如图所示,在正方形ABCD的边CB的延长线上取点F,连接AF,在AF上取点G,使得AG=AD,连接DG,过点A作AE⊥AF,交DG于点E.
(1)若正方形ABCD的边长为4,且tan∠FAB=
,求FG的长;
(2)求证:AE+BF=AF.
(1)若正方形ABCD的边长为4,且tan∠FAB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)求证:AE+BF=AF.
![](https://img.xkw.com/dksih/QBM/2018/6/1/1958032631865344/1960934059671552/STEM/af8f89fce77948bcb43ab169092b115e.png?resizew=162)
更新时间:2018-06-05 21:53:28
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解答题-证明题
|
适中
(0.65)
【推荐1】如图①,在正方形
中,
,点
、
分别在
、
上,
,试探究
尽面积的最小值.下面是小丽的探究过程
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/e6fd5469-8424-44da-adf6-c53dce072388.png?resizew=336)
(1)延长
至
使
;连接
,可以证明
,请完成她的证明.
(2)设
,
,
.
①结合(1)中的结论,通过计算得到
与
的部分对应值.请写出表格中
的值;
写出解答过程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ef244e9cd295656496929fbb46a9a5.png)
②利用上表和(1)中的结论通过描点、连线可以分别画出函数
、
的图象.请在图②中完善她的画图;
(3)根据以上探究,估计
面积的最小值约为______
结果怙计到
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77847ba0afc18466b17cea483eb29cdd.png)
![](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/764509115979e9958101808383672ec0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15347d7870120325031b981affdac48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/e6fd5469-8424-44da-adf6-c53dce072388.png?resizew=336)
(1)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21002725043bdace95b3244d4c75dd74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e94b7eca12a2bde607733be9a7d268e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef173e640465fab2f68d1b3865a2357.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0a179491094a0b4fd4b04cbd99b2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1371cc17a626029646edf378dafccb3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d11c62bb3880739a5b28f11f37775463.png)
①结合(1)中的结论,通过计算得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81968aa7eaa2f1c6294435ae72ebc11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de629ae869e25cbd394121fc990d2f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ef244e9cd295656496929fbb46a9a5.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81968aa7eaa2f1c6294435ae72ebc11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdf7aaf44733c758606ff325047ab1e.png)
(3)根据以上探究,估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15347d7870120325031b981affdac48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de629ae869e25cbd394121fc990d2f85.png)
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解答题-问答题
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适中
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【推荐2】如图,EF为
的直径,点C为EF延长线上一点,动点Q从点E出发沿EC方向以
的速度运动,同时动点P从点C出发以
的速度沿CE方向运动,当两点相遇时停止运动,过点Q作EF的垂线,分别交
于点A和点B,已知
的半径为3,设运动时间为t秒
.
若
,则当
______时,四边形AEBP为菱形;
当EC的长为多少时,存在t的值,使四边形AEBP为正方形?请说明理由,并求出此时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,
是
的高线,垂足为点
是
的中线.
,
.
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(1)求
的长;
(2)求
的值.
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(1)求
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(2)求
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在平面直角坐标系中,抛物线
与
轴交于
两点,点
在点
的左边,与
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(1)求点
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(3)若点
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