在Rt△ABC中,∠ACB=90°,D为AB的中点,DF分别交AC于点E,交BC于点F
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913317739511808/2913947546755072/STEM/62f27fac-6e58-4641-9ac9-01a561255053.png?resizew=413)
(1)如图(1),如果CA=CB,求证:AE2+BF2=EF2.
(2)如图(2),如果CA<CB,那么(1),请证明;若不成立
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913317739511808/2913947546755072/STEM/62f27fac-6e58-4641-9ac9-01a561255053.png?resizew=413)
(1)如图(1),如果CA=CB,求证:AE2+BF2=EF2.
(2)如图(2),如果CA<CB,那么(1),请证明;若不成立
更新时间:2022-02-11 09:04:22
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图1,在正方形ABCD中,点E是CD上一点(不与C,D两点重合),连接BE,过点C作CH⊥BE于点F,交对角线BD于点G,交AD边于点H,连接GE.
(1)求证:CH=BE;
(2)如图2,若点E是CD的中点,当BE=12时,求线段GE的长;
(3)设正方形ABCD的面积为S1,四边形DEGH的面积为S2,点E将CD分成1∶2两部分,求
的值.
(1)求证:CH=BE;
(2)如图2,若点E是CD的中点,当BE=12时,求线段GE的长;
(3)设正方形ABCD的面积为S1,四边形DEGH的面积为S2,点E将CD分成1∶2两部分,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/d0a341f4-dd12-4357-ba5f-7d76514b822a.png?resizew=320)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在△ABC中,∠BAC=90°,AB=AC,BD平分∠ABC时
(1)若CE⊥BD于E,①∠ECD= 0;②求证:BD=2EC;
(2)如图,点P是射线BA上A点右边一动点,以CP为斜边作等腰直角△CPF,其中∠F=90°,点Q为∠FPC与∠PFC的角平分线的交点.当点P运动时,点Q是否一定在射线BD上?若在,请证明,若不在;请说明理由.
(1)若CE⊥BD于E,①∠ECD= 0;②求证:BD=2EC;
(2)如图,点P是射线BA上A点右边一动点,以CP为斜边作等腰直角△CPF,其中∠F=90°,点Q为∠FPC与∠PFC的角平分线的交点.当点P运动时,点Q是否一定在射线BD上?若在,请证明,若不在;请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/10/5/1788865400250368/1788945968259072/STEM/9b5b6fde9db3432c815ceb18c66a5340.png?resizew=161)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在等腰
中,
.点D是边
的延长线上一点,连接
,作点D关于直线
的对称点E,作直线
,交
的延长线于点F,过点E作直线
的垂线,交
的延长线于G、交
的延长线于H.
(2)设
,求
的大小(用含α的式子表示);
(3)用等式表示
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42798067d911f96e5784cb138319c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4a5adc331a7cf03391f0dedf6b5a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92031b1ad6ff9817b0812ac88f8f9438.png)
(3)用等式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,在∠AOB的内部有一个定点P.
(1)试在OA、OB上确定C、D两点,使△PCD的周长最短;(保留作图痕迹,不写作法)
(2)若OP=1,∠AOB=30°,求△PCD的周长最小值.
(1)试在OA、OB上确定C、D两点,使△PCD的周长最短;(保留作图痕迹,不写作法)
(2)若OP=1,∠AOB=30°,求△PCD的周长最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/ab2f64f2-439a-40e9-a2ba-b412ee8b76ec.png?resizew=133)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,
,连接
,将线段
绕点
顺时针旋转90°得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/fe0a86ee-cb62-4d3b-aa7f-e151993ead1c.png?resizew=173)
(1)依题意,补全图形,并证明:
;
(2)求
的度数;
(3)若
为线段
的中点,连接
,请用等式表示线段
与
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6901e8b018a80e917540462d2f3aadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/fe0a86ee-cb62-4d3b-aa7f-e151993ead1c.png?resizew=173)
(1)依题意,补全图形,并证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2cdb82ad470a6d495d887ae362b72cc.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5135b0b4f25d7f5e0077e4fa33216624.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,楼房
的高度为30米,楼房
的高度为20米,两栋楼房之间的距离
为40米,某天,
楼发生火灾,所有群众都逃到楼顶等待救援,消防队员决定用消防车上的云梯把
楼顶的群众转运到安全的
楼的楼顶(转运过程中云梯的长度保持不变),已知消防车的云梯支点
距离地面的高度为2米,求消防车的停靠点
到楼房
的底端
的距离(消防车的宽度忽略不计).
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/1810ccb1-cb08-4d53-9dfc-3ca639b8a0bb.png?resizew=183)
您最近一年使用:0次