数轴上表示数x的点与原点的距离,记作
.
(1)数轴上表示数x的点与表示
的点的距离,可以记作___________;
(2)当
时,
的值为___________;当
时,
的值为___________;当
时,
的值为___________.
(3)当x分别取
,
,……,请你计算
的值,然后观察,思考并得出结论:对于有理数a,当x取任意一对相反数m与
的值时,
的两个值的关系是___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc51e97939a8966daa015535a801561.png)
(1)数轴上表示数x的点与表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ff3197b194e98d97d0bdad651b085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ff3197b194e98d97d0bdad651b085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ff3197b194e98d97d0bdad651b085.png)
(3)当x分别取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b8bee40319fe80e512d221cfe252a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab76dc75e249530e5ff939dc1135cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ff3197b194e98d97d0bdad651b085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93129dde5fa5cd84e3702e457535e274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502df97bc4dae710c358b00e69ec08e7.png)
更新时间:2022-10-27 16:52:28
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知实数
表示在数轴上对应的位置为点
,现对点
进行如下操作:先把点
沿数轴以每秒1个单位的速度向左移动
秒,再把所得到的点沿数轴以每秒2个单位的速度向右移动
秒,得到点
,我们把这样的操作称为点
的“回移”,点
为点
的“回移点”.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981466051502080/2987179596988416/STEM/3b30bda2-c130-4d0e-a95f-6625d4594887.png?resizew=148)
(1)用含有字母
,
的式子写出“回移点”
表示的数__________;(填空)
(2)当
时,
①若
,求点
的回移点
表示的实数;
②若回移点
与点
恰好重合,求
的值;
(3)当
时,若回移点
与点
相距7个单位长度,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70444e3a66d1068038c5b5a77c7954aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9454574ca7215c2c2156005bceeb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9454574ca7215c2c2156005bceeb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981466051502080/2987179596988416/STEM/3b30bda2-c130-4d0e-a95f-6625d4594887.png?resizew=148)
(1)用含有字母
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9454574ca7215c2c2156005bceeb0b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9454574ca7215c2c2156005bceeb0b.png)
②若回移点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9454574ca7215c2c2156005bceeb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9454574ca7215c2c2156005bceeb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】如图,已知数轴上有三点
,若用
表示A、B两点的距离,
表示
两点的距离且
,点A、点C对应的数是分别是
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/9f01250b-9925-40c8-926e-eb0323854616.png?resizew=201)
(1)线段
的长度为_____________个单位长度;
(2)若点
分别从
两点同时出发向左运动,速度分别为3个单位长度每秒、5个单位长度每秒,则运动了多少秒时,Q到B的距离与P到B的距离相等?
(3)若点
仍然以(2)中的速度分别从
两点同时出发向左运动,2秒后,得到线段
与线段
,点M为线段
的中点,点N为线段
的中点,若线段
与线段
从此时的位置上同时出发分别以2个单位长度每秒、3个单位长度每秒的速度都向左运动,动点R以1个单位长度每秒的速度从A点出发向右运动,在线段
追上线段
之前,点R运动了多少秒时恰好满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245c24bc367dadfa17a54f98b6552af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a622b6dd9af118f839ca197e077e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e3ea2bdbcb1c0ed78b868c4a13ab76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/9f01250b-9925-40c8-926e-eb0323854616.png?resizew=201)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e02463731ac35391cb35b0599e209.png)
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【推荐3】已知在纸面上有一数轴(如图),折叠纸面,若数轴上数1表示的点与数
表示的点重合,则数轴上数
表示的点与数2表示的点重合,根据你对例题的理解,解答下列问题:
若数轴上数
表示的点与数0表示的点重合.(根据此情境解决下列问题)
(1)则数轴上数2表示的点与数_______表示的点重合;
(2)若点
在数轴上对应的数为
,且
,并且
两点经折叠后重合,求
点表示的数;
(3)若数轴上
两点之间的距离为2022,并且
两点经折叠后重合,如果
点表示的数比
点表示的数大,则
点表示的数为____,
点表示的数____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/11/8ded2f14-a947-489d-89bd-f9dd1d51acc8.png?resizew=480)
若数轴上数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
(1)则数轴上数2表示的点与数_______表示的点重合;
(2)若点
![](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/cb3f8e3953d16f9030880a789acaab28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)若数轴上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】实数
、
在数轴上所对应的点的位置如图所示:化简
.
![](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/0fa96a14c37f061a02f01ff426bd07a4.png)
![](https://img.xkw.com/dksih/QBM/2019/4/30/2193506622046208/2194761068953601/STEM/0722b9cf62304d7bbd16718dfaebd742.png?resizew=194)
您最近一年使用:0次
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【推荐1】计算:
(1)
;
(2)
;
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5292f91521fee232dcdea7baa92cd44.png)
(4)
;
(5)
;
(6)
;
(7)
;
(8)
;
(9)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7389fe7cbf5f1fc3ff99f9f2953c40.png)
(10)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c5a9ca81369a372db4dd4804b0f243.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637608c47a6a67aaaed6f4750040123c.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5292f91521fee232dcdea7baa92cd44.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b274aa1e73ea2f6990e277bdddcbea1.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe68107dddd772bc897a94d89798b9b9.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4517775edaa281dc4938c28e8995a7cf.png)
(7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d699f6d81d9bba7fbfc447503100ed33.png)
(8)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693becbb8d6e552a3da6ef42c3bbf664.png)
(9)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7389fe7cbf5f1fc3ff99f9f2953c40.png)
(10)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00870f9bfadba88916bd52e058b1ddb.png)
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名校
【推荐2】【材料阅读】高斯上小学时,有一次数学老师让同学们计算“从1到100这100个正整数的和”.许多同学都采用了依次累加的计算方法,计算起来非常繁琐,且易出错.聪明的高斯经过探索后,给出了下面的解答过程:
解:设
,①
则
.②
①+②,得(即左右两边分别相加):
.
所以,
.
所以,
.
后来人们将高斯的这种解答方法概括为“倒序相加法”.
【问题解决】利用“倒序相加法”解答下面的问题:
(1)计算:
_________;
(2)猜想:
__________并利用“倒序相加法”说明理由.
(3)利用(2)中的结论,计开:
.
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8909dacb60f7e5850eaf5638ee2daae0.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbbc06cd780147be07eef217ddf7cae.png)
①+②,得(即左右两边分别相加):
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2720b8da7ddf7ffc2a31d547d231a1a4.png)
所以,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac2bbdf4404ddd3b0b11a87de7e417a.png)
所以,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b11870a1430204997628166f8439b04.png)
后来人们将高斯的这种解答方法概括为“倒序相加法”.
【问题解决】利用“倒序相加法”解答下面的问题:
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77832062033d763120e6ebc9aecb4e8d.png)
(2)猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78737bcff77c9e967bea206d11bd994e.png)
(3)利用(2)中的结论,计开:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11308ebc371e62986f7e2d6b53b9409.png)
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名校
【推荐1】有理数a、b、c在数轴上的位置如图.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/9405ef26-ef71-42b3-aebe-3ea2e3d1ac0d.png?resizew=226)
(1)用“
”或“
”填空:
0,
0,
0.
(2)化简:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/9405ef26-ef71-42b3-aebe-3ea2e3d1ac0d.png?resizew=226)
(1)用“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa17a39f52e09981729af4439ca535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea712984ea5017140e20bee226fd5af.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ecbd0196a37d606691bd6591cbd7ce.png)
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【推荐2】知|x+3|与|2y﹣3|互为相反数,求x﹣y的值.
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