如图,菱形ABCD的边长为2,BD=2,E、F分别是边AD,CD上的两个动点,且满足AE+CF=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/cee83aff-4851-4eb3-acf2-76093ceabee0.png?resizew=176)
(1)求证:△BDE≌△BCF;
(2)判断△BEF的形状,并说明理由;
(3)设△BEF的面积为S,求S的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/cee83aff-4851-4eb3-acf2-76093ceabee0.png?resizew=176)
(1)求证:△BDE≌△BCF;
(2)判断△BEF的形状,并说明理由;
(3)设△BEF的面积为S,求S的取值范围.
更新时间:2022-08-14 11:35:44
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【推荐1】如图,在Rt
中,
平分
交
于点
为
上一点,经过点
的
分别交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/5f6dc370-6dbc-4580-a2dc-6fbb6c4796ce.png?resizew=153)
(1)求证:
是
的切线;
(2)若
,求
的半径;
(3)求证:
.
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(2)若
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(3)求证:
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【推荐2】如图所示,已知
两点的坐标分别为
和
,动点
从点
开始,在线段
上以每秒3个长度单位的速度向原点
运动,动直线
从
轴开始,以每秒1个长度单位的速度向上移动(即
轴),且分别与
轴、线段
交于点
,连接
,设动点
与动直线
同时出发,运动时间为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/131cb162-7334-4839-8f9b-2527df52b018.png?resizew=281)
(1)当
时,求梯形
的面积.
为何值时,梯形
的面积最大?最大面积是多少?
(2)当梯形
的面积等于三角形
的面积时,求线段
的长.
(3)设
的值分别取
时,所对应的三角形分别为
和
,判断这两个三角形是否相似,请证明你的结论.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/131cb162-7334-4839-8f9b-2527df52b018.png?resizew=281)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a585d18cafc764ef0dc144feedce19.png)
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(2)当梯形
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(3)设
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【推荐1】如图,在矩形ABCD中,AB=8,点E是边CD的中点,AE和BC的延长线交于点F,点G是边BC上的一点,且满足BG=
BC=a,连接AG,DG.且DG与AE交于点O.
![](https://img.xkw.com/dksih/QBM/2020/8/24/2534641580146688/2534808450605056/STEM/5968022359804f95bcc8f7c750b835de.png?resizew=246)
(1)若a=1,求△AOG的面积.
(2)当△AOG是直角三角形时,求所有满足要求的a值.
(3)记S△DOE=x,S△AOG=y.
①求y关于x的函数关系式;
②当∠AGO=∠DEA时,求tan∠DAE的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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(1)若a=1,求△AOG的面积.
(2)当△AOG是直角三角形时,求所有满足要求的a值.
(3)记S△DOE=x,S△AOG=y.
①求y关于x的函数关系式;
②当∠AGO=∠DEA时,求tan∠DAE的值.
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【推荐2】正方形
的边长为1,点
是对角线
上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/9375ed6a-f894-451c-9e96-46ad7e025aa3.png?resizew=404)
(1)如图1,过点
作
,垂足分别为点
,
求证:
.
(2)如图2,点
是
边上的点,连接
的值
是否随点
的位置改变而改变?若不变,求出它的值;若改变,请说明理由.
(3)如图3,求
的最小值.
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/9375ed6a-f894-451c-9e96-46ad7e025aa3.png?resizew=404)
(1)如图1,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94ab483705d37ece3778aeefe02db93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb34b0444d4757ebc00e89848178b69e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278c49a3647cca211a6ae1e397eb7484.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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是否随点
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(3)如图3,求
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