如图,点B,F,C,E在一条直线上,AB=DE,FB=CE,AB∥ED.求证:AC∥FD.
![](https://img.xkw.com/dksih/QBM/2021/2/26/2666175148687360/2671156293074944/STEM/5a078d790a9642da831c3553b2abc16b.png?resizew=218)
20-21八年级上·福建厦门·期末 查看更多[2]
更新时间:2021-03-05 08:24:18
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解答题-证明题
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适中
(0.65)
【推荐1】请将下列证明过程补充完整:
已知:如图,点P在CD上,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/944a6d50-72ee-4436-a483-4cbe3e8f14dd.png?resizew=213)
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b333110550208ffce4ec642f78075f.png)
证明:∵
(已知)
∴______//______(______)
∴
______(______)
又∵
(已知)
∴
______![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5336d5a4861e78c3c3a18ce3b07f688.png)
即
______(等式的性质)
∴
//
(内错角相等,两直线平行)
∴
(______)
已知:如图,点P在CD上,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f8b62b07807fec13151fd82883142e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/944a6d50-72ee-4436-a483-4cbe3e8f14dd.png?resizew=213)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b333110550208ffce4ec642f78075f.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f8b62b07807fec13151fd82883142e.png)
∴______//______(______)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe7d4990bc99bd1a7e0aa1ce7f167a8.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d84e91d41f8cf620f995902ff2345f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5336d5a4861e78c3c3a18ce3b07f688.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b333110550208ffce4ec642f78075f.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,已知AB=ED,BC=DF,AF=EC.
![](https://img.xkw.com/dksih/QBM/2018/6/1/1957900904808448/1963135697944576/STEM/42b0aabf-f633-44f9-8d4b-1993afb4402a.png?resizew=250)
(1)求证:△ABC ≌△EDF;
(2)求证:BC∥DF.
![](https://img.xkw.com/dksih/QBM/2018/6/1/1957900904808448/1963135697944576/STEM/42b0aabf-f633-44f9-8d4b-1993afb4402a.png?resizew=250)
(1)求证:△ABC ≌△EDF;
(2)求证:BC∥DF.
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在△ABC外分别以AB,AC为边作两个大小不同的等腰直角三角形ABD和等腰直角三角形ACE,其中∠DAB=∠CAE=90°,AB=AD,AC=AE.连结DCBE交于F点.
(1)请你找出一对全等的三角形,并加以证明;
(2)直线DC、BE是否互相垂直,请说明理由;
(3)求证:∠DFA=∠EFA.
(1)请你找出一对全等的三角形,并加以证明;
(2)直线DC、BE是否互相垂直,请说明理由;
(3)求证:∠DFA=∠EFA.
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101611224735744/2103491261726720/STEM/71bfb2529b7e40ed8aa33dfe40131bf3.png?resizew=203)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图1,图2,图3,在
中,分别以
为边,向
外作正三角形,正四边形,正五边形,
相交于点
.(正多边形的各边相等,各个内角也相等)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/89b9e204-7b56-497e-971a-96ae03faf721.png?resizew=629)
①如图1,求证:△ABE≌△ADC;
②探究:如图1,∠BOD=
;
③如图2,∠BOD=
;
④如图3,∠BOD=
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa9a97b08d13208fb383813ab1478fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec48b126c7b40873c61353c655e4ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/89b9e204-7b56-497e-971a-96ae03faf721.png?resizew=629)
①如图1,求证:△ABE≌△ADC;
②探究:如图1,∠BOD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a02295b56d4f94521133b91e1403e4.png)
③如图2,∠BOD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a02295b56d4f94521133b91e1403e4.png)
④如图3,∠BOD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a02295b56d4f94521133b91e1403e4.png)
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