如图,Rt△ABE中,∠A=90°,点C在AB上,∠CEB=2∠AEC=45°.
(1)求∠B的度数;
(2)求证:BC=2AE.
(1)求∠B的度数;
(2)求证:BC=2AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/ef1f10f5-759c-4f74-bd65-91bb0251d4e9.png?resizew=170)
更新时间:2020-01-06 20:05:01
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【推荐1】如图1,在等腰
中,
,D是BC的中点,E为边AC上任意一点,连接DE,将线段DE绕点D逆时针旋转90°得到线段DF,连接EF,交AB于点G.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897666548498432/2899983590416384/STEM/6bc16766-ed3a-478a-8335-23e4e61b7de7.png?resizew=495)
(1)若
,
,求ED的长;
(2)如图2,点G恰好是EF的中点,连接BF,求证:
;
(3)如图3,将
沿DF翻折,使得点B落在点P处,连接AP、EP,若
,当
最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897666548498432/2899983590416384/STEM/6bc16766-ed3a-478a-8335-23e4e61b7de7.png?resizew=495)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
(2)如图2,点G恰好是EF的中点,连接BF,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11253e3f7c28265d3fd96e19fa620e.png)
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b60a048024136e0fd06d80fc9fd58b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
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【推荐2】如图,在平面直角坐标系中,点O为坐标原点,抛物线
交x轴于A、B两点,交y轴于点C,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/e007f16c-5349-481b-b73b-14742d0ad764.png?resizew=844)
(1)求抛物线的解析式;
(2)点D为第一象限抛物线上一点,连接
、
,设点D的横坐标为t,
的面积为S,求S与t之间的函数关系式;(不要求写出自变量t的取值范围)
(3)在(2)的条件下,连接
,过点D作
轴,垂足为点E,延长
至点F,连接
,使得
,连接
、
,
交x轴于点G,点M为y轴负半轴上一点,连接
,若
,且
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102068e41a208a7ba4fc87a125d08ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/e007f16c-5349-481b-b73b-14742d0ad764.png?resizew=844)
(1)求抛物线的解析式;
(2)点D为第一象限抛物线上一点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1caea6e1bca3ef6f86542c03f076c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea6ba9552c3dadf0ef73629e520ccd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15d9541b5cb50f7e75b66c509683402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】如图,在
中,
,
,以
为边作等腰
,其中
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/ee8ef4f1-cea1-46b4-9054-e2344234587b.png?resizew=545)
(1)求证:
;
(2)作
的垂直平分线分别交
,
于点
,
.
①如图1,
,求证:
;
②如图2,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf82e97595128f030504932bd738e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/ee8ef4f1-cea1-46b4-9054-e2344234587b.png?resizew=545)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d73bfafafc6b1418079f4f19ba55afd.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1212f222bed8b39156d13de8a35f40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2147ce587401c2434a80fcfae59713a2.png)
②如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbab4a3f9636fe3eeee75ba79d08a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f223fda32883bf5b468f84c888ae8aa.png)
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解答题-作图题
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【推荐2】如图,
中,
.
. 将
绕点
顺时针旋转60°到点
,点
与点
关于直线
对称,连接
,
,
.
(1)依题意补全图形:
(2)判断
的形状,并证明你的结论;
(3)请问在直线
上是否存在点
.使得
恒成立若存在,请用文字描述出点
的准确位置,并画图证明;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a4a3077ceb252c79ce4b4fad87ce80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)依题意补全图形:
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222d3ec99bc21b586b083bd9d67b225.png)
(3)请问在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102d61f155a98363b70da2ef8e1b4d29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/a7d06aec-97e3-44ee-85e3-4cb267221433.png?resizew=87)
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【推荐1】已知正方形
,
为对角线
上一点.
【建立模型】
(1)如图1,连接
,
.求证:
;
【模型应用】
(2)如图2,
是
延长线上一点,
,
交
于点
.求证:
是等腰三角形;
【模型迁移】
(3)如图3,
是
延长线上一点,
,
交
于点
,
,
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【建立模型】
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
【模型应用】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0136a534af8311391c2a8e532614aa02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4da8c9541c01c2fa51788ed30cd6a9.png)
【模型迁移】
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0136a534af8311391c2a8e532614aa02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb55961fe96e155242d18d98e5c2261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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【推荐2】如图,△ABC是⊙O的内接三角形,AB是⊙O的直径,OD⊥AB于点O,分别交AC、CF于点E、D,且CF是⊙O的切线.
(1)求证:DE=DC;
(2)若⊙O的半径为5,OE=1,求DE的长.
(1)求证:DE=DC;
(2)若⊙O的半径为5,OE=1,求DE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/dd48769a-5d0a-4621-83ee-786f9e1f79d3.png?resizew=176)
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