如图,在平面直角坐标系
中,抛物线
与
轴交于
,
两点(
在
的右侧),与
轴交于点
,已知
,
,连接
.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893673746481152/2920960924540928/STEM/d3b19fce-202b-4432-b6a0-a76e172d85c8.png?resizew=361)
(1)求抛物线的解析式;
(2)如图1,点
为
下方抛物线上一动点,连接
、
,当
时,求点
的坐标;
(3)如图2,点
为线段
上一点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c629cbd8eb6d540f0850889c8482e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893673746481152/2920960924540928/STEM/d3b19fce-202b-4432-b6a0-a76e172d85c8.png?resizew=361)
(1)求抛物线的解析式;
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc811e8351f1c5f85ef914358616e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3b767ea94d796ae906d4a9578b433d.png)
更新时间:2022-02-21 06:53:07
|
相似题推荐
解答题-问答题
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较难
(0.4)
真题
名校
【推荐1】如图1,已知二次函数
的图象与x轴交于点
、
,与y轴交于点C,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/a26f542f-be5e-4c1d-90c1-f30f4d84fd81.png?resizew=548)
(1)求二次函数的解析式;
(2)如图2,过点C作
轴交二次函数图象于点D,P是二次函数图象上异于点D的一个动点,连接PB、PC,若
,求点P的坐标;
(3)如图3,若点P是二次函数图象上位于BC下方的一个动点,连接OP交BC于点Q.设点P的横坐标为t,试用含t的代数式表示
的值,并求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff17ae0e3c65eb7fac8f1775c3f20b91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/a26f542f-be5e-4c1d-90c1-f30f4d84fd81.png?resizew=548)
(1)求二次函数的解析式;
(2)如图2,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db365bec556a5d4386648db1e07a29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef11aad7660b0a54882eee45db6552a7.png)
(3)如图3,若点P是二次函数图象上位于BC下方的一个动点,连接OP交BC于点Q.设点P的横坐标为t,试用含t的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7945f52511981402a8e648fb1b38796d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7945f52511981402a8e648fb1b38796d.png)
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【推荐2】如图,在平面直角坐标系中,矩形
的三个顶点
,
,
,抛物线
经过
,
两点.动点
从点
出发,沿线段
向终点
运动,同时点
从点
出发,沿线段
向终点
运动,运动速度均为每秒1个单位长度,运动时间为
秒,过点
作
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/e11ba804-9503-41c7-9e25-66de95e1d50a.png?resizew=173)
(1)求点A的坐标及抛物线的函数表达式;
(2)过点E作
于点F,交抛物线于点G,当t为何值时,线段
的长有最大值?最大值是多少?
(3)连接
,是否存在
的值使
为等腰三角形?若存在,请求出
值;若不存在,请说明理由.(参考公式:平面内两点
、
间的距离
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7291b3d921f595f28960abcdce6dfbed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fc5a8883324330ec5e459bb0ec489e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8805e6bc6bf5e53d4eacf89a9e56833d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53be61cd85ec86aabd164cae0265246b.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/e11ba804-9503-41c7-9e25-66de95e1d50a.png?resizew=173)
(1)求点A的坐标及抛物线的函数表达式;
(2)过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8da6e6930cccd3dadf6241b92d27bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e8221447d40cf554d2a87bac6caece.png)
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解题方法
【推荐1】如图,在平面直角坐标系中,已知点A(1,3),B(2,0),点C为x轴上点B右侧的动点,以AC为腰作等腰△ACD,使AD=AC,∠CAD=∠OAB,直线DB交y轴于点P.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2619092652187648/2619634386534400/STEM/ec58d055ae8c49a0b95ec30e6dfb05e5.png?resizew=289)
(1)求证:AO=AB;
(2)求证:△AOC≌△ABD;
(3)当点C运动时,点P在y轴上的位置是否发生变化,为什么?
![](https://img.xkw.com/dksih/QBM/2020/12/21/2619092652187648/2619634386534400/STEM/ec58d055ae8c49a0b95ec30e6dfb05e5.png?resizew=289)
(1)求证:AO=AB;
(2)求证:△AOC≌△ABD;
(3)当点C运动时,点P在y轴上的位置是否发生变化,为什么?
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【推荐2】(1)如图1,△ABC中,
,
是
的中线,且
,求
的取值范围;
(2)如图2,
和
是两个全等的三角形,
,且
,将
绕点C顺时针旋转
,如图3,点A的对应点是E,点B的对应点为F,取
的中点M,连接
,求证:
;
(3)在(2)的条件下,当
时,则
______(直接填结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681a4c0e1bba3332b0dde5ce55d30e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59281d3136f2c67c078d98842171224d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b641c734c0c23261e1b3a18c39fa5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1571c3b8485cf475118d340cdac2aa65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ac25f293bd331a3a0a8c72e9e79817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3bcf92cdcb0b7159cc8c9ded2f0101.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061da3a8d2429e9f2459418b7e6acdfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/e72c1b87-6776-4715-b8f3-1416a979b8a9.png?resizew=589)
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【推荐1】综合实践课上,老师让同学们准备矩形纸片
,开展数学活动.
(1)折一折、画一画:
操作一:对折矩形纸片
,使
与
重合,得到折痕
,把纸片展平;
上一点,沿
折叠,使点A落在
上的点M处,连接
并延长交
于点Q.由上述操作后探究可得:
______°,
的形状是______三角形.
(2)剪一剪,移一移:
操作三:把纸片展平,沿
剪开;
操作四:如图2,将
沿
方向平移得到
,若
交
于点G,
交
于点H.连接
,若
,平移距离为x.
①当
为直角三角形时,求出x的值;
②设四边形
的面积为y,请直接写出y与x的函数关系式,并指出当x为何值时,y取最大值,y的最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(1)折一折、画一画:
操作一:对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5961764f4c33ea249a94a3a03818549d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
(2)剪一剪,移一移:
操作三:把纸片展平,沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
操作四:如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228cb96663132b38bbc659f5ce96f2e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2a174dbe7bb8c61f444d52e2a0620e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddad21a6de8f54e65123d274c0098c8.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d7e63df0d190a86c1cd46e4765ab3f.png)
②设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b16e54316d1c951edd48808d4442987.png)
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【推荐2】如图,矩形
的两条边
的长是方程
的两根
沿直线
将矩形折叠,点
落在第一象限的点
处,
交
轴于点
.
(1)求点
和点
的坐标;
(2)将直线
以每秒
个单位长度的速度沿
轴向下平移,求直线
扫过的三角形
的面积
关于运动的时间
的函数关系式;
(3)在(2)的条件下,在移动的直线
上是否存在点
,使以为
顶点的四边形是平行四边形?若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b60076ad90f01480cc1b28fc84b1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b99f89b30670d2ecb57a495a4af408f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/cdd76664-d75f-43fe-a8b5-be2f1df00453.png?resizew=175)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f1835adc2bb75785b02807e4fa6a6a.png)
(3)在(2)的条件下,在移动的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04730fa315447dabb40ce5279c8c3fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解答题-问答题
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较难
(0.4)
名校
【推荐1】如图,已知抛物线
与x轴交于A、B两点(点A在点B的左侧),与y轴的正半轴交于点C,点A的坐标为
,连接
.
(1)当
时,求抛物线的顶点坐标;
(2)若
,
①求m的值;
②点P是x轴上方的抛物线上的一动点,连结
.设
的面积为S.若S为正偶数,试求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd50e95a1f63ed63c5f412a5c4f2ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/e537aeb7-04b4-4571-95ac-69cd36567c3e.png?resizew=158)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
①求m的值;
②点P是x轴上方的抛物线上的一动点,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51518a5c12e549c05943e1da5387f8c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
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【推荐2】如图1,抛物线
与
轴交于
,与
轴交于点
.
(2)若点
为抛物线第一象限内动点,求四边形
的面积的最大值;
(3)如图2,点
从点
出发,沿
的方向以每秒1个单位长度的速度向终点
运动,同时点
从
出发,以每秒1个单位长度的速度沿
的方向向终点
运动,当其中一个点到达终点时,另一点也随之停止运动,设运动时间为
秒.当
是直角三角形时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c32afefeeabbf4f967f61d90d40007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2337f3f2678b04fed029b15ec53cfad9.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/e45587b6fbf112623de9715a088a6a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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