如图,在
中,点
在边
上,
.求证:
.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddb3cae61ec3ddd5def5cef1c11931c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/ed00c288-dab8-45f4-aef4-d7b85dfcb702.png?resizew=180)
更新时间:2023-12-25 13:34:06
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解答题-问答题
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【推荐1】如图已知三角形ABC内一点 P.
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715942025986048/2782348664291328/STEM/b5d564bb-3f6a-4d2b-864a-deca7b604224.png)
(1) 过 P点画直线 EF∥BC,分别交 AB,AC 于点 E,F;
(2) 过 P点画直线 PD 使 PD⊥AB,垂足为 D 点.
(3)若∠B=50°,则∠DPE 等于多少度?
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(1) 过 P点画直线 EF∥BC,分别交 AB,AC 于点 E,F;
(2) 过 P点画直线 PD 使 PD⊥AB,垂足为 D 点.
(3)若∠B=50°,则∠DPE 等于多少度?
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解答题-问答题
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【推荐2】如图,BE是
的平分线,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/25/7d37982a-5e04-4c88-a7b0-24c7174ad5fb.png?resizew=138)
(1)判断DE与BC是否平行,并说明理由.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18e1b54a2975ef9e7b79345695ed4df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/25/7d37982a-5e04-4c88-a7b0-24c7174ad5fb.png?resizew=138)
(1)判断DE与BC是否平行,并说明理由.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecbc3a6fd6ae27c377842f2a6b67540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
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解答题-证明题
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【推荐1】如图,在△ABC中,AD⊥BC于点D,BE⊥AC于点E,BE,AD相交于点F,BF=AC.
(1)求证:△BDF≌△ADC.
(2)若AF=1,DC=2,求AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/93b893c1-1e27-490d-83c1-d532d1047bf3.png?resizew=130)
(1)求证:△BDF≌△ADC.
(2)若AF=1,DC=2,求AB的长.
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【推荐2】如图,B,E,C,F在一条直线上,已知
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f34543be1256713f6b3b0dbc46ab92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7807044e99fc6cbca92d70396ee53fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3adea2cdc3b64f1bf79265d4cb1425ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1394e4f95b177943f6040f242c5b2212.png)
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