在△ABC 中,AB=AC,D 是直线 BC 上一点(不与点 B、C 重合),以 AD 为一边在 AD的右侧作△ADE,AD=AE,∠DAE=∠BAC,连接 CE.
(1)如图 1,当点 D 在线段 BC 上时,求证:△ABD≌△ACE;
(2)如图 2,当点 D 在线段 BC 上时,如果∠BAC=90°,求∠BCE 的度数;
(3)如图 3,若∠BAC=α,∠BCE=β.点 D 在线段 CB 的延长线上时,则α、β之间有怎样 的数量关系?并证明你的结论.
(1)如图 1,当点 D 在线段 BC 上时,求证:△ABD≌△ACE;
(2)如图 2,当点 D 在线段 BC 上时,如果∠BAC=90°,求∠BCE 的度数;
(3)如图 3,若∠BAC=α,∠BCE=β.点 D 在线段 CB 的延长线上时,则α、β之间有怎样 的数量关系?并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2018/7/11/1986049421606912/1986382645043200/STEM/db1072434722414683ef7aee81b9702b.png?resizew=142)
![](https://img.xkw.com/dksih/QBM/2018/7/11/1986049421606912/1986382645043200/STEM/4ae94e90cff8480c8a3e3cd3299f75ed.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/2018/7/11/1986049421606912/1986382645043200/STEM/be70e928d4dc4dffae0c4e4d9c26080c.png?resizew=159)
更新时间:2018-07-11 20:48:44
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解答题-证明题
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【推荐1】如图,△ABC中,∠B =∠C,点D、E分别是边AB、AC上的点,PD平分∠BDE交BC于H,PE平分∠DEC交BC于G,DQ平分∠ADE交PE延长线于Q.
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(1)∠A+∠B+∠C+∠P +∠Q = °;
(2)猜想∠P与∠A的数量关系,并证明你的猜想;
(3)若∠EGH =112°,求∠ADQ 的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/9ff73c51-da92-4477-af90-ee036bd90741.png?resizew=128)
(1)∠A+∠B+∠C+∠P +∠Q = °;
(2)猜想∠P与∠A的数量关系,并证明你的猜想;
(3)若∠EGH =112°,求∠ADQ 的大小.
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解答题-问答题
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【推荐2】如图,在
中,
,
,
.
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(1)请说明
平分
;
(2)过点
作
, 垂足为
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的度数.
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(1)请说明
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(2)过点
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解答题-作图题
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【推荐1】已知等腰直角三角形
如图所示放置,根据题目要求补全图形,并保留作图痕迹.
①作点
关于线段
的对称点点
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②在
延长线上取得一点
,连接
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为直角边作等腰直角三角形
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③连接
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/aebf389f-6413-4c13-a94a-3e25a0eff59f.png?resizew=159)
(1)找出补全后图中与
全等的三角形,并给予证明(说明:结论中不得含有未标识的字母);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdd615843adf3e011e5b72f9c608bfa.png)
①作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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③连接
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(1)找出补全后图中与
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(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b59bfa454f1729db06a42362086230f.png)
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【推荐2】如图,P是等边三角形
内的一点,连接
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,
,
,
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为边作等边三角形
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(1)求证:
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时,若
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