同学们都知道,
表示5与
之差的绝对值,实际上也可理解为5与
两数在数轴上所对的两点之间的距离.试探索:
(1)
;当
时,
.
(2)
表示 与 之间的距离;
表示 与 之间的距离;找出所有符合条件的整数x,使得
,这样的整数有 (直接写出答案)
(3)由以上探索,请你结合数轴猜想:对于任何有理数x,
是否有最小值?如果有,写出最小值;如果没有,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ba690de4bdbdceb968265181a208f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f3b34ad28edc1109cc8a53ac6ecd1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1409864a382c28a3f7b78399653dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be80faf746b256c756264a51b9ba3e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b4feb90b84eb54fe644c596f5156a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8a1bc20fe03f4d10a29c0114eba353.png)
(3)由以上探索,请你结合数轴猜想:对于任何有理数x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a7032faeee89ddf0980f9e0df0d9d9.png)
2022七年级上·全国·专题练习 查看更多[1]
(已下线)第一次月考难点特训(二)和绝对值的几何意义有关的压轴题-【微专题】2022-2023学年七年级数学上册常考点微专题提分精练(北师大版)
更新时间:2022-12-18 15:09:13
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名校
【推荐1】在有些情况下,不需要计算出结果也能把绝对值符号去掉,例如:|6+7|=6+7;|7-6|=7-6;|6-7|=-6+7;|-6-7|=6+7
(1)根据上面的规律,把下列各式写成去掉绝对值符号的形式:
①|7+2|= ;
②|-
+
|= ;
(2)用简单的方法计算:|
-
|+|
-
|+|
-
|+……+|
-
|.
(1)根据上面的规律,把下列各式写成去掉绝对值符号的形式:
①|7+2|= ;
②|-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
(2)用简单的方法计算:|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566aa5510995d49577ed20eae12fa066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd209afb2cdb0743fd5f7367648ae83.png)
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【推荐2】(1)若a是最大的负整数,b是绝对值最小的数,c是倒数等于它本身的正数,d是9的负平方根.则
;
;
;
.
(2)已知一个正数的两个平方根是
和
.求
的平方根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
(2)已知一个正数的两个平方根是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3354269baaffd727561b0fdd5b0822d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe8438e1219558c68560dc6a295a278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d62e0a65306447ed06556dd97097e7.png)
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【推荐1】已知
互为倒数,
互为相反数,c的绝对值为2,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b4218f00da487d3f63b9360144708f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26928cf441445732a644b4a3a8197196.png)
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【推荐2】在抗洪抢险中,解放军战士的冲锋舟加满油沿东西方向的河流抢救灾民.冲锋舟早晨从A地出发,晚上到达B地,约定向东为正方向,当天的航行路程记录如下(单位:km):
,
,
,
,
,
,
,
(1)请你帮忙确定B地在A地的什么方向,距离A地多少千米?
(2)若冲锋舟每千米耗油0.5L,油铅容量为28L,则冲锋舟在当天救灾过程中至少还需补充多少升油?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f057d3232d8d946dc14c3e14aa5ee3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3aab28a20b5bf47040aaec03b1eb550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6489852d310f01375f213b3bdf0406c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a94acdfb41489d5694b5a64b9e99754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a7552f043aacca84d0ac1afd55a676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e35f76e01c3979ae5987f7729f9856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
(1)请你帮忙确定B地在A地的什么方向,距离A地多少千米?
(2)若冲锋舟每千米耗油0.5L,油铅容量为28L,则冲锋舟在当天救灾过程中至少还需补充多少升油?
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【推荐1】小王驾车从
地出发,在一条东西方向的道路上行驶,先行驶
千米,接着又行驶
千米,最后行驶
千米后停止行驶,规定:向东行驶记作正,向西行驶记作负,例如:行驶
千米,即向西行驶1千米.
(1)当
时,小王最后停在
地_____(填“东”或“西”)侧____千米的位置;
(2)当
_____时,小王最后恰好停在
地;
(3)小王驾车平均每千米耗油0.1升,当
时,求小王驾车共耗油多少升,(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76adc2b77ccec952aa12782fdb6e9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98d53f32d86cc0aee11cad898aaa576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b624d88827e92e12bc0a8f1067cbe72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)小王驾车平均每千米耗油0.1升,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3002ad1638f25e355d70d5ab63e637f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】解答题
(1)计算:
.
(2)若用点
、
、
分别表示有理数
、
、
如图:
①判断下列各式的符号:
_________0;
___________0.(填“
”或“
”)
②化简
.
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db78aee98e57f484cb5c52cf3cb064c.png)
(2)若用点
![](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://img.xkw.com/dksih/QBM/editorImg/2023/7/7/847522e7-4b76-4684-97db-9f1da1d9f239.png?resizew=226)
①判断下列各式的符号:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa17a39f52e09981729af4439ca535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
②化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c137f06eabf4498625b233eb831b1772.png)
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【推荐1】如图,直线
:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4689e9b7087b8bdc4df4e9f5019cfe42.png)
与直线
:
交于点
,直线
分别交
轴、
轴于点
、
,直线
交
轴于点
.
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609952589234176/2611815734034432/STEM/f767ed76468f453e80191f50a2bc9c73.png?resizew=213)
(1)求
、
的值.
(2)请直接写出使得不等式
成立的
的取值范围.
(3)在直线
上找点
,使得
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4689e9b7087b8bdc4df4e9f5019cfe42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3cb77304ba3546c1fc629832f1b811f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadb7b1fbcdec6c23500176f4bb30906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c0980761f2c189bb51b9c12a79d77d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609952589234176/2611815734034432/STEM/f767ed76468f453e80191f50a2bc9c73.png?resizew=213)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)请直接写出使得不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee25cb25f2a2c42dd4601acb41741834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06d5a29159242617f01e84eb59b7f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】我们知道,
表示数a到原点的距离,这是绝对值的几何意义.进一步地,数轴上两个点A,B,所对应的数分别用a,b表示,那么A,B两点之间的距离表示为
.回答以下问题:
(1)数轴上表示x和-1的两点P,Q之间的距离是 ,如果
,那么x的值为 ;
(2)如图,数轴上从左到右的三个点A,B,C所对应的数分别为a,b,c.其中AB=27,BC=10.若原点O在A,B两点之间,则
;
(3)在(2)题条件下,若O是原点,且OB=7,求a+b-c的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afd4acb164aad6d5a73989f5412730b.png)
(1)数轴上表示x和-1的两点P,Q之间的距离是 ,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3d196cfee8345bd28a2f3814b676f5.png)
(2)如图,数轴上从左到右的三个点A,B,C所对应的数分别为a,b,c.其中AB=27,BC=10.若原点O在A,B两点之间,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab29a75c0c3e68c174976ea04c6d523.png)
(3)在(2)题条件下,若O是原点,且OB=7,求a+b-c的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/d09232ba-2e90-494b-87f2-ef4128483318.png?resizew=279)
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【推荐3】已知点
,
在数轴上分别表示有理数
,
,
,
两点之间的距离表示为
,当
,
两点中有一点在原点时,不妨设点
在原点,如图1,
,当
,
两点都不在原点时:
①如图2,点
,
都在原点右边,
;
②如图3,点
,
都在原点左边,
;
③如图4,点
,
在原点两边,
.
综上所述,数轴上
,
两点之间的距离表示为
.
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
的两点之间的距离是______
(3)数轴上表示
和5的两点之间的距离是______(以上三个空填数值)
(4)若数轴上表示
和
的两点
,
之间的距离为3,求
的值.
![](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/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/3f4dfec890cdfdda355e19463f3be813.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/1cdb7860ac5286a7a8b8d435c1ecc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①如图2,点
![](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/de837eb8d6211ce9430a60f1af6b886a.png)
②如图3,点
![](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/0f33d0aa85cba0987e287e8920156c50.png)
③如图4,点
![](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/d329b860b249c2211a7f2c034469300a.png)
综上所述,数轴上
![](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/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/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
(3)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(4)若数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0678cebfe1ecf5f823c25b68c2a5446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bedd2997416e1ee39421d40d1940cc1.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/665d968b-6720-4282-83cc-296574b9e3f7.png?resizew=420)
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