定义:若关于
的方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ddf68448b62a8da683ac4da36e6279.png)
的解与关于
的方程
的解满足
(
为正数),则称方程
与方程
是“
差解方程”.
(1)请通过计算判断关于
的方程
与关于
的方程
是不是“2差解方程”;
(2)若关于
的方程
与关于
的方程
是“
差解方程”,求
的值;
(3)关于x,y的两个方程
与方程
,若对于任何数
,都使得它们不是“2差解方程”,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ddf68448b62a8da683ac4da36e6279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2b5ee1eabb64358a3d9db2349b6fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e2e91e3fae0e209e1138c13baa7956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f8f097b7c2091003d0ee5045dd0342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb0125bbedc5e1e589258e14a9a2a89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e2e91e3fae0e209e1138c13baa7956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)请通过计算判断关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0e37a9fe40a72528d15de4c605a66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb67587add6e8653ea3559d4d9f875ff.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea8a0675b7164772048646d39c41c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b684240d0867d7144686662bc1bde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)关于x,y的两个方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474a4f53866be745f8d343c33d62aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea0465ea121fd21fb6fe2ed76f8e72a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
23-24七年级上·湖南长沙·期中 查看更多[4]
湖南省长沙市湖南师范大学附属中学2023-2024学年七年级上学期期中数学试题(已下线)清单08 解一元一次方程(1个考点梳理+12种题型解读+提升训练)-2023-2024学年七年级数学上学期期末考点大串讲(苏科版)福建省泉州市永春县福建省永春第一中学2023-2024学年九年级上学期1月月考数学试题(已下线)基础卷-2023-2024学年七年级数学上学期期末模拟卷(福建专版)-【题型分类精粹】2023-2024学年七年级上学期数学期中期末复习讲练系列【考点闯关】(人教版)
更新时间:2023-11-25 14:21:03
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【推荐1】下面材料:
已知点
在数轴上分别表示有理数
,
两点之间的距离表示为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
当
两点中有一点在原点时,不妨设点
为原点,如图1,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdb7860ac5286a7a8b8d435c1ecc1bb.png)
当
两点都不在原点时,
(1)如图2,点
都在原点的右边,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de837eb8d6211ce9430a60f1af6b886a.png)
(2)如图3,点
都在原点的左边,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac90f63fdad89c52999e6239bd4dd17f.png)
(3)如图4,点
都在原点的两边,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04af8c7d53405876a237a2f2488b06fd.png)
综上,数轴上
两点的距离![](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 ;
(2)数轴上表示
和-1的两点
之间的距离是
,如果
,那么
;
(3)拓展:若点
表示的数为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①则当
为 时,
与
的值相等.
②当
时,整数
有 个
③
的最小值是
④
的最小值是
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdb7860ac5286a7a8b8d435c1ecc1bb.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
(1)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de837eb8d6211ce9430a60f1af6b886a.png)
(2)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac90f63fdad89c52999e6239bd4dd17f.png)
(3)如图4,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04af8c7d53405876a237a2f2488b06fd.png)
综上,数轴上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.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 ;
(2)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b90f5a50cabc6cad1b36bf25fc6d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236f52e04ddbd7253f44b97c4756ef9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(3)拓展:若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①则当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef9f220ca16010237cecd21cae59779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3cdffae7eae7d724d57319774cb4723.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335a4ff311ee4f97ac9280b4fd9859d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8555d0c3e962d9f3159c46de6f511129.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da00f1179e4d8ed009f5f8f95df0a3e.png)
![](https://img.xkw.com/dksih/QBM/2020/4/4/2434256806838272/2434902354714624/STEM/09c6762b2e754a88bf924f6be291d5fb.png?resizew=510)
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【推荐2】唐代著名文学家韩愈曾赋诗:“天街小雨润如酥,草色遥看近却无.”当代印度著名诗人泰戈尔在《世界上最遥远的距离》中写道:“世界上最遥远的距离,不是瞬间便无处寻觅;而是尚未相遇,便注定无法相聚.”距离是数学、天文学、物理学中的热门话题,唯有对宇宙距离进行测量,人类才能掌握世界尺度.已知P、Q在数轴上分别表示有理数p、q,P、Q两点的距离表示为
.
阅读上述材料,回答下列问题:
(1)若数轴上表示x与3的两点之间的距离是4,则
___________.
(2)当x的取值范围是多少时,代数式
有最小值,最小值是多少?
(3)若未知数x,y满足
,求代数式
的最大值,最小值分别是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d394f3eaf0cbab7fd5799d3da5755b4.png)
阅读上述材料,回答下列问题:
(1)若数轴上表示x与3的两点之间的距离是4,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(2)当x的取值范围是多少时,代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da0928d0c928f5ecc544c96aa543aed.png)
(3)若未知数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2308fa10e198eb22827a86fef05f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fc838e1477179b36ca7481ee2cc1e8.png)
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【推荐1】若一个四位数m的千位数字与百位数字和的两倍等于其十位数字与个位数字的和.则称这个四位数m为“扬帆数”.将“扬帆数”m的千位数字与十位数字对调,百位数字与个位数字对调得到新数
,并记
.例如:
.
∵
,∴1335是“扬帆数”,此时
;
又如:
,∵
,∴2345不是“扬帆数”.
(1)判断1437,3578是否是“扬帆数”,说明理由;如果是,求出对应的
的值;
(2)若四位数
(
,
为整数),且
能被8整除,求出所有满足条件的“扬帆数”m.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7093538ecfb10a639b23863e7331a66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20bf5585721038c304b131d876944e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b657816273137e51f7ebc92f1e18a13.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062ff9c94638eba9a477ed5becc371a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bdac8cea52c840c760d05bb25dd2cbd.png)
又如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a37e96289b32fe549f65e3934dc98cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ba125a301265051a41e52096d25bb1.png)
(1)判断1437,3578是否是“扬帆数”,说明理由;如果是,求出对应的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bb215f28e5eea7ff4c7ca5ee9e2216.png)
(2)若四位数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7772099d92a2ece88d8e4b28f3b74223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c087d6743fa540d343c8fe38d41a119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d10449bc77d692a7270e0f20a68cdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bb215f28e5eea7ff4c7ca5ee9e2216.png)
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【推荐2】定义:如果一个分式能化成一个整式与一个分子为常数的分式的和的形式,则称这个分式为“和谐分式”.如:
,
,则
和
都是“和谐分式”.
(1)下列分式中,不属于“和谐分式”的是 (填序号).
①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29eee1a9428a80539cc4650f4da31c17.png)
(2)将“和谐分式”
化成一个整式与一个分子为常数的分式的和的形式.
(3)应用:先化简
,并求
取什么整数时,该式的值为整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078897ab1742d6aff7bca6c0122b06df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a845a36976cd35465170e8e5573c467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2bcc842de174051e964c3d4de3e883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aba08120999790b1c8a429db226292d.png)
(1)下列分式中,不属于“和谐分式”的是 (填序号).
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ee3c9f1766ebb9378bf10856996dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d35b869b336551aab572c2a7c9464f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4463511363399e0a8841e52ce1e7d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29eee1a9428a80539cc4650f4da31c17.png)
(2)将“和谐分式”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa085a52d14a85d9e647ca01a5b3312.png)
(3)应用:先化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9696f21c6a2f4eaa54a747811b5ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】求关于x的方程2x﹣5+a=bx+1,
(1)有唯一解的条件;
(2)有无数解的条件;
(3)无解的条件.
(1)有唯一解的条件;
(2)有无数解的条件;
(3)无解的条件.
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【推荐2】解下列关于x的方程:
(1)ax+x=2(x-2)(
)
(2))b
=
+1(b>1)
(1)ax+x=2(x-2)(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
(2))b
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
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【推荐1】已知关于
的方程组
分别求出当a为何值时,方程组的解为:
(1)唯一一组解;
(2)无解;
(3)有无穷多组解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd66905cde02fea52301f435113cc97e.png)
(1)唯一一组解;
(2)无解;
(3)有无穷多组解.
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【推荐2】已知
都是质数,且使得关于x的方程
至少有一个正整数根,求所有的质数对
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b06d153c19f4cb269da82c39b80627f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e257b2b02bcd57c116841807979bbc.png)
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