如图,在
中,
,
,
,点P从点B出发沿着边
以
的速度匀速向终点A运动;同时点Q从点C出发沿着边
以
的速度匀速向终点B运动,运动时间为t秒
,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6667e11b-9e8b-4c4b-aa37-85b23b04685b.png?resizew=146)
(1)
______
.
(2)当
与
相似时,求t的值.
(3)点M为
的中点,在点P与点Q运动的过程中,直接写出点M运动的路径长.
(4)以线段
和线段
为邻边,构造平行四边形
,连结
.直接写出直线
与
的边垂直时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb73f3d840fcda9bf55aef0aa147e21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3c2d90ab6cea17fc95433e3644ee3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0deac44991b2d068632ca89a3448c2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6667e11b-9e8b-4c4b-aa37-85b23b04685b.png?resizew=146)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
(3)点M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(4)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee839b2aeb11e2ac709d78cd213db47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
更新时间:2024-01-03 19:46:49
|
相似题推荐
解答题-证明题
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较难
(0.4)
【推荐1】如图,△ABC是等边三角形,在BC的上方作△DBC,使BC=DC,∠BCD=
,直线BD与直线AC相交于点F,点E在直线BD上,且∠AED=120°,连接CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/afaca67c-ce49-4a69-9c9f-bd8809c3f588.png?resizew=356)
(1)如图1,若60°<
<180°,
①请直接写出∠EAC与∠DBC的数量关系;
②猜想线段BD,AE,CE之间的数量关系,并证明你的猜想;
(2)若0°<
<60°时,在图2中画出图形,(2)中的结论是否成立,如果成立,请说明理由,如果不成立,请直接写出你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/afaca67c-ce49-4a69-9c9f-bd8809c3f588.png?resizew=356)
(1)如图1,若60°<
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
①请直接写出∠EAC与∠DBC的数量关系;
②猜想线段BD,AE,CE之间的数量关系,并证明你的猜想;
(2)若0°<
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】已知平面内有一个△ABC,O为平面内的一点,延长AO到A′,使OA′=OA,延长BO到B′,使OB′=OB,延长CO到从C′,使OC′=OC,得到△A′B′C′,问:△A′B′C′与△ABC是否全等?这两个三角形的对应边是否平行?请说明理由.
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解题方法
【推荐1】【操作发现】
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753660790931456/2759152591110144/STEM/ee7bf2f1-0d93-4c94-8e1f-42c505cfc101.png)
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753660790931456/2759152591110144/STEM/5b04763b-1988-4883-899b-21ea37d95edb.png)
(1)如图1,在边长为1个单位长度的小正方形组成的网格中,
的三个顶点均在格点上.
①请按要求画图:将
绕点
按顺时针方向旋转90°,点
的对应点为
,点
的对应点为
;
②连接
,此时
______°;
【问题解决】
在某次数学兴趣小组活动中,小明同学遇到了如下问题:
(2)如图2,在等边
中,点
在内部,且
,
,
,求
的长.
经过同学们的观察、分析、思考、交流,对上述问题形成了如下想法:将
绕点
按顺时针方向旋转60°,得到
,连接
,寻找
、
、
三边之间的数量关系.…请参考他们的想法,完成该问题的解答过程;
【学以致用】
(3)如图3,在等腰直角
中,
,
为
内一点,且
,
,
,求
;
【思维拓展】
(4)注意:从以下①②中,你任意选择一道题解答即可.
①等腰直角
中,
,
为
内部一点,若
,则
的最小值=______
②如图4,若点
是正方形
外一点,
,
,
,求
的度数.
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753660790931456/2759152591110144/STEM/ee7bf2f1-0d93-4c94-8e1f-42c505cfc101.png)
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753660790931456/2759152591110144/STEM/5b04763b-1988-4883-899b-21ea37d95edb.png)
(1)如图1,在边长为1个单位长度的小正方形组成的网格中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①请按要求画图:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c578d3a17de6f47abaaeca5ab778e7f.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e435d643780ed87871dcc27fadda45.png)
【问题解决】
在某次数学兴趣小组活动中,小明同学遇到了如下问题:
(2)如图2,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61fb3b92bd08707aca2f3e31ae16a68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
经过同学们的观察、分析、思考、交流,对上述问题形成了如下想法:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f8c0c8a16d9e56d7db6a9d8657faf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
【学以致用】
(3)如图3,在等腰直角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3015db5ca1f49bb7bad43657e06863ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ced8225ff27c8e3e1897b8629312d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942a9a6bde4a5b9803b68b1e9065de62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
【思维拓展】
(4)注意:从以下①②中,你任意选择一道题解答即可.
①等腰直角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643bd6c1545b531e70f05913dc28bda0.png)
②如图4,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04260d53a143dac4b4f7a8528e1a7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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名校
【推荐2】如图1,
是
的弦,点C在
外,连接
、
分别交
于D、E,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/4e085032-ba63-47e5-afc4-839cb566e117.png?resizew=434)
(1)求证:
.
(2)如图2,过圆心O作
,交
于P、Q两点,交
、
于M、N两点,求证:
.
(3)如图3,在(2)的条件下,连接
、
,
,若
,
,求弦
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/4e085032-ba63-47e5-afc4-839cb566e117.png?resizew=434)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
(2)如图2,过圆心O作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4635b3ba280ea836f37948e70f039103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa60af8a0b0a4c748e50f8b677677183.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3538707d97cc76ddd6d58694bbdfa48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad73d7804e6feb8cc9132ce8fc2ef801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34974b6e998d92975aa8f78716925be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】如图1,在
中,
于点
,点
是
中点,将
绕点
旋转
得到
.
(1)试判断四边形
的形状,并说明理由.
(2)如图2,将
绕点
顺时针旋转得到
,当旋转到如图2位置时,直线
刚好经过点
且与
交于点
,求此时
的长.
(3)如图3,将
绕点
逆时针旋转得到
.当
和
重合时,连接
交
于点
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f82bc183d65701b7c6b4a928c949364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
(1)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041e4132c761a05c17d9d54ae3e41151.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed498ae755406d043b909bed12b33295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cd453f2041802c58d7b2ab5226981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed498ae755406d043b909bed12b33295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db94ea06ef27a92107d4bb70a404a826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c962456e190ea0d7e6e88782aa8c161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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【推荐2】在Rt△ABC中,∠C=90°,AB=10,AC=8,点Q在AB上,且AQ=2,过Q作QR⊥AB,垂足为Q,QR交折线AC﹣CB于R(如图1),当点Q以每秒2个单位向终点B移动时,点P同时从A出发,以每秒6个单位的速度沿AB﹣BC﹣CA移动,设移动时间为t秒(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/652efa17-1fd2-4e80-bd46-17a4acbba5e8.png?resizew=390)
(1)求△BCQ的面积S与t的函数关系式.
(2)t为何值时,QP∥AC?
(3)t为何值时,直线QR经过点P?
(4)当点P在AB上运动时,以PQ为边在AB上方所作的正方形PQMN在Rt△ABC内部,求此时t的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/652efa17-1fd2-4e80-bd46-17a4acbba5e8.png?resizew=390)
(1)求△BCQ的面积S与t的函数关系式.
(2)t为何值时,QP∥AC?
(3)t为何值时,直线QR经过点P?
(4)当点P在AB上运动时,以PQ为边在AB上方所作的正方形PQMN在Rt△ABC内部,求此时t的取值范围.
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【推荐3】如图,在平面直角坐标系中,△ABC的顶点A在x轴的负半轴上,顶点B在y轴的负半轴上,边AC交y轴的正半轴于点E,抛物线y=ax2+bx﹣4经过点B,且与直线AB只有一个公共点,点D是抛物线与x轴正半轴的交点.已知∠BAC=90°,AB=AC,点A的坐标为(﹣2,0),点D的坐标为(3,0).
(1)求此抛物线的表达式;
(2)若P是抛物线上的一点,使得锐角∠PBE<∠ABE,求点P的横坐标xp的取值范围;
(3)将△ABC沿BC所在直线进行翻折,使点A落在点F处,过点F作x轴的垂线,交直线AC于点M,将抛物线沿其对称轴向下平移,使抛物线与线段AM总有两个公共点,则抛物线向下最多可平移多少个单位长度?
(1)求此抛物线的表达式;
(2)若P是抛物线上的一点,使得锐角∠PBE<∠ABE,求点P的横坐标xp的取值范围;
(3)将△ABC沿BC所在直线进行翻折,使点A落在点F处,过点F作x轴的垂线,交直线AC于点M,将抛物线沿其对称轴向下平移,使抛物线与线段AM总有两个公共点,则抛物线向下最多可平移多少个单位长度?
![](https://img.xkw.com/dksih/QBM/2019/5/18/2206156863954944/2208928679084032/STEM/b6d2cc3c99044dbab0a9818516599242.png?resizew=358)
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【推荐1】如图,在等腰三角形
中,
,以
为直径的
分别交
、
于点
、
,过点
作
的切线交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/d7a0a0d9-d210-44b6-b508-94800e366d22.png?resizew=177)
(1)求证:
;
(2)若
的半径为5,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/d7a0a0d9-d210-44b6-b508-94800e366d22.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fa33dec909525be287ce390f0f383a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee29647772d5d62e1562e6525e125bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b280088a8f97b52c2145bc709434e7a.png)
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【推荐2】如图,已知Rt△ABC的直角边AC与Rt△DEF的直角边DF在同一条直线上,且AC=60cm,BC=45cm,DF=6cm,EF=8cm.现将点C与点F重合,再以4cm/s的速度沿CA方向移动△DEF;同时,点P从点A出发,以5cm/s的速度沿AB方向移动.设移动时间为t(s),以点P为圆心,3t(cm)长为半径的⊙P与直线AB相交于点M,N,当点F与点A重合时,△DEF与点P同时停止移动,在移动过程中:
(1)连接ME,当ME∥AC时,t= s;
(2)连接NF,当NF平分DE时,求t的值;
(3)是否存在⊙P与Rt△DEF的两条直角边所在的直线同时相切的时刻?若存在,求出t的值;若不存在,说明理由.
(1)连接ME,当ME∥AC时,t= s;
(2)连接NF,当NF平分DE时,求t的值;
(3)是否存在⊙P与Rt△DEF的两条直角边所在的直线同时相切的时刻?若存在,求出t的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/d0167471-305a-468c-bbe7-3d48b7430b8c.png?resizew=196)
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较难
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【推荐3】在平面直角坐标系
中,已知点
.对于点
,
给出如下定义:
若点
关于直线
的对称点为点
,点
关于直线
的对称点为点
,则称点
是点
关于点
的“二称点”.
,点
,点
是点
关于点
的“二称点”,
①如图1,当
时,点
的坐标为__________;
②连接
,若
所在直线平行于坐标轴时,直接写出此时
的长度;
(2)已知点
在直线
上,如图
,直线
与
轴,
轴分别交于点
,
,对于线段
上(包括端点)任意一点
,若以
为半径的
上总存在一点
,使得点
关于点
的“二称点”在x轴的正半轴上,直接写出符合条件的
的值.(已知
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d5b7b31b33ca246329a82a46f478a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c798e875178be794916036c315db410e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d605eb72a409be906b6c9cc1323a3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30ee8b98bd071f65863897db9cbacb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb8ff4c8e7177494a235923e35721cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226c537fb62c20cd82af6170b7829133.png)
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