在
中,
,点D为边
的中点,动点P以每秒2个单位的速度从点B出发在射线
上运动,点Q在边
上,设点P运动时间为t秒(t>0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/e52f93ed-a927-4538-9897-0b839bd10768.png?resizew=192)
(1)用含t的代数式表示线段
的长.
(2)当
,点P在线段
上.若
和
全等,求t的值.
(3)当
,
为等腰三角形时,请直接写出
的度数为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef0cf4648098c7bfbbb66c24ded8c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/e52f93ed-a927-4538-9897-0b839bd10768.png?resizew=192)
(1)用含t的代数式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3223054560c8296227763d4cbb90194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f87c7bb45ab3ace6d77583e00419efd.png)
更新时间:2022-10-30 14:41:09
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
、
为
上的点,
平分
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/16/2902901247811584/2918972430598144/STEM/41d54d4d-31cb-4772-8472-d95679e6fa66.png?resizew=179)
(1)求证:
;
(2)若
,
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d365cc7ce9022654091eee60bc1c2b7.png)
![](https://img.xkw.com/dksih/QBM/2022/1/16/2902901247811584/2918972430598144/STEM/41d54d4d-31cb-4772-8472-d95679e6fa66.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c623fac28de771d3614c592303a12bcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fd4f041b100736d1ea356c674fc374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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【推荐2】我们在学习《2.4线段、角的对称性(4)》这节课的时候,课本中的例2证明了“三角形的三条角平分线相交于一点”,我们再重温一遍证明过程.
(1)请补全课本例2的证明过程;
例2 已知:如图,
的角平分线
相交于点P.
求证:点P在
的平分线上.
证明:过点P作
,垂足分别为F、M、N.
∵
平分
,点P在
上,
∴ .
同理 .
∴ .
∴点P在
的平分线上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/6993263c-12f0-47e7-a566-c9d5b5a32e12.png?resizew=143)
(2)运用上述结论解决下面的问题:如图,在
中,
,垂足为H,点D、E在
上,且
,连接
并延长,交
于点F,连接
.求证:
.
(1)请补全课本例2的证明过程;
例2 已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
求证:点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
证明:过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456236d56b35cacb9c1cf57f261d29dd.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∴ .
同理 .
∴ .
∴点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/6993263c-12f0-47e7-a566-c9d5b5a32e12.png?resizew=143)
(2)运用上述结论解决下面的问题:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7b39fcb6d96e2951c745c8978cbe2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb79d60c76042efea78c4627514bb18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c851c07c6e4b9a66e76168d6b16592e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/2258f6e4-2aa3-4533-b715-5153f6a21a26.png?resizew=186)
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【推荐1】如图,在平面直角坐标系中,一次函数图象与x轴,y轴分别交于点A(8,0),B(0,4),点C的坐标为(3,0),动点D是射线BO上一个动点,连结CD,过点C作CD⊥FC,交一次函数图象于点F.
(1)求这个一次函数的解析式;
(2)过点F作FE⊥x轴,垂足为点E,当△OCD与△EFC全等时,求出满足条件的点F的坐标;
(3)点D在运动过程中,是否存在使△ACF是等腰三角形?若存在请求出点F的坐标;不存在,请说明理由.
(1)求这个一次函数的解析式;
(2)过点F作FE⊥x轴,垂足为点E,当△OCD与△EFC全等时,求出满足条件的点F的坐标;
(3)点D在运动过程中,是否存在使△ACF是等腰三角形?若存在请求出点F的坐标;不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/10/b4e204a2-d50a-4148-abbd-7ea8d91ce354.png?resizew=186)
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解答题-应用题
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【推荐2】如图,某村庄有一块五边形的田地,
,
,连接对角线
,
,
.
,
与
之间的数量关系是____________.
(2)为保护田内作物不被牲畜踩踏,村里决定给这块田地的五边上围一圈木栅栏,已知每米木栅栏的建造成本是50元,则建造木栅栏共需花费多少元?(提示:延长
至点
,使
)
(3)在
和
区域种上小麦,已知每平方米田地的小麦播种量为
克,请直接写出需提前准备多少千克的小麦种.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d714f8ca3a63037c3b9114278bc12f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766ae8acaddb28f8a5a55eff086fd976.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
(2)为保护田内作物不被牲畜踩踏,村里决定给这块田地的五边上围一圈木栅栏,已知每米木栅栏的建造成本是50元,则建造木栅栏共需花费多少元?(提示:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b555a0bb6b5132ecfb9cae3769912c3.png)
(3)在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fc3a8382c11e48a51c9fd3ebbbc306.png)
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【推荐2】在△ABC中,AB、AC的垂直平分线分判交BC于点E、F.
(1)如图,∠B=∠C=20°,求∠EAF的度数;
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610570803511296/2613893501124608/STEM/e16dea9f-c297-44e7-966d-1b4e77cee12d.png?resizew=152)
(2)如图,AB≠AC,且
.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610570803511296/2613893501124608/STEM/45f61f50-c44b-4418-806f-04ddcfda2768.png?resizew=250)
①若∠BAC=130°,则∠EAF=_______°;若∠BAC=n°,则∠EAF=_______°;
②当∠BAC=_______°时,AE⊥AF;
③若BC=a,则△AEF的周长为____________.(用含a的式子表示)
(1)如图,∠B=∠C=20°,求∠EAF的度数;
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610570803511296/2613893501124608/STEM/e16dea9f-c297-44e7-966d-1b4e77cee12d.png?resizew=152)
(2)如图,AB≠AC,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c494c4fbf61f655ad3aa2f6a32df453c.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610570803511296/2613893501124608/STEM/45f61f50-c44b-4418-806f-04ddcfda2768.png?resizew=250)
①若∠BAC=130°,则∠EAF=_______°;若∠BAC=n°,则∠EAF=_______°;
②当∠BAC=_______°时,AE⊥AF;
③若BC=a,则△AEF的周长为____________.(用含a的式子表示)
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