如图①,一个Rt△DEF直角边DE落在AB上,点D与点B重合,过A点作二射线AC与斜边EF平行,已知AB=12,DE=4,DF=3,点P从A点出发,沿射线AC方向以每秒2个单位的速度运动,Q为AP中点,设运动时间为t秒(t>0)•
(1)当t=5时,连接QE,PF,判断四边形PQEF的形状;
(2)如图②,若在点P运动时,Rt△DEF同时沿着BA方向以每秒1个单位的速度运动,当D点到A点时,两个运动都停止,M为EF中点,解答下列问题:
①当D、M、Q三点在同一直线上时,求运动时间t;
②运动中,是否存在以点Q为圆心的圆与Rt△DEF两个直角边所在直线都相切?若存在,求出此时的运动时间t;若不存在,说明理由.
(1)当t=5时,连接QE,PF,判断四边形PQEF的形状;
(2)如图②,若在点P运动时,Rt△DEF同时沿着BA方向以每秒1个单位的速度运动,当D点到A点时,两个运动都停止,M为EF中点,解答下列问题:
①当D、M、Q三点在同一直线上时,求运动时间t;
②运动中,是否存在以点Q为圆心的圆与Rt△DEF两个直角边所在直线都相切?若存在,求出此时的运动时间t;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2015/8/24/1578714597408768/1578714597998592/STEM/251e71f0db2348ebb2ac1a9054ddae64.png)
2015·江苏苏州·一模 查看更多[1]
更新时间:2016-12-12 21:25:58
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名校
【推荐1】在
中,
,
,点
为
边上一动点,且
,
交
边于点
.探究:如图1,若
.
时,求
的长;
(2)当
为等腰三角形时,求
的长;
(3)延伸:如图2,若
,
为
上一点,且
.小东经过研究发现:“当点
在
边上运动时,
的长度不变,是个定值.”你认为小东的结论是否正确?如果正确,请求出这个定值;如果不正确,说明理由;
(4)若
,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983d4402fddd33c1cc85ebc1711d2c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8a6ac027fb5985958afa2fe35d3d4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)延伸:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc60f2fd9c91293a743111539202a169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6618b4d41917e695da2356c016242ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7cc5c75476896a599093f5ac10b97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
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【推荐2】如图,在矩形
中,
,
,E是
上一点,且
.动点P从点B出发,沿
方向以每秒3个单位的速度向点C运动,过点P作
交
于点F,过点F作
交
于点G,连结
.当点F与点A重合时,点P停止运动,设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897815117447168/2960710504947712/STEM/0107dbe2-6d41-4945-8225-b49215525d6b.png?resizew=176)
(1)求
的长(用含t的代数式表示);
(2)当点P在何处时,
的面积最大?最大面积是多少?
(3)作
的外接圆
,在点P的运动过程中,是否存在实数t,使
与四边形
的一边(
边除外)相切?若存在,直接写出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cfd06fbb5ceab1ec9b8385cd14a9d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4042e4acd0e823c2a69ce8bee3b995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897815117447168/2960710504947712/STEM/0107dbe2-6d41-4945-8225-b49215525d6b.png?resizew=176)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(2)当点P在何处时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a8ceee5fa19abfde9173aac721b35b.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb59ba8382f1463050d408191e131c41.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/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐3】定义:如图1,点P为
平分线上一点,
的两边分别与射线
交于M,N两点,若
绕点P旋转时始终满足
,则称
是
的“梦之角”.
,点P为
平分线上一点,
的两边分别与射线
交于M,N两点,且
.求证:
是
的“梦之角”;
(2)如图2,已知
,
,若
是
的“梦之角”,连接
,用含
的式子分别表示
的度数和
的面积;
(3)如图3,C是函数
图象上的一个动点,过点C的直线
分别交x轴和y轴于点A,B两点,且满足
,
的“梦之角”为
,请直接写出
的长及相应点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a5e484dfef494d27bc35ae7b8cf75d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4871430e6a86eb8e65ef9cfe196e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2d9e7d8cdfc0087afabd6b78992a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df8207303326aaab6a0b763e24d857c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f02028a3847c4807c2d3cf0ea7efb8.png)
(3)如图3,C是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d15ffbe24c1e1b1c57a1271dad8d1c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9cbc8be03e4b5e76338d65be175973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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【推荐1】在矩形
中,
,点P从点A出发沿
边以
的速度向点B移动,同时,点Q从点B出发沿
以
的速度向点C移动,其中一点到达终点时,另一点随之停止运动.设运动时间为t秒:
(1)如图1,几秒后,
的面积等于
?
(2)在运动过程中,若以P为圆心的
同时与直线
相切(如图2),求t值;
(3)若以Q为圆心,
为半径作
.
①在运动过程中,是否存在t值,使得点D落在
上?若存在,求出t值;若不存在,请说明理由;
②若
与四边形
有三个公共点,则t的取值范围为 .(直接写出结果,不需说理)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6171f946ab22be1144ceb27b73b15b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/d76b344b-5c91-460c-9449-527ae6dcde9f.jpg?resizew=317)
(1)如图1,几秒后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049053d5d9741aabac198a00c4733a20.png)
(2)在运动过程中,若以P为圆心的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb7c9b5376c6d491e743b710bc25701.png)
(3)若以Q为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
①在运动过程中,是否存在t值,使得点D落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cdefde4fe3f81ce29c680146d69e6e0.png)
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【推荐2】(1)问题提出:如图①,在△MBC中,∠BAC=60°,AB=5,AC=4,AD是BC边上的中线,求AD的长.
(2)问题解决:某户外拓展训练营准备在园区内建设一个平行四边形的拓展训练区,如图②,平行四边形ABCD为拓展训练区的示意图,按照设计要求,需要在区域内部设计一个“极限挑战区”,四边形EFGH为极限挑战区的示意图,其中E、F、H分别为AD、BE、CD的中点,G为CE的一个三等分点(靠近点C),AB=300米,∠BEC=60°,求“极限挑战训练区”四边形EFGH面积的最大值.
(2)问题解决:某户外拓展训练营准备在园区内建设一个平行四边形的拓展训练区,如图②,平行四边形ABCD为拓展训练区的示意图,按照设计要求,需要在区域内部设计一个“极限挑战区”,四边形EFGH为极限挑战区的示意图,其中E、F、H分别为AD、BE、CD的中点,G为CE的一个三等分点(靠近点C),AB=300米,∠BEC=60°,求“极限挑战训练区”四边形EFGH面积的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/8b308286-0ef4-4636-a084-c0a5f6d87064.png?resizew=400)
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解题方法
【推荐3】在直角坐标系中,A(0,4),B(4
,0).点C从点B出发沿BA方向以每秒2个单位的速度向点A匀速运动,同时点D从点A出发沿AO方向以每秒1个单位的速度向点O匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点C、D运动的时间是t秒(t>0).过点C作CE⊥BO于点E,连接CD、DE.
![](https://img.xkw.com/dksih/QBM/2014/5/28/1573730010357760/1573730016034816/STEM/ccf6b5ec9d65424d82cf357c1b1a8c51.png?resizew=205)
(1)当t为何值时,线段CD的长为4;
(2)当线段DE与以点O为圆心,半径为
的⊙O有两个公共交点时,求t的取值范围;
(3)当t为何值时,以C为圆心、CB为半径的⊙C与(2)中的⊙O相切?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2014/5/28/1573730010357760/1573730016034816/STEM/ccf6b5ec9d65424d82cf357c1b1a8c51.png?resizew=205)
(1)当t为何值时,线段CD的长为4;
(2)当线段DE与以点O为圆心,半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(3)当t为何值时,以C为圆心、CB为半径的⊙C与(2)中的⊙O相切?
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