1 . 观察下列每对数在数轴上的对应点间的距离4与
,3与5.并回答下列各题:
(1)你能发现:3与5在数轴上的对应点间的距离可以表示为:
;4与
在数轴上的对应点间的距离可以表示为:
;根据以上规律,则
与
在数轴上的对应点的距离是 .
(2)若数轴上的点A表示的数是x,点B表示的数是
,则A 与B两点间的距离可以表示为 .
(3)结合数轴,求得
的最小值为 ;
(4)满足
,则x的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/243f5575-30b8-4d0e-9c3d-f184cb8d83b0.png?resizew=356)
(1)你能发现:3与5在数轴上的对应点间的距离可以表示为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd529494cfd2a4700e84c13b25db0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b357b9e63a3627aca880cd0a40b3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
(2)若数轴上的点A表示的数是x,点B表示的数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(3)结合数轴,求得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13cf6f34ceecab7d47400dd3d0e247c.png)
(4)满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ce110b52b8ee0f943a481e7619830b.png)
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2023-09-24更新
|
73次组卷
|
3卷引用:河南省洛阳市2023-2024学年七年级上学期期中数学试题
2 . 定义:对于任意两个不相等的有理数a,b,计算:
,
,所得结果的最小值称为a,b的“关联差”.例如:
,2.因为
,
,所以
,2的“关联差”为
.
(1)3,
的“关联差”为______;
(2)
,8的“关联差”与8,
的“关联差”有何关系,请说明理由;
(3)当2,
的“关联差”为
时,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408797c93778702f193d9062fb928538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da2a94228bc58445e2f9aee4c0627573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10cc0d574b82b084d7c39c28b295627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92d7bb7fc7d89d3598d7ed85f4146b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
(1)3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
(3)当2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbd7bf765eb3b6952cf97be50992c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
您最近一年使用:0次
名校
3 . 绝对值拓展材料:
表示数a在数轴上的对应点与原点的距离.一般地,点A、B在数轴上分别表示有理数a、b,那么A、B之间的距离可表示为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/30ac9969-f2d7-45da-9aa3-14d734af5588.png?resizew=461)
(1)A、B分别为数轴上两点,A点对应的数为
,B点对应的数为4.
①A、B两点之间的距离为___________;
②若在数轴上存在一点P到A的距离是点P到B距离的2倍,则点P所表示的数是___________;
(2)
的最小值为___________,若满足
时,则x的值是___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/30ac9969-f2d7-45da-9aa3-14d734af5588.png?resizew=461)
(1)A、B分别为数轴上两点,A点对应的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74eb8a7738402df52d4a97262b85ca0.png)
①A、B两点之间的距离为___________;
②若在数轴上存在一点P到A的距离是点P到B距离的2倍,则点P所表示的数是___________;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c21555c174394e8251960b6b9715961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb465ad46114ac7bbd67d241d585aee.png)
您最近一年使用:0次
2022-11-17更新
|
117次组卷
|
3卷引用:猜题04 一元一次方程(拔高必刷55题12种题型专项训练)-2023-2024学年七年级数学上学期期末考点大串讲(苏科版)
(已下线)猜题04 一元一次方程(拔高必刷55题12种题型专项训练)-2023-2024学年七年级数学上学期期末考点大串讲(苏科版)浙江省宁波市北仑区宁波东海实验学校2022-2023学年七年级上学期期中数学试题浙江省宁波市北仑区宁波东海实验学校2022-2023学年八年级上学期期中数学试题
4 . 定义:对于任意两个不相等的有理数m,n,计算:
,
,所得结果的最小值称为m,n的“友谊差”.例如:﹣1,2.因为
,
,所以﹣1,2的“友谊差”为﹣4.
(1)2,﹣3的“友谊差”为______;
(2)﹣5,7的“友谊差”与7,﹣5的“友谊差”有何关系,请说明理由;
(3)当1,x(x≠1)的“友谊差”为﹣3时,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2a12c8575d1fffcf3d1c538ac37193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd431a3d830414293805f0f2d702e236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db50df11b82b7f7f54e3f86570ef927a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53d4318d64d6b083ba5d664ecf62739.png)
(1)2,﹣3的“友谊差”为______;
(2)﹣5,7的“友谊差”与7,﹣5的“友谊差”有何关系,请说明理由;
(3)当1,x(x≠1)的“友谊差”为﹣3时,求x的值.
您最近一年使用:0次
5 . 超越梦想:阅读下面材料:点A、
在数轴上分别表示有理数
、
,A、
两点之间的距离表示为
.当A、
两点中有一点在原点时,不妨设点A在原点,如图1,
,当A、
两点都不在原点时,
点A、
在原点的右边,如图2,
;
点A、
在原点的左边,如图3,
;
点A、
在原点的两边,如图4,
.
综上,数轴上A、
两点的距离
.
回答下列问题:
(1)数轴上表示2和5的两点之间的距离是______,数轴上表示
和
的两点之间的距离是______,数轴上表示1和
的两点之间的距离是______.
(2)数轴上表示
和
的两点A和
之间的距离是______,如果
那么
为______.
(3)当代数式
取最小值时,相应
的取值范围是______,最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdb7860ac5286a7a8b8d435c1ecc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/0e9564c8-7f5c-476f-aa7b-49042dfda671.png?resizew=802)
点A、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de837eb8d6211ce9430a60f1af6b886a.png)
点A、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283b97d83aaceeca8b8fc692585c2be5.png)
点A、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19b41553d0177b7a60453dc7d7d2d12.png)
综上,数轴上A、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b60a6e9515c220c8554719e399ec47.png)
回答下列问题:
(1)数轴上表示2和5的两点之间的距离是______,数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(2)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a64bcb77f5f64e4af6930c249a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cfb936d8d761ccbe51b7892bd898a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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6 . 阅读下列两则材料:
材料1
君君同学在研究数学问题时遇到一个定义:对于按固定顺序排列的
个数:
,
,
,…,
,称为数列
:
,
,
,…,
,其中
为整数且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/835c74bbb8c61dd2d2f008664a8c8810.png)
定义:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8101a24185e64c0432f2c0484c08c14c.png)
例如数列
:1,2,3,4,5,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ee18511d8c0a5a36c8bf31b127c65b.png)
材料2
有理数
,
在数轴上对应的两点
,
之间的距离是
;反之,
表示有理数
,
在数轴上对应点
,
之间的距离,我们称之为绝对值的几何意义.君君同学求
的最小值时,利用绝对值的几何意义表示在数轴上
对应点到1和
对应点的距离之和,当
时,取到它的最小值3,即为1和
对应点之间的距离.
根据以上材料,回答下列问题:
(1)已知数列
:2,3,5,求
;
(2)已知数列
:
,
,
,
,其中
,
,
,
为4个互不相等的整数,且
,
,
,直接写出数列
:______;
(3)已知数列
:2,
,2,
,若
,求
的值;
(4)已知数列
:
,
,
,
,
,5个数均为非负整数,且
,则
的最小值是______.
材料1
君君同学在研究数学问题时遇到一个定义:对于按固定顺序排列的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596afe6f8149e39c53d36a759bee6151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7f2c72ab559a0615db4c51327b78d4.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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596afe6f8149e39c53d36a759bee6151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/835c74bbb8c61dd2d2f008664a8c8810.png)
定义:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8101a24185e64c0432f2c0484c08c14c.png)
例如数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5002f030017f6f0b34a61b2e15c5a9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ee18511d8c0a5a36c8bf31b127c65b.png)
材料2
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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144e844aaee2fa48017b118ac394ad17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9494f8aac293df6806b117ed2b6d2c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
根据以上材料,回答下列问题:
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4b7b2d96ee291bd133adadf80e4102.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754a5a4102094d0fc8a8c16c4fcd9bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19e797173385adb7619ce30c11f38b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05185093a5c9c19fcaa591bb58ca8a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
(3)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83666674f1111c699d7c5f7b792e0285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05185093a5c9c19fcaa591bb58ca8a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(4)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5002f030017f6f0b34a61b2e15c5a9cb.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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e065a81c4f4bef77423e5c97ef402a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c67fa69e6cd182bd3e1e887eba6897.png)
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7 . 阅读理解:
在形如
这一类含有绝对值的方程时,为了去绝对值符号,我们发现两个绝对值符号里面是相同的“
”,可以根据绝对值的意义先对“x”的取值分成
和
两种情况,再去绝对值符号:
①当
时,原方程可化为
,得
,不符合
,舍去;
②当
时,原方程可化为
,得
,符合
.
综合可得原方程的为
.
(1)方法应用:解方程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff322679c14fc546867b97a014352bf.png)
(2)拓展应用:方程:
;(提示;可以考虑先对“x”的取值进行分类,去了一个绝对值符号后;再对“x”的取值进行分类,去掉另一个绝对值符号)
(3)迁移应用:求
的最小值.
在形如
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b828ae57a25f3f3aaedb6c844f706c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e26ea0261f2b67983b07b8d0bb8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b83a660527359758db64e6566466293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4a7af57545523159f8c77e10f6f915.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b83a660527359758db64e6566466293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e381bcb0156d054d2eb9f9d8cfd14fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b83a660527359758db64e6566466293.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4a7af57545523159f8c77e10f6f915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d62b6575cf27f52103abd8b8a6a851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4a7af57545523159f8c77e10f6f915.png)
综合可得原方程的为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
(1)方法应用:解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff322679c14fc546867b97a014352bf.png)
(2)拓展应用:方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e909b70d1cd09ce14286ab4b02aba9.png)
(3)迁移应用:求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafe9766cc7f77f3a6167c278c59efdd.png)
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8 . 要使4x-
的值不大于3x+5,则x的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
A.4 | B.6.5 |
C.7 | D.不存在 |
您最近一年使用:0次
2018-03-07更新
|
575次组卷
|
3卷引用:人教版七年级下册数学练习:9.2实际问题与一元一次不等式(第1课时)
名校
9 . 数学巨人欧拉最先把关于x的多项式用记号
来表示,例如
,并把x等于某数时多项式的值用f(某数)来表示,例如
时多项式
的值记为
.
(1)若
,①求
的值;②若
,求x的值
(2)若
,
,试探究
的最小值,并指出此时x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58cbded0c91457fdf2ef7fd1e7db1ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acefdacd5c80d7bd7a515422b3ee6ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3158b3c43f8af02f6006f32aa68dcd1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5998bc3d6c9721bf695323668d63a9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32822a106d217ffdec43557a236f786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73c69e17414e1ee37762b7b78ca0418.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2b7eaf303dcd66e8901788a75145bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e174bed2bf0064fa9b5206605717456d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839f0adde40b6450f59c39e62ae16e88.png)
您最近一年使用:0次
名校
10 . 数学巨人欧拉最先把关于
的多项式用记号
来表示,例如
,并把
等于某数时多项式的值用
(某数)来表示,例如
时多项式
的值记为:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3158b3c43f8af02f6006f32aa68dcd1.png)
(1)若
,
①求
的值;
②若
,求
的值
(2)有时在同一道题中,为了区分不同的多项式,我们也可以用
,
这样的形式表示关于
的不同的多项式.若
,
,试探究
的最小值,并指出此时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58cbded0c91457fdf2ef7fd1e7db1ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acefdacd5c80d7bd7a515422b3ee6ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3158b3c43f8af02f6006f32aa68dcd1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f177e151e55b24cf49be667d4c72ae.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32822a106d217ffdec43557a236f786.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73c69e17414e1ee37762b7b78ca0418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)有时在同一道题中,为了区分不同的多项式,我们也可以用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf658da376b0f60bfb632739f63e9de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da5b0fa8793671135af39a641fc894b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839f0adde40b6450f59c39e62ae16e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2023-01-20更新
|
203次组卷
|
2卷引用:重庆市大渡口区第九十五初级中学校2022-2023学年七年级上学期期末数学试题