在Rt△ABC中,AC=BC=5,∠C=90°,D是AC边上一点,
,直线DE交BC于点E.
(1)如图1,若DE∥AB, CD=_______,EB=____;
(2)如图2,在(1)的条件下,等腰Rt△CMN的端点M在直线DE上运动,连接EN,请判断DM与NE的关系,并说明理由;
(3)如图3,若∠CDE=60°,等腰Rt△CMN的端点M点在直线DE上运动,连接NB,请直接写出NB的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a285c3a2431592df56fe108489603a0b.png)
(1)如图1,若DE∥AB, CD=_______,EB=____;
(2)如图2,在(1)的条件下,等腰Rt△CMN的端点M在直线DE上运动,连接EN,请判断DM与NE的关系,并说明理由;
(3)如图3,若∠CDE=60°,等腰Rt△CMN的端点M点在直线DE上运动,连接NB,请直接写出NB的最小值.
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733518581194752/2737125290508288/STEM/fa7439462afa4cdaab54186768cd1431.png?resizew=554)
2021·山东济南·三模 查看更多[3]
2021年山东省济南市历下区中考第三次模拟考试数学试题(已下线)卷1-备战2022年中考数学【名校地市好题必刷】全真模拟卷(山东济南专用)·第一辑山东省德州市宁津县育新中学2021-2022学年九年级下学期4月月考数学试题
更新时间:2021-06-06 13:18:34
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相似题推荐
解答题-问答题
|
较难
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名校
【推荐1】如图:在中,
,
,
,动点
从
出发沿射线
以
的速度运动,设运动时间为
秒.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c826d790b1efb02bbd2acfc3b26e8e.png)
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【推荐2】如图,△ABC中,∠ABC=90°,AB=6,BC=8,AD平分∠BAC,交BC于点D.动点Q从点B出发,按BC—CA的折线路径,以每秒1个单位长度的速度运动,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/0cc83df4-3d88-441b-945a-0462e17d1a97.png?resizew=458)
(1)当点Q在AC边上运动时,线段AQ长为 (用含t的代数式表示)
(2)当点Q在AC边上运动时,线段BQ长度不可能是 .(填序号即可)
①7.2 ②5.3 ③4.8 ④4.5
(3)求△ADC的面积.
(4)当△ABQ为轴对称图形时,请直接写出t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/0cc83df4-3d88-441b-945a-0462e17d1a97.png?resizew=458)
(1)当点Q在AC边上运动时,线段AQ长为 (用含t的代数式表示)
(2)当点Q在AC边上运动时,线段BQ长度不可能是 .(填序号即可)
①7.2 ②5.3 ③4.8 ④4.5
(3)求△ADC的面积.
(4)当△ABQ为轴对称图形时,请直接写出t的值.
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解答题-作图题
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【推荐3】如图1:在
中,
,(要求:点
在
上,点
在
上;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)直角坐标系的建立,在代数和几何之间架起了一座桥梁,用代数的方法解决几何问题:某数学小组在自主学习时了解了三角形的中位线及相关的定理,在学习了相关知识后,该小组同学深入思考,利用中点坐标公式,给出了三角形中位线定理的另外一种证明方法.该数学小组建立如图2所示的直角坐标系,已知点
,
分别是
,
边的中点,不妨设点
,点
,
.请你利用该数学学习小组的思路证明
且
.(提示:中点坐标公式,
,
,
,
,则
,
中点坐标为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bf335d98f98e40e3d300487f1396ef.png)
(3)如图3:在
中,
,
,
,延长
至点
,
,连接
并延长
边于点
,若
,则
是否存在最小值,若存在求出最小值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)直角坐标系的建立,在代数和几何之间架起了一座桥梁,用代数的方法解决几何问题:某数学小组在自主学习时了解了三角形的中位线及相关的定理,在学习了相关知识后,该小组同学深入思考,利用中点坐标公式,给出了三角形中位线定理的另外一种证明方法.该数学小组建立如图2所示的直角坐标系,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7903097d9663549d86e6267da59537a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c6df9a988e7dd779f1e8557bae298b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479985bb72d69f9a421ae9af76ed651c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a54e0b4872cabdc0b07ea9380e4de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a350eb41c3b7e4face9c3299eff9d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8e72f73db207c3040f143d837d5995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24529eadaef974ec0625f8ca40682e51.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/c32a8ce836efaa851353436342ae1f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bf335d98f98e40e3d300487f1396ef.png)
(3)如图3:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8225b3e02f5a9f1fd5a09ada650cb78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ff4468bd547f79536e626432c6c113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
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【推荐1】如图1,P是线段AB上的一点,在AB的同侧作△APC和△BPD,使PC=PA,PD=PB,∠APC=∠BPD,连接CD,点E、F、G、H分别是AC、AB、BD、CD的中点,顺次连接E、F、G、H.
(1)猜想四边形EFGH的形状,直接回答,不必说明理由;
(2)当点P在线段AB的上方时,如图2,在△APB的外部作△APC和△BPD,其他条件不变,(1)中的结论还成立吗?说明理由;
(3)如果(2)中,∠APC=∠BPD=90°,其他条件不变,先补全图3,再判断四边形EFGH的形状,并说明理由.
(1)猜想四边形EFGH的形状,直接回答,不必说明理由;
(2)当点P在线段AB的上方时,如图2,在△APB的外部作△APC和△BPD,其他条件不变,(1)中的结论还成立吗?说明理由;
(3)如果(2)中,∠APC=∠BPD=90°,其他条件不变,先补全图3,再判断四边形EFGH的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2017/4/27/1674670070751232/1679789738229760/STEM/5f0d9cc3-f281-4176-bab8-92da1f999b1f.png?resizew=598)
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解答题-证明题
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【推荐2】在
中,
, 点P在线段
上,
,
交
于点D,过点B作
,垂足为E,交
的延长线于点F.
,
①如图1当点P与点C重合时,求证:
;
②如图
,当点
在线段
上,且不与点
、点
重合时,问: ①中的“
”仍成立吗?请说明你的理由;
(2)如果
,如图11,已知
(n为常数),当点P在线段
上,
且不与点B、点C重合时,请探究
的值(用含n的式子表示),并写出你的探究过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93572e4ae3065931d938a9de3e5cda44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03d3b1a7b201f380f960db4b6ff2943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
①如图1当点P与点C重合时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f935a74588bfbbb7f73323ba3e19a0c.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f935a74588bfbbb7f73323ba3e19a0c.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ee042fe1ab4e7b97b9b9b935e367a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71aab3a6bb6826437abf0d6e90e24d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfeb1696290ff2810cca701bd6f02c2f.png)
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解答题-证明题
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【推荐1】我们定义:三角形中,如果有一个角是另一个角的2倍,那么称这个三角形是2倍角三角形.
(1)定义应用:如果一个等腰三角形是2倍角三角形,则其底角的度数为___________;
(2)性质探索:小思同学通过对2倍角三角形的研究,发现:
在
中,如果
,那么
.
下面是小思同学的证明方法:
已知:如图1,在
中,
,
.
.
证明:如图1,延长
到
,使得
,连接
.
∴
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac4db9fffb6ea103cf3f0c2d053eee3.png)
∵
,
∴
,
∵
,∴
,
又
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9900f1590af4a315bb7537e18a0a7b8e.png)
∴
∴
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139f831fd386290c5f893f654a2f9a48.png)
根据上述材料提供的信息,请你完成下列情形的证明:
已知:如图2,在
中,
.
.
(3)性质应用
已知:如图3,在
中,
,
,
,则
___________;
已知:如图4,在
中,
,
,
,求
的长.
(1)定义应用:如果一个等腰三角形是2倍角三角形,则其底角的度数为___________;
(2)性质探索:小思同学通过对2倍角三角形的研究,发现:
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23144e094f263242c8c8f9c78e88f88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139f831fd386290c5f893f654a2f9a48.png)
下面是小思同学的证明方法:
已知:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139f831fd386290c5f893f654a2f9a48.png)
证明:如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e49ed40c235ceab2be97db0629b042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac4db9fffb6ea103cf3f0c2d053eee3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7cc7975897e07676f8b71a4f29188e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4a288554fe25fe0a72530eb29756e1.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9067ce1317d0dc6bfeb2e4683ee7e9f9.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578fba8c50c4b1d275316c1a0688761c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9900f1590af4a315bb7537e18a0a7b8e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39442752474d1b70bdcca6e694afdfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5597dd19cd07d06ec56f5669f862aaff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139f831fd386290c5f893f654a2f9a48.png)
根据上述材料提供的信息,请你完成下列情形的证明:
已知:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a4d634d3d678a1912a827fade6a0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139f831fd386290c5f893f654a2f9a48.png)
(3)性质应用
已知:如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9af7ab732d431dd78e84db9586d3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
已知:如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cac09ed24d7f8a47b746fa6b12cd33c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,在正方形
中,E是边
上的一动点(不与B重合),连接
,点A关于直线
的对称点为F,连接
并延长交
于G,连
,过点E作
交
的延长线于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/ae28a2d3-c307-4499-9040-ec30dbc191b7.png?resizew=168)
(1)求证:
;
(2)当点E在边
上(不与B重合)运动时,
的大小是否变化?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4513abf37136037664caca6cbece72a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/ae28a2d3-c307-4499-9040-ec30dbc191b7.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a96a9710d1b655b06a9898b5a09a14.png)
(2)当点E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cbd0aed61f9f50d4825cc0eccd5754c.png)
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解答题-问答题
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较难
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【推荐1】已知:如图,菱形ABCD中,对角线AC,BD相交于点O,且AC=6cm,BD=8cm.点P从点B出发,沿BA方向匀速运动,速度为1cm/s;同时,直线EF从点D出发,沿DB方向匀速运动,速度为1cm/s,EF⊥BD,且与AD,BD,CD分别交于点E,Q,F.当直线EF停止运动,点P也停止运动.连接PF,设运动时间为t(s).解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/f9294b14-f497-4def-8f16-c40d9ed6a2b6.png?resizew=203)
(1)用含t的代数式表示线段EF: ;
(2)当t为何值时,四边形ADFP是平行四边形;
(3)设四边形APFE的面积为y(cm2),求y与t之间的函数关系式;
(4)是否存在某一时刻t,使得PF与EF的夹角为45°?若存在,求出t的值,若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/f9294b14-f497-4def-8f16-c40d9ed6a2b6.png?resizew=203)
(1)用含t的代数式表示线段EF: ;
(2)当t为何值时,四边形ADFP是平行四边形;
(3)设四边形APFE的面积为y(cm2),求y与t之间的函数关系式;
(4)是否存在某一时刻t,使得PF与EF的夹角为45°?若存在,求出t的值,若不存在,说明理由.
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解答题-问答题
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较难
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【推荐2】如图,抛物线y=
x2﹣
x﹣
与x轴交于点A和点B,与y轴交于点C,经过点C的直线l与抛物线交于另一点E(4,a),抛物线的顶点为点Q,抛物线的对称轴与x轴交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/00763541-151b-4c24-b0cf-37fbd9b0b4cd.png?resizew=550)
(1)求直线CE的解析式.
(2)如图2,P为直线CE下方抛物线上一动点,直线CE与x轴交于点F,连接PF,PC.当△PCF的面积最大时,求点P的坐标及△PCF面积的最大值.
(3)如图3,连接CD,将(1)中抛物线沿射线CD平移得到新抛物线y′,y′经过点D,y′的顶点为点H,在直线QH上是否存在点G,使得△DQG为等腰三角形?若存在,求出点G的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/00763541-151b-4c24-b0cf-37fbd9b0b4cd.png?resizew=550)
(1)求直线CE的解析式.
(2)如图2,P为直线CE下方抛物线上一动点,直线CE与x轴交于点F,连接PF,PC.当△PCF的面积最大时,求点P的坐标及△PCF面积的最大值.
(3)如图3,连接CD,将(1)中抛物线沿射线CD平移得到新抛物线y′,y′经过点D,y′的顶点为点H,在直线QH上是否存在点G,使得△DQG为等腰三角形?若存在,求出点G的坐标.
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