在一条水平直线上,自左向右依次有四个点A,B,C,D,
,线段
以每秒
的速度水平向右运动,当点A到达点D时,线段
停止运动,设运动时间为t秒.
(1)当
秒时,
___________
,
=___________
;
(2)当线段
与线段
重叠部分为
时,求t的值;
(3)当
秒时,线段
上是否存在点P,使得
?若存在,求出此时
的长,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62de35edf01f266838978a15dd8efd40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372907693e25eead2395b1a69fef42c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372907693e25eead2395b1a69fef42c4.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13489cf349ee6c94f352a0a1fe971103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72ff812f31af36e71865489e32b02ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
更新时间:2023-02-21 21:52:42
|
相似题推荐
解答题-问答题
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(0.4)
名校
【推荐1】已知数轴上A,B,C三个点表示的数分别是a,b,c,且满足
,动点P、Q都从点A出发,且点P以每秒1个单位长度的速度向终点C移动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/173213f9-16da-4762-96bf-da095cb47f56.png?resizew=232)
(1)直接写出a= ,b= ,c= ;
(2)若M为
的中点,N为
的中点,试判断在P点运动的过程中,线段
的长度是否发生变化,请说明理由;
(3)当点P运动到点B时,点Q再从点A出发,以每秒3个单位长度的速度在A,C之间往返运动,直至P点停止运动,Q点也停止运动.当P点开始运动后的第 秒时,P,Q两点之间的距离为2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591d42a8481d93d0735ef59e294ae9c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/173213f9-16da-4762-96bf-da095cb47f56.png?resizew=232)
(1)直接写出a= ,b= ,c= ;
(2)若M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)当点P运动到点B时,点Q再从点A出发,以每秒3个单位长度的速度在A,C之间往返运动,直至P点停止运动,Q点也停止运动.当P点开始运动后的第 秒时,P,Q两点之间的距离为2.
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【推荐2】如图,在数轴上点
表示数
,点
表示数
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590e708dfc625de361df943d0fe9c5de.png)
(1)填空,
_______________,
_______________;
(2)若点
与点
之间的距离表示为
,点
与点
之间的距离表示为
,已知点
为数轴上一动点,且满足
,求出点
表示的数;
(3)若点
以每秒
个单位长度的速度向左运动,同时点
以每秒
个单位长度的速度向右运动,动点
从原点开始以每秒
个单位长度运动,运动时间为
秒,运动过程中,点
始终在
、
两点之间上,且
的值始终是一个定值,求
点运动的方向及
的值,
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590e708dfc625de361df943d0fe9c5de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/a646ab6e-d29c-40e6-8281-8f8b56f4695e.jpg?resizew=230)
(1)填空,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277696e8d9f58c9ec28887783b317e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1dbed0813c67a81a3a76c288a3f105.png)
(2)若点
![](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/e1a9c6a736e6eac98a676fa3232db5a5.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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5dbcc64394811c66080ae551cddccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/ddaa566a7b22915f7182e3643d6c06d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】如果两个角的差的绝对值等于
,就称这两个角互为“伙伴角”,其中一个角叫做另一个角的“伙伴角”(本题所有的角都指大于
小于
的角),例如
,
,
,则
和
互为“伙伴角”,即
是
的“伙伴角”,
也是
的“伙伴角”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/90e780bd-e7d4-41bc-b36e-8bd27fc83717.png?resizew=442)
(1)如图1.O为直线
上一点,
,
,则
的“伙伴角”是_______________.
(2)如图2,O为直线
上一点,
,将
绕着点O以每秒
的速度逆时针旋转得
,同时射线
从射线
的位置出发绕点O以每秒
的速度逆时针旋转,当射线
与射线
重合时旋转同时停止,若设旋转时间为t秒,求当t何值时,
与
互为“伙伴角”.
(3)如图3,
,射线
从
的位置出发绕点O顺时针以每秒
的速度旋转,旋转时间为t秒
,射线
平分
,射线
平分
,射线
平分
.问:是否存在t的值使得
与
互为“伙伴角”?若存在,求出t值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f859af1ce9e4da521c407411ad0e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9438830129a138d84b5849acce442e1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13d64a7d643c170c225883c53089152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/90e780bd-e7d4-41bc-b36e-8bd27fc83717.png?resizew=442)
(1)如图1.O为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fad4140c2e254823a8cc89fff06dcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a285533b962ac3a1bd8dc46e9351a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
(2)如图2,O为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f2a3353bbf413a24c461bb7d8d68d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a840804ee07144f46c9c2a33e33ae450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb204f42d5fb6cd55050a18cca2804b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a02c61cb552d1173b18b42f8d160dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc16f868ab9f439f8081d6ce9a56ac7.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fda71562f4f7207ad317e6ce37a8566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf79e5246ad8e945c5c1ff1f68007b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63679c80e6bd24f3a27763d545dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a857e0044303d7d53733147ccc6194ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f773ca20bd122f053b3e7b67f048533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ec4210f08cfe005b7eaa28eb69fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f773ca20bd122f053b3e7b67f048533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d446f2e1ede1cb84fe36c8214e0de7.png)
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【推荐1】如图,在数轴上A点表示数a,B点表示数b,AB表示A点和B点之间的距离,且a、b满足
.
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845319924989952/2927574101360640/STEM/526b3fd4-8982-4f76-b174-3e16c03f8a3b.png?resizew=238)
(1)填空:a= ,b= ,AB= ;
(2)若数轴上存在一点C,且AC=2BC,求C点表示的数;
(3)若在原点O处放一挡板,一小球甲从点A处以1个单位/秒的速度向左运动,同时另一小球乙从点B处以2个单位/秒的速度也向左运动,在碰到挡板后(忽略球的大小,可看作一点)以原来的速度向相反的方向运动,设运动的时间为t(秒).
①分别表示甲、乙两小球到原点的距离(用t表示);
②求甲、乙两小球到原点的距离相等时经历的时间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd77ae39ee7d40f6c2d2ab5be6d6eeb2.png)
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845319924989952/2927574101360640/STEM/526b3fd4-8982-4f76-b174-3e16c03f8a3b.png?resizew=238)
(1)填空:a= ,b= ,AB= ;
(2)若数轴上存在一点C,且AC=2BC,求C点表示的数;
(3)若在原点O处放一挡板,一小球甲从点A处以1个单位/秒的速度向左运动,同时另一小球乙从点B处以2个单位/秒的速度也向左运动,在碰到挡板后(忽略球的大小,可看作一点)以原来的速度向相反的方向运动,设运动的时间为t(秒).
①分别表示甲、乙两小球到原点的距离(用t表示);
②求甲、乙两小球到原点的距离相等时经历的时间.
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解答题-证明题
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较难
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【推荐2】在
中,∠ACB=90°,AC=BC,直线MN经过点C,且AD⊥MN于点D,BE⊥MN于点E.
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600822664830976/2602195945570304/STEM/5e0a9cc85e8c4cf298eae74196c6e0e0.png?resizew=474)
(1)当直线MN绕着点C旋转到如图1所示的位置时,
求证:①
;
②DE=AD+BE
(2)当直线MN绕着点C旋转到如图2所示的位置时,
①找出图中一对全等三角形;
②DE、AD、BE之间有怎样的数量关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600822664830976/2602195945570304/STEM/5e0a9cc85e8c4cf298eae74196c6e0e0.png?resizew=474)
(1)当直线MN绕着点C旋转到如图1所示的位置时,
求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948a53654ac029ff812f4469c679905f.png)
②DE=AD+BE
(2)当直线MN绕着点C旋转到如图2所示的位置时,
①找出图中一对全等三角形;
②DE、AD、BE之间有怎样的数量关系,并加以证明.
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