我们知道,
表示数轴上数
所对应的点与原点的距离,
表示数轴上数
对应的点与数
对应的点之间的距离.请据此解决以下问题:
(1)若方程
有解,求
的取值范围;
(2)求
的最小值;
(3)若不等式
有且只有100个整数解,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc51e97939a8966daa015535a801561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a25d8f9593923203536dc9264f7060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a18f269e37ff500828d0ade4ea2ae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec70b8434c7807282cb0c57391a86082.png)
(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba9364bb99e1ed7035fd2f6df1fc677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
23-24八年级上·山东济南·期末 查看更多[3]
山东省济南市历下区2023-2024学年八年级上学期期末数学试题山东省济南市历下区2023-2024学年七年级上学期期末数学试题(已下线)考题猜想5-1 一元一次不等式(与不等式有关的参数问题12种类型)-2023-2024学年七年级数学下学期期末考点大串讲(苏科版)
更新时间:2024-02-05 23:13:44
|
相似题推荐
解答题-应用题
|
较难
(0.4)
【推荐1】若点
在直线
上,且
或
,我们就称点
是点
,
的“倍分点”;若点
是点
,
的“倍分点”,同时点
是点
,
的“倍分点”,而点
不是点
,
的“倍分点”,我们就称点
,
互为“伴生倍分点”.
(1)数轴上点
表示数
,点
表示数
,点
,
,
,
分别表示数
,
,
,
,那么点
,
,
,
中是点
,
的“倍分点”的是 ;
(2)数轴上点
表示数
,点
表示数
,点
是数轴上一点,点
表示数
;若点
在点
的左侧,且点
是点
,
的“倍分点”,求数
;若点
在点
的右侧,则点
,
,
中,是否存在“伴生倍分点”?若存在,求出数
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3976d08e5f9e24e76ce9579c06a8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7777a27259d26724229b604df42656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384bef25d6a7f4c661e83498628c1409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30d314a642667fef559032264647366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384bef25d6a7f4c661e83498628c1409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知数轴上两点
对应的数分别为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/86c6dc73-18d9-4a03-ba08-e54463313068.png?resizew=361)
(1)
两点间的距离为 ;
(2)如图
,如果点
沿线段
自点
向点
以每秒
个单位长度的速度运动,同时点
沿线段
自点
向点
以每秒
个单位长度的速度运动,运动时间为
秒.
Ⅰ.运动
秒时
对应的数为 ,
对应的数为 ;(用含
的代数式表示)
Ⅱ.当
两点相遇时,点
在数轴上对应的数是 ;
Ⅲ.求
相距
个单位长度时的
值;
(3)如图
,若点
在数轴上,点
在数轴上方,且
,
,现点
绕着点
以每秒转
的速度顺时针旋转(一周后停止),同时点
沿射线
自点
向点
运动.当
两点相遇时,请直接写出点
的运动速度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46bdbe5072dc5e251fefc55f5113cab5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/86c6dc73-18d9-4a03-ba08-e54463313068.png?resizew=361)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
Ⅰ.运动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
Ⅱ.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
Ⅲ.求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f69b89ffb4dc6c6712cf225890ff62e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154643014b247335f41417d8649f5ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐3】将两个数轴平行放置,并使二者的刻度数上下对齐,再将两个数轴的原点连接起来,就构成一个“双轴系”.定义“双轴系”中两个点A、B的距离.如果A、B两点在同一个数轴上,则二者之间的距离定义和通常的距离一致,
,如果A、B两点分别位于两个数轴上,定义
.
利用“双轴系”定义一种“有向数”,记号是在通常数的右边加上“
”或“
”,例如,“
”表示上层数轴中表示数“2”的点,“
”表示下层数轴中表示数“
”的点,“
”“
”分别表示上下两个数轴的原点.
(1)在双轴系中
与
的距离为:______,
与
的距离为________;
(2)在(1)的假设下,现有只电子蚂蚁甲从“
”所表示的点出发不断跳跃,依次跳至
、
、
、
、
、
、
、
、
、…,另有一只电子蚂蚁乙从“
”所表示的点出发,然后跳跃到
,接着又跳回
其后再次跳到
,下一步又跳回
,按此规律在
和
之间来回跳动.假设两只蚂蚁同时跳跃同时落下,步调一致.
①当蚂蚁甲第3次跳到
所表示的点时,请问此时蚂蚁甲共跳跃了多少次?
②当甲乙两只蚂蚁的距离为
时,请直接写出3个符合条件的跳跃次数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c45b1c50349cb0e320dd627e2094d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b47a0e5b347081cda422b636b382db8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/a19bab85-98af-4029-ae44-61bc46e15528.png?resizew=280)
利用“双轴系”定义一种“有向数”,记号是在通常数的右边加上“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60b79d8e0508249dedb7419e6d9eb59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdab03b9aee587a612289cd33d843827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ece3d2147db0eb257ab2adf4e609c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7a1778b025c6f0d305eb3ccd801ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71819f89fe11f87976003425a8575dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd6bacf8871798ce877767811a983da.png)
(1)在双轴系中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7bffc8ef271d0403c120cf3beb71e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dd3080d775e08a6e8a47e7469047b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ece3d2147db0eb257ab2adf4e609c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7a1778b025c6f0d305eb3ccd801ed6.png)
(2)在(1)的假设下,现有只电子蚂蚁甲从“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71819f89fe11f87976003425a8575dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa85c9993ae3d364850d16cc36983dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94a52fe93c79f654afb8ff5f7e614cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8e483c96de471b837f1c52b1151718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a710f63ca8cdf3c4771ee29abc4723d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e76712386fb9f6511073473adb931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94a52fe93c79f654afb8ff5f7e614cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1706bb7cce6d9f3031bb19c132c7866a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fcaf2fcac557220ec4bb9a2ff5116de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb851740199a4d875df72c690398fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd6bacf8871798ce877767811a983da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1123bd596211a15b001e1966f3be7d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd6bacf8871798ce877767811a983da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1123bd596211a15b001e1966f3be7d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd6bacf8871798ce877767811a983da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd6bacf8871798ce877767811a983da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1123bd596211a15b001e1966f3be7d18.png)
①当蚂蚁甲第3次跳到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94a52fe93c79f654afb8ff5f7e614cf.png)
②当甲乙两只蚂蚁的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9795c683ddf2ded9099eaf887c3d7.png)
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【推荐1】数轴上从左到右的三个点
,
,
所对应的数分别为
,
,
.其中
,
,如图所示.
(1)若以
为原点,写出点
对应表示的数为______,点
对应表示的数为______,并计算
的值.
(2)若原点
在
,
两点之间,求
=______.
(3)若
,求
,
的值.
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579825551040512/2580231715225600/STEM/1f43180f144a43308fe56858b163f95d.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579825551040512/2580231715225600/STEM/e7ace33e27a74fdf950aaab8009bed01.png?resizew=233)
![](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/c5db41a1f31d6baee7c69990811edb9f.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
(1)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b96a09f3ef35dbe550bd085f2c37f2.png)
(2)若原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/7efa96ada03c762a4136ef4b92f07110.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af00bcd73a67804ff31fcb8975be9e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579825551040512/2580231715225600/STEM/1f43180f144a43308fe56858b163f95d.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579825551040512/2580231715225600/STEM/e7ace33e27a74fdf950aaab8009bed01.png?resizew=233)
(备用图)
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【推荐2】特殊与一般是重要的数学方法,当我们遇到复杂问题时,可以通过特殊情况下的分析尝试,积累经验再进行一般化的研究.
(1):若
,则
的值确定吗?若确定,求出确定的值;若不确定,说明理由;
特例分析:当
时,
__________;当
时,
__________;
一般化研究:若
,则
__________;
(2):若
,
,求
的值;
(3):若
,且
,
,
,……,
,
这2024个数中有
个正数,则
的值为__________(用含
的式子表示).
(1):若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901253fc5f1cb0fcddd64f5df4a7c8e7.png)
特例分析:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c382494539aaf2b158fcb3f5b1309ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ea15af97e2d7ccaf5c710c6d3d8cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c382494539aaf2b158fcb3f5b1309ba.png)
一般化研究:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c382494539aaf2b158fcb3f5b1309ba.png)
(2):若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010a4454ab3d2c9dd6bfaf3e52162ea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162849c3ba37c94f4184db3897a2e243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587454d0d38734913ca4aa6d2abd0e62.png)
(3):若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba6b0f8d43e5dc374d9411d4d8acd6c.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/b473071385eefaee85b0b9334e6d94af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd4ed30a6e346b92f00d238f16679f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbc24b62d3f0ce6bb501257fe512524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐3】某班数学兴趣小组探索绝对值方程的解法.
例如解绝对值方程:
.
解:分类讨论:
当
时,原方程可化为
,它的解是
.
当
时,原方程可化
,它的解是
.
∴原方程的解为
或
.
(1)依例题的解法,方程
的解是___________;
(2)在尝试解绝对值方程
时,小明提出想法可以继续依例题的方法用分类讨论的思想把绝对值方程转化为不含绝对值方程,试按小明的思路完成解方程过程;
(3)在尝试解绝对值方程
,小丽提出想法,也可以利用数形结合的思想解绝对值方程,在前面的学习中我们知道,
表示数a,b在数轴上对应的两点A、B之间的距离,则
表示数x与3在数轴上对应的两点之间的距离为5个单位长度,结合数轴可得方程的解是___________;
(4)在理解上述解法的基础上,自选方法解关于x的方程
;(如果用数形结合的思想,需要画出数轴,并加以必要说明).
例如解绝对值方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5f561d1377d4e867d118002ec67789.png)
解:分类讨论:
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dd4309a62b19cbf323384f8e91358f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f786bd2d84233185badb863c63a53c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
∴原方程的解为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
(1)依例题的解法,方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85ac147544ba12c690c9ce5d7157dca8.png)
(2)在尝试解绝对值方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342e44ab6b4cb9a16afa2804fad04d21.png)
(3)在尝试解绝对值方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4784ce39d25d5b2a2c9f3713e4abbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4784ce39d25d5b2a2c9f3713e4abbd5.png)
(4)在理解上述解法的基础上,自选方法解关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bd814a1050c9e546297a480561805e.png)
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解题方法
【推荐1】阅读下列材料:
问题:已知x﹣y=2,且x>1,y<0
解:∵x﹣y=2.∴x=y+2,
又∵x>1∴y+2>1
∴y>﹣1
又∵y<0
∴﹣1<y<0①
∴﹣1+2<y+2<0+2
即1<x<2②
①+②得﹣1+1<x+y<0+2
∴x+y的取值范围是0<x+y<2
请按照上述方法,完成下列问题:
(1)已知x﹣y=3,且x>﹣1,y<0,则x的取值范围是 ;x+y的取值范围是 ;
(2)已知x﹣y=a,且x<﹣b,y>2b,根据上述做法得到-2<3x-y<10,求a、b的值.
问题:已知x﹣y=2,且x>1,y<0
解:∵x﹣y=2.∴x=y+2,
又∵x>1∴y+2>1
∴y>﹣1
又∵y<0
∴﹣1<y<0①
∴﹣1+2<y+2<0+2
即1<x<2②
①+②得﹣1+1<x+y<0+2
∴x+y的取值范围是0<x+y<2
请按照上述方法,完成下列问题:
(1)已知x﹣y=3,且x>﹣1,y<0,则x的取值范围是 ;x+y的取值范围是 ;
(2)已知x﹣y=a,且x<﹣b,y>2b,根据上述做法得到-2<3x-y<10,求a、b的值.
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【推荐2】某旅游团乘坐旅游中巴车以50千米/时的速度匀速从甲地到相距200千米的乙地旅游.行驶了80千米时,车辆出现故障,与此同时,得知这个情况的乙地旅行社立刻派出客车以80千米/时的速度前来接应.相遇后,旅游团用了18分钟从旅游中巴换乘到客车上,随后以v(千米/时)的速度匀速到达乙地.设旅游团离开甲地的时间为x(小时),旅游中巴车距离乙地的路程为y1(千米),客车在遇到旅游团前离开乙地的路程y2(千米).
(1)若v=80千米/时,
①y1与x的函数表达式为 .
②求y2与x的函数表达式,并写出x的取值范围.
(2)设旅游团从甲地到乙地所用的总时间为T(小时),求T(小时)与v(千米/时)的函数关系式(不写v的取值范围).
(3)旅游团要求到达时间比按原来的旅游中巴正常到达乙地的时间最多晚1个小时,问客车返回乙地的车速至少为每小时多少千米?
(1)若v=80千米/时,
①y1与x的函数表达式为 .
②求y2与x的函数表达式,并写出x的取值范围.
(2)设旅游团从甲地到乙地所用的总时间为T(小时),求T(小时)与v(千米/时)的函数关系式(不写v的取值范围).
(3)旅游团要求到达时间比按原来的旅游中巴正常到达乙地的时间最多晚1个小时,问客车返回乙地的车速至少为每小时多少千米?
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【推荐1】我们约定:若点P的坐标为
,则把坐标为
的点
成为点P的“k阶益点”(其中k为正整数),例如:
即
就是点
的“2阶益点”.
(1)已知点
是点
的“3阶益点”,求点P的坐标;
(2)已知点P2是点
的“2阶益点”,将点P2先向右移动6个单位,再向下移动3个单位得到点Q,若点Q落在第四象限,求t的取值范围;
(3)已知点
的“k阶益点”是
,若
,求符合要求的点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8462e0623b6e76db8ad6bae972a2d4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf99487d7860d017c0747ff966edfd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be35b0eefdaa22bcd5680b6ba56ff2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a8bce5deebcb7c58cf727d5f60e75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15663c6e72c340f96df4a7efdb8e9665.png)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c94e5161b7331da51b5bebe14e6dc44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
(2)已知点P2是点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b555725cbe7ed1042d3af96ac06725.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c743d74aa734e8481092c10abcaaa9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d0f9a0987581ad73807e8f21a3ae52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc783b0a86bf3daf066e1007a2efed42.png)
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【推荐2】若点
的坐标满足
.
(1)当
,
时,求点
的坐标;
(2)若点
在第二象限,且符合要求的整数
只有三个,求
的取值范围;
(3)若点
为不在
轴上的点,且关于
的不等式
的解集为
,求关于
的不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e192a7fd52db9040f57e12ebf0b2.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b4d9935404fc493378a1439ef3178f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a77b3a05ebfaa83b6ee433057471ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e0ccf8652f0e00ceba081754e11bca.png)
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