如图,已知
和
都是等腰三角形,
.连接
交
于点
,连接
交
于点
,
与
交点为
,连接
.
(1)如图1,求证:
;
(2)如图1,求证:
;
(3)如图1,求证:
是
的平分线;
(4)如图2,当
,
时,
_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8342d703cb648c57a1acdec5ccaa35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417896920268800/2417968653434880/STEM/1d542cfaadc348b3a28841b0abf2549f.png?resizew=447)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda2b7d37641a3f3365b33b380a40a96.png)
(2)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
(3)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f9f8b429cc830b6c9c4ade5d4db25c.png)
(4)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c85051c563c1fbaa06b4e8940e7113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
19-20八年级上·浙江·期末 查看更多[1]
(已下线)【新东方】初中数学721【2019年】【初二上】
更新时间:2020-03-12 15:12:43
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】已知在
和
中,
,
,
,
,
相交于点
,连接
.
(1)求证:
;
(2)求证:
;
(3)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a608fe3ad751ed330e27bfac7800a288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212125c9527ce3c18db6ca7d05902d23.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8290323a3da9d76a509ba5d14daabe97.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
![](https://img.xkw.com/dksih/QBM/2021/2/25/2665791810478080/2672889993871360/STEM/a1bd63a2-2f88-49fa-90b6-fce815c4d14d.png?resizew=261)
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【推荐2】通过对下面数学模型的研究学习,解决下列问题:
(1)【模型呈现】如图,AD为
的中线,
交AD的延长线于点E,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/5b8eccde-5e40-4469-9a2b-d051a3570550.png?resizew=208)
(2)【模型应用】如图,在四边形ABCD中,
,E是BC中点,连接AE,DE,AE平分
,求证:DE平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/b7402e53-d145-40a0-a2d3-a940409b7297.png?resizew=186)
(3)【拓展探索】如图,在
中,
,
于点D,过点B作
交
的平分线于点E,过点E作
交BC于点F,若
,求证:
.
(1)【模型呈现】如图,AD为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5d737d39e5ea753c6c824dd964751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/5b8eccde-5e40-4469-9a2b-d051a3570550.png?resizew=208)
(2)【模型应用】如图,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/b7402e53-d145-40a0-a2d3-a940409b7297.png?resizew=186)
(3)【拓展探索】如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef4880035ecfa3c71064e5988e3820e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466ad4315b016b483cd1112a8757d6ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/3302c92c-d107-47a4-ba07-e6605794d2e3.png?resizew=272)
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解答题-问答题
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【推荐1】如图1,
中,
,BD平分
,
于点B.动点P从点D出发沿线段DB以每秒2个单位的速度向点B运动,同时动点Q从点B出发沿射线BE以每秒4个单位的速度运动,运动时间为t秒,当点P到达点B时,P、Q同时停止运动.
;
(2)若
是直角三角形,求t的值.
(3)若
,则t的值为______(直接写出答案,不要求书写求解过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ae8ac550c5d72e46529949667a2190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692be2bd41b2fecc7c60723d1bda976f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e450abeb97e7848ef35fcee286b27e.png)
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【推荐2】如图,在
ABCD中,分别以AB,CD为底边在▱ABCD内侧作等腰△ABF和等腰△DCE,且∠AFB=∠DEC=120°,连接CF和AE并延长,分别交边AB,CD于点M和点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/3996b6a5-9fe4-421f-a252-4b07462f787b.png?resizew=178)
(1)求证:∠ADE=∠CBF;
(2)求证:四边形AMCN为平行四边形;
(3)连接MN,若MN∥BC,AB=
BC,
ABCD的面积为3,求CF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/3996b6a5-9fe4-421f-a252-4b07462f787b.png?resizew=178)
(1)求证:∠ADE=∠CBF;
(2)求证:四边形AMCN为平行四边形;
(3)连接MN,若MN∥BC,AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
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【推荐1】如图1,在平面直角坐标系中,一次函数
的图象交x轴于点A,交y轴于点B.点D在x轴正半轴上,且
,以
、
为边作平行四边形
.
(1)点A的坐标______,点B的坐标______;
(2)请求出直线
的函数解析式;
(3)如图2,点E从点O出发,以每秒1个单位的速度沿x轴正方向移动,记点E运动时间为t秒.点F是线段
的中点,连接EF并延长交直线
于点H,请直接写出:当t为何值时,四边形
为平行四边形;
(4)点Q是直线
上的一个动点,在y轴上找一点P,连接
,
,
,当
是以
为斜边的等腰直角三角形时,请直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e488bcf5c0eacfb5cb27a70038d4f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8238c1764e48d6de755305336ad61fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/26/07d6ec89-2f90-47ff-a566-089aa2261d82.png?resizew=432)
(1)点A的坐标______,点B的坐标______;
(2)请求出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图2,点E从点O出发,以每秒1个单位的速度沿x轴正方向移动,记点E运动时间为t秒.点F是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20f5298aff67dbf8441c082ae7932a6.png)
(4)点Q是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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【推荐2】如图1,
、
在直线l的同侧,
在
的左边,
,
,
,连接
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/07b416e5-4b0e-4112-aeff-a8ed10584209.png?resizew=419)
(1)
是 三角形:
(2)如图2,以
为一边向外作等边
,当边
与
重合时,直接写出
与
的数量关系 ;
(3)如图3,当等边
的边
,且
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae781496bb5bc79b67abced9aa3cd0c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87320eb4a1c31ad4ffc15ccb2855a6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/07b416e5-4b0e-4112-aeff-a8ed10584209.png?resizew=419)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)如图3,当等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684d328b02462aa25a936d1c83eee4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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