已知:
,c比b大2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/a5304f71-e81b-4144-b770-7125b03a7543.png?resizew=483)
(1)
______,
______,
______.
(2)在数轴上,点A,B,C分别对应实数a,b,c.
①数轴上点P到点A的距离是点P到点B的距离的2倍,求点P对应的数.
②动点M从点A出发以4个单位速度向右运动,动点N从点B出发以1个单位速度向右运动,点D在数轴上对应的数是10,动点M与动点N同时出发,当M运动到D后立即以原来的速度向左运动,当点M到达出发点A时,两个动点同时停止运动,设运动时间是t,当
______时,M、N两点到点C的距离相等(直接写出t的值).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2468f9eced6e0c1eabeccaa5d8e995e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/a5304f71-e81b-4144-b770-7125b03a7543.png?resizew=483)
(1)
![](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)
(2)在数轴上,点A,B,C分别对应实数a,b,c.
①数轴上点P到点A的距离是点P到点B的距离的2倍,求点P对应的数.
②动点M从点A出发以4个单位速度向右运动,动点N从点B出发以1个单位速度向右运动,点D在数轴上对应的数是10,动点M与动点N同时出发,当M运动到D后立即以原来的速度向左运动,当点M到达出发点A时,两个动点同时停止运动,设运动时间是t,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
更新时间:2024-01-26 07:53:59
|
相似题推荐
解答题-问答题
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名校
【推荐1】我们知道,
可以理解为
,它表示:数轴上表示数
的点到原点的距离,这是绝对值的几何意义.进一步地,数轴上的两个点
,分别用数
表示,那么
两点之间的距离为
,反过来,式子
的几何意义是:数轴上表示数
的点和表示数
的点之间的距离.利用此结论,回答以下问题:
(1)数轴上表示数8的点和表示数3的点之间的距离是_________,数轴上表示数
的点和表示数
的点之间的距离是__________.
(2)数轴上点
用数
表示,若
,那么
的值为_________.
(3)数轴上点
用数
表示:
①若
,那么
的值是________.
②当
时,数
的取值范围是________,这样的整数
有________个.
③
有最小值,最小值是___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f50db7df4039c3fb42c49ea377228c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e41afc344dae839bbe6ba72828da5d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6177dde43e06131a15591560a57608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a493850638eef5019f51f458a780d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(1)数轴上表示数8的点和表示数3的点之间的距离是_________,数轴上表示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(2)数轴上点
![](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/0a6936d370d6a238a608ca56f87198de.png)
(3)数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c19aa34e1898e43c42897a35c49bcac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4700c782be7bbbe1c1bc54a2491734bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789dc3d614fbf72e3177ae9309a23c06.png)
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【推荐2】如图,数轴上点A所表示的数是
,有甲、乙两只电子蚂蚁,同时从点A出发向右运动.甲刚开始10秒钟,以每秒6个单位长度的速度运动,然后以开始时速度的
运动10秒,最后又以比开始时增加
的速度快速行走10秒钟.乙的运动速度是每秒5个单位长度.若设甲行走时间为t(秒),行走的路程为s(单位长度).
![](https://img.xkw.com/dksih/QBM/2022/12/9/3127142362873856/3158913004077056/STEM/090335eff66f47b4b0d715e66be6acd6.png?resizew=273)
(1)请用含t的代数式表示s:
①当行走时间在10秒钟内时,
;
②当行走时间在10至20秒钟时,
;
③当行走时间大于20至30秒钟时,
.
(2)若甲、乙出发后在B处相遇,则点B所表示的数是 .
(3)求t为何值时,甲、乙相距8个单位长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab66291ef17f0d1664cefd6f6bffd31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2022/12/9/3127142362873856/3158913004077056/STEM/090335eff66f47b4b0d715e66be6acd6.png?resizew=273)
(1)请用含t的代数式表示s:
①当行走时间在10秒钟内时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c7e7449010436e00dce3b6924a4258.png)
②当行走时间在10至20秒钟时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c7e7449010436e00dce3b6924a4258.png)
③当行走时间大于20至30秒钟时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c7e7449010436e00dce3b6924a4258.png)
(2)若甲、乙出发后在B处相遇,则点B所表示的数是 .
(3)求t为何值时,甲、乙相距8个单位长度.
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【推荐1】已知数轴上点
在原点的左边,到原点的距离为4,点
在原点右边,从点
走到点
,要经过16个单位长度.
(1)写出
、
两点所对应的数;
(2)若点
也是数轴上的点,点
到点
的距离是点
到原点距离的3倍,求
对应的数;
(3)已知点
从点
开始向右出发,速度每秒1个单位长度,同时
从
点开始向右出发,速度每秒2个单位长度,设线段
的中点为
,线段
的值是否会发生变化?若会,请说明理由,若不会,请求出求其值.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c5db41a1f31d6baee7c69990811edb9f.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dbfcff5c8b5d4e312a9247b2b8b0a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ad3a610ced720c3f7803fedfbef09d.png)
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【推荐2】如图,已知数轴上点A表示的数为8,B是数轴上一点,且AB=22.动点P从点A出发,以每秒4个单位长度的速度沿数轴向左匀速运动,设运动时间为t(t>0)秒.
(1)写出数轴上点B表示的数____,点P表示的数____(用含t的代数式表示);
(2)若动点Q从点B出发,以每秒2个单位长度的速度沿数轴向左匀速运动,若点P、Q同时出发,问点P运动多少秒时追上点Q?(列一元一次方程解应用题)
(3)若动点Q从点B出发,以每秒2个单位长度的速度沿数轴向右匀速运动,若点P、Q同时出发,问 秒时P、Q之间的距离恰好等于2(直接写出答案)
(4)思考在点P的运动过程中,若M为AP的中点,N为PB的中点.线段MN的长度是否发生变化?若变化,请说明理由;若不变,请你画出图形,并求出线段MN的长.
(1)写出数轴上点B表示的数____,点P表示的数____(用含t的代数式表示);
(2)若动点Q从点B出发,以每秒2个单位长度的速度沿数轴向左匀速运动,若点P、Q同时出发,问点P运动多少秒时追上点Q?(列一元一次方程解应用题)
(3)若动点Q从点B出发,以每秒2个单位长度的速度沿数轴向右匀速运动,若点P、Q同时出发,问 秒时P、Q之间的距离恰好等于2(直接写出答案)
(4)思考在点P的运动过程中,若M为AP的中点,N为PB的中点.线段MN的长度是否发生变化?若变化,请说明理由;若不变,请你画出图形,并求出线段MN的长.
![](https://img.xkw.com/dksih/QBM/2019/2/3/2132767793233920/2137251332669440/STEM/527748413cec4ec19367c33c44f7c236.png?resizew=327)
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【推荐3】如图,在一条直线上,从左到右依次有点
、
、
,其中
,
.以这条直线为基础建立数轴、设点
、
、
所表示数的和是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/16933531-cc5c-4fd3-834c-5d05dcf08000.png?resizew=280)
(1)如果规定向右为正方向;
若以
的中点为原点
,以
为单位长度建立数轴,则
___________;
若单位长度不变,改变原点
的位置,使原点
在点
的右边,且
,求
的值;并说明原点每向右移动
,
值将如何变化?
若单位长度不变,使
,则应将
中的原点
沿数轴向___________方向移动___________
;
若以
中的原点为原点,单位长度为
建立数轴,则
___________.
(2)如果以
为单位长度,点
表示的数是
,则点
表示的数是___________.
![](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/7df3b2901ad26337818f75e81448ebb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eee6f84b2af5e06da1cd3d0a1f3a0f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/16933531-cc5c-4fd3-834c-5d05dcf08000.png?resizew=280)
(1)如果规定向右为正方向;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4cc922ab678a038dbe0abbd586eec01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0961044af992264b2f5c1bcbabb1f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8b8edd94bc4d5d517ec77e56800e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cb0fd41dc169e777b2f068607feed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
(2)如果以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐1】在平面直角坐标系中,已知
,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/d7e7d5c6-1269-485c-826e-48085010a7f8.png?resizew=396)
(1)写出
两点的坐标;
(2)如图1,已知坐标轴上有两个动点
同时出发,
点从
点出发沿
轴负方向以每秒1个单位长度的速度移动,
点从
点出发以每秒3个单位长度的速度沿
轴正方向移动,点
为线段
上一点.设运动时间为
秒.问:是否存在这样的
,使
?若存在,请求出
的值;若不存在,请说明理由.
(3)如图2,点
是第二象限上的点,连
,点
是线段
上一点,满足
.点
是射线
上一动点,连
,交直线
于点
,当点
在射线
上运动的过程中,求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8623c63099734fcf3054a0ca9712bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47c0748a6a48c565e8d6346303dc14c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/d7e7d5c6-1269-485c-826e-48085010a7f8.png?resizew=396)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(2)如图1,已知坐标轴上有两个动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c2df1ec4f5d17fa8590e920fac61af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ebd1d359040a1172a944ded96ed0127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b80edf4c6642c5cc9fd14597898718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/440eb5e793336330662561bc5b17e65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ea8128187ccc434c68cc9eb393b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaf8ceca9b6ecd615e91bbe0af84e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a3d419c619743fa7b7eaedd1838efb.png)
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解答题-问答题
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【推荐2】如图,在平面直角坐标系中,已知
,
,其中a,b满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/e204cce9-8f79-41dd-b04d-ba9fb7fc28bb.png?resizew=191)
(1)填空:
______,
______;
(2)如果在第三象限内有一点
,请用含m的式子表示
的面积;
(3)在(2)的条件下,
的连线交y轴于点P,判断
的值是否为定值,若不是请说明理由;若是请求出其定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5612d598e27ac2ce0ab89fb63538bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30e61b6ae106a11cbffbab3015c2d46.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/e204cce9-8f79-41dd-b04d-ba9fb7fc28bb.png?resizew=191)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)如果在第三象限内有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e16d691397d33e3c814d43e167384d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
(3)在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17f0643d0e1b253d0343c45915a4b2e.png)
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名校
【推荐3】从今年开始,“金鸡百花电影节”长期落户厦门,为了主场馆更好的灯光效果,工作人员设计了灯光组进行舞台投射.其中一组灯光如图所示,灯A射线从AM开始顺时针旋转至AN便立即回转,灯B射线从BP开始顺时针旋转至BQ便立即回转,两灯不停交叉投射.若灯A转动的速度是a°/秒,灯B转动的速度是b°/秒,且a、b满足|a-3b|+(a+b-4)2=0.假定舞台前后幕布是平行的,即PQ∥MN,且∠BAN=45°
(1)求a、b的值;
(2)若灯B射线先转动20秒,灯A射线才开始转动,在灯B射线到达BQ之前,A灯转动几秒,两灯的光束互相平行?
(3)如图,两灯同时转动,在灯A射线到达AN之前.若射出的光束交于点C,过C作CD⊥AC交PQ于点D,则在转动过程中,∠BAC与∠BCD的数量关系是否发生变化?若不变,请求出其数量关系;若改变,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/4/26/1674120696528896/1679735107624960/STEM/87c051b3-196e-4c03-a250-66ac082486e8.png?resizew=479)
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【推荐2】阅读下列材料:
我们知道
的几何意义是在数轴上表示数a的点与原点的距离,
也就是表示数a与数0的两点之间的距离,
表示数轴上表示数a与数b的两点之间的距离.
例1.已知
,求x的值.
解:在数轴上与原点距离为2的点对应数是为
和2,即x的值为
和2.
例2.已知
,求x的值.
解:在数轴上与1的距离为2的点对应数为3和
,即x的值为3和
.
依照阅读材料的解法,完成下列各题:
(1)若
,则
________,若
,则
________;
(2)
的最小值是________,若
,则
________;
(3)代数式
的最小值为________;
(4)求代数式
的最小值.
我们知道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d163110e75cf8a4c5146d2a609f80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/5448bab1-f21f-46d8-bb2c-135385a5f19d.png?resizew=312)
例1.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e23117608becdb000a9812d7fe9821.png)
解:在数轴上与原点距离为2的点对应数是为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
例2.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015bb51577c2c3c63d40e5b3f0ed5b93.png)
解:在数轴上与1的距离为2的点对应数为3和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
依照阅读材料的解法,完成下列各题:
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ba338ee0ef6b08754fc1b1225ba514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3036e0abea8bfbeb4f39e54678fdd6c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cfb936d8d761ccbe51b7892bd898a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617aaad1fac4a6b2532c59c8c6e8d218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(3)代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78360b4132367a65319d476a5af8a5a.png)
(4)求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85ee3422a9c8bdf221bd9b0f24ea75f.png)
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【推荐3】有一台单功能计算器,对任意两个整数只能完成求差后再取绝对值的运算,其运算过程是:输入第一个整数
,只显示不运算,接着再输入整数
后,显示
的结果.比如依次输入
,
,则输出的结果是
;此后每输入一个整数都是与前次显示的结果进行求差后再取绝对值.
(1)若小明依次输入
,
,
,则最后输出的结果是多少?
(2)若将
,
,
,
这
个整数任意地一个一个地输入,全部输入完毕后显示的结果的最大值是多少?最小值是多少?
(3)若任意地一个一个地输入三个互不相等的正整数
,
,
,全部输入完毕后显示的最后结果为
,已知
的最大值为
,求
的最小值.
![](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/3e86e6f0ac5903369afea2c8d04ba412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42340e142837bb1d3820ef0eed302bef.png)
(1)若小明依次输入
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
(3)若任意地一个一个地输入三个互不相等的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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