1 . (1)如图①,A,E,F,C四点在一条直线上,
,过点E,F分别作
,
,连接
交
于点G,若
试说明
.
(2)若将
沿
方向移动变为如图②的图形,(1)中其他条件不变,上述结论是否仍成立?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd5ed17eee530c8c3cc397751bf25fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690c06742fc47007c6a078ede7ecabf6.png)
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/6eb341ab-6e38-4a15-a4f3-da4445001099.png?resizew=477)
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2 . 如图,
,
分别是
,
上的点,过点
作
于点
,作
于点
,若
,
,则下面三个结论:①
;②
;③
,正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957143960715264/3064268570173440/STEM/bb1a97195ddf4047b600372c06ff0191.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c462b4a116f299f696ce3f1b5029d654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00db02a22bc96985e7c14a8de04e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ecd96adaec63c5bbd65f59f885ecfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19d8737f7a9ed1068d21fe8c3bd719d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9ccbcb773c5bd43d1fd59ad4778c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2462c9762871fe94dd1ea914fdbe282e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f907fc7c02d84aff208a2a69d4dc4382.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957143960715264/3064268570173440/STEM/bb1a97195ddf4047b600372c06ff0191.png?resizew=156)
A.①③ | B.②③ | C.①② | D.①②③ |
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3 . 如图,在矩形
中,点
,
分别在边
,
上,且
,求证:
.
![](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/a0ed1ec316bc54c37c4286c208f55667.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/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/3a3a6075-cb80-48b1-b3e9-c84e04874501.png?resizew=199)
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4 . 已知四边形
,垂足分别为C、A,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/3ac14f3c-081d-4a01-83e8-bc49648805fe.png?resizew=138)
(1)求证:
.
(2)求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e7a5bb4e8fb89f701a393885822889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/3ac14f3c-081d-4a01-83e8-bc49648805fe.png?resizew=138)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4658e54355d2ea0c17997ee01349a754.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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2022-08-29更新
|
252次组卷
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5卷引用:广西壮族自治区桂林市恭城瑶族自治县2021-2022学年八年级下学期期末数学试题
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5 . 如图,AB=AD,∠ABC=∠ADC=90°,EF过点C,BE⊥EF于点E,DF⊥EF于点F,BE=DF.求证:EC=CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/275c2602-dec7-4e47-995b-6befbea187f3.png?resizew=238)
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6 . 如图,在△ABC中,AB=10cm,BC=8cm,AC=6cm,动点P从点B出发,以2cm/秒的速度沿BC移动至点C,设运动时间为t秒.当点P恰好运动到∠BAC平分线上时,求t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/f284b52b-4197-4a4e-82d4-c5080000fe8f.png?resizew=156)
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2022-08-17更新
|
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2卷引用:广西贺州市平桂区2021-2022学年八年级下学期期中考试数学试题
7 . 如图,在
和
中,
,
,AC与BD相交于点O.
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fec9e3bf7ff287df2cbdff8addfaf5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38aa46b02f08fca3728f1158ea0047fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/fe193077-be17-4a60-9c8b-cbf4fa18e6cf.png?resizew=178)
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8 . 如图,在△ABC中,∠C=90°,AD平分∠BAC,DE⊥AB于点E,点F在AC上,且BD=DF.求证:
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978605805854720/3045694100881408/STEM/b58e68a4683c4a8daa7f85d8233a314e.png?resizew=153)
(1)CF=EB;
(2)AF+EB=AE.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978605805854720/3045694100881408/STEM/b58e68a4683c4a8daa7f85d8233a314e.png?resizew=153)
(1)CF=EB;
(2)AF+EB=AE.
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2022-08-16更新
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3卷引用:广西壮族自治区贵港市桂平市2021-2022学年八年级下学期期中数学试题
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9 . 如图,已知
,E是AC上一点,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/70150e36-a7b7-43a8-81c7-8ae1703eec36.png?resizew=170)
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2022-08-15更新
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2卷引用:广西壮族自治区来宾市忻城县2021-2022学年八年级下学期期中数学试题
10 . 如图,点B,E,C,F在同一直线上,∠A=∠D=90°,BC=FE,AB=DF.求证:∠B=∠F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/2c7da4cc-9705-41a9-8ba2-d772d18e3524.png?resizew=202)
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2022-08-11更新
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