我们知道:点
,
在数轴上分别表示有理数
,
,
,
两点之间的距离表示为
,在数轴上
两点之间的距离
.请回答下列问题:
(1)数轴上表示-1和3的两点之间的距离是_________.
(2)数轴上表示
和2的两点之间的距离为3,则有理数
是_________.
(3)若
表示一个有理数,且
,则
_________.
(4)若
,则
的值为_________.
(5)式子
的最小值为_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21f81fbd144ca37738414133b6d7a7d.png)
(1)数轴上表示-1和3的两点之间的距离是_________.
(2)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3dfddbedd9c572243bd527d135d0c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e27e3bbf631569f53132cddb5e058dc.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7216b7850b001ddf2318f2b1c2a672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
(5)式子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e509f9495bc96ea775cb241f62aea5.png)
更新时间:2022-10-12 14:43:45
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解答题-问答题
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【推荐1】数轴是一个非常重要的数学工具,它使数和数轴上的点建立起对应关系,揭示了数与点之间的内在联系,它是“数形结合”的基础.小明在草稿纸上画了一条数轴进行操作探究:
操作一:
(1)如图1,在数轴上,三个有理数从左到右依次是
,m,
,利用刻度尺或圆规,在数轴上画出原点O;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/62d79582-baee-491c-b6d8-673b4086cb7b.png?resizew=250)
操作二:
(2)折叠这条数轴所在纸面,若使
表示的点与数3与表示的点重合,数m表示的点与数
表示的点重合,则
;
操作三:
(3)从数轴上剪下9个单位长度(从
到8)的部分(不考虑宽度),并把这条数轴沿数m所在点竖直折叠,然后在重叠部分某处剪开,得到三条线段. 若这三条线段的长度之比为
,求m的值.
操作一:
(1)如图1,在数轴上,三个有理数从左到右依次是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0623207595425920f16e76a7f8f268b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/62d79582-baee-491c-b6d8-673b4086cb7b.png?resizew=250)
操作二:
(2)折叠这条数轴所在纸面,若使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb10bc4abf30c687aee08b43708a15d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
操作三:
(3)从数轴上剪下9个单位长度(从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837ee3d39675edb86ec351022b66dacf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/29ae5c4d-9113-4b7a-8da3-5d68bbe5fc90.png?resizew=406)
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名校
【推荐2】如图,有两条线段,
(单位长度),
(单位长度)在数轴上,点A在数轴上表示的数是
,点D在数轴上表示的数是15.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/ddff6023-2788-43f6-b0f3-13689f2f81d9.png?resizew=318)
(1)点B在数轴上表示的数是 ,点C在数轴上表示的数是 ;
(2)若线段
以1个单位长度/秒的速度向左匀速运动,同时线段
以2个单位长度秒的速度也向左匀速运动,设运动时间为t秒,当t为何值时,点B与点C之间的距离为1个单位长度?
(3)若线段
、线段
分别以1个单位长度/秒、2个单位长度/秒的速度同时向左匀速运动,与此同时,动点P从
出发,以4个单位长度/秒的速度向右匀速运动.设运动时间为t秒,当
时,
的值是否发生变化?若不变化,求出这个定值,若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e35f76e01c3979ae5987f7729f9856.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/ddff6023-2788-43f6-b0f3-13689f2f81d9.png?resizew=318)
(1)点B在数轴上表示的数是 ,点C在数轴上表示的数是 ;
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91498d22fa9e1bae4ee8399259d9cfd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c104d9088486ac1a7072482d2167aa52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e43d9635811fa256052310d9a8bb14d.png)
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【推荐1】点A,B,C在数轴上的位置如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/f4568ae1-b14d-46df-978d-3880ca4ee11b.png?resizew=231)
(1)若点A,B,C分别表示有理数a,b,c.
①比较
,b,c的大小(用“
”连接);
②比较大小:
__________0,
__________0(填“
”“
”或“
”);
(2)若有理数m,n,p各自对应着A,B,C三点中的某一点,且
,
,
,那么表示有理数n的为点__________.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/f4568ae1-b14d-46df-978d-3880ca4ee11b.png?resizew=231)
(1)若点A,B,C分别表示有理数a,b,c.
①比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f50db7df4039c3fb42c49ea377228c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88d96305479dfeb3f37dc044cf48548.png)
②比较大小:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13502d46b8563c54c09b29b20b3006a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcac19b668b6084ed7da530bacab7a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88d96305479dfeb3f37dc044cf48548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)若有理数m,n,p各自对应着A,B,C三点中的某一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bdc69abbcdf98c42b649f8d8d4cd1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1218eda19f74a1ed50ab106265c6621f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f2c0bbf8141d4d809713f77faecd02.png)
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【推荐1】已知关于
的多项式
是四次三项式,按要求回答下列问题:
(1)求
的值
(2)该多项式与另一个多项式的和为
求另一个多项式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215ef7a4f0823d9cfba51d00b4558cd1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4844da7b10174c5744e18f77649d035.png)
(2)该多项式与另一个多项式的和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0654851709f818c7f8eeadeac4ae943.png)
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【推荐2】化简及求值:
(1)化简:
;
(2)先化简,再求值:
的值,其中
,
.
(1)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e8487fd8db7192bc6f375ca92f0af1.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4271ecf6c0f494970e7a78613e46aa8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d0aa9412dd7caf42cc71520e282328.png)
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【推荐1】解下列方程
(1)3x﹣1=2﹣x (2)
﹣
=1
(3)
(4)
(1)3x﹣1=2﹣x (2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d90dc76770e5b845b3ee524f12079a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eac68f4a19877780e2f789738626ed.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436dedf5de5ad564b56276128fb23703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10314416b8684acbc1059de4bc220969.png)
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【推荐2】解方程:
(1)x﹣3=
x+1;
(2)x﹣
=2+
.
(1)x﹣3=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(2)x﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f82a771300973beb7f643aaf0a94a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d989290c2eb8f7e1c73445876bf04.png)
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