如图,把长方形纸片ABCD沿EF折叠,使点B落在边AD上的点B′处,点A落在点A′处.
(1)试说明:B′E=BF;
(2)若AE=3,AB=4,求BF的长.
(1)试说明:B′E=BF;
(2)若AE=3,AB=4,求BF的长.
![](https://img.xkw.com/dksih/QBM/2021/11/3/2843303623335936/2844935331897344/STEM/8a7eec44-bca7-459f-82b4-23b172994e0a.png?resizew=261)
20-21八年级下·吉林长春·开学考试 查看更多[3]
吉林省长春外国语学校2020-2021学年八年级下学期期初考试数学试题第14讲 勾股定理的应用-华东师大版八年级上册课中及课后分层同步练(已下线)第20讲 直角三角形 (讲练)-2021年中考数学一轮复习讲练测
更新时间:2021-11-05 20:58:39
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适中
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【推荐1】如图,在中,
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)如果点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
①若点Q的运动速度与点P的运动速度相等,经过后,
与
是否全等,请说明理由;
②若点Q的运动速度与点P的运动速度不相等,当点Q的运动速度为多少时,能够使与
全等?
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解答题-证明题
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适中
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【推荐2】如图,在
中,
,
为
边上一点,过
作
,分别与
,
相交于点
和点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/bfd1fc72-53da-41b0-8522-ba39537e2549.png?resizew=163)
(1)求证:
;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8222615f54920eb8b9f35a0fee2f9837.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/bfd1fc72-53da-41b0-8522-ba39537e2549.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc512283127d0bd2acc0bea0716c642.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,平面直角坐标系中,点D的坐标为
,过点D作
轴,
轴,点E为y轴上一点,将
沿直线
折叠,点A落在边
上的点F处.
(2)求
的长;
(3)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269002d15dc6411604489d5d1fa34c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325c1369a0db0126e12876aa066a7436.png)
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(2)求
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(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e434d97bbebe34026a16b898352d580.png)
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解答题-证明题
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名校
【推荐2】如图,矩形纸片
中,
,现将
重合,使纸片折叠压平,折痕为
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/83913984-67df-409d-a4a6-1d0fdc747ac9.png?resizew=164)
(1)证明:
;
(2)判断四边形
是什么特殊四边形?证明你的结论;
(3)求重叠部分
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d335a46a40c5b8729c8ba4c298658e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/83913984-67df-409d-a4a6-1d0fdc747ac9.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c055a0420487255546b800ad8c861f.png)
(2)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(3)求重叠部分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
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