdb6b87e6ceb887bb7d208f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(1)解答过程中第①步的依据是___________;
(2)以上解答过程中,第__________步开始出现错误;
(3)写出解该方程的正确过程.
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9 . 解方程:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1d07e9c39a9e36212c5e43b696bccb.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/511477eab26a3d4a087e6944e5bedb92.png)
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10 . 如果方程
和方程
的解相同,那么a的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bbc78734719ab7ea1add48ede1f128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6ab3768f3ff96c9ae896a40eae94f5.png)
A.1 | B.5 | C.0 | D.−5 |
您最近一年使用:0次
2024-02-18更新
|
33次组卷
|
3卷引用:河南省南阳市新野县2023-2024学年七年级下学期期中数学试题