如图,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/73b78267-fd34-4383-9065-dadad1613aa9.png?resizew=194)
求证:(1)
;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33792d6175afa2f90d1697aedac80c52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/73b78267-fd34-4383-9065-dadad1613aa9.png?resizew=194)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0922341910e07e79a2dc6cdd587a5ce6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e20b970f3b0dc1c9a3de6eb09beead.png)
更新时间:2019-09-12 17:13:03
|
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解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,△ABC和△DCB有公共边BC,且AB=DC,作AE⊥BC,DF⊥BC,垂足分别为E、F,AE=DF,那么求证AC=BD时,需要证明三角形全等的是Rt△ABE≌Rt△DCF,△AEC≌DFB.说明理由.
![](https://img.xkw.com/dksih/QBM/2018/8/1/2001119125340160/2004642869174272/STEM/87ee34db796740b887248e704f3fb713.png?resizew=128)
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解答题-证明题
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适中
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【推荐2】【感知】如图①,点F是正方形
的边
上一点,点E是
延长线上一点,且
.易证
,进而证得
.
【应用】(1)如图②,在正方形
中,点F、G分别在边
、
上,且
.求证:
.
【拓展】(2)如图③,在四边形
中,
,
,点M、N分别在边
、
上,且
.若
,
,则四边形
的周长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a73e13066f5ab14b07a1588d968578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2969e3801d9d667ca88a2b7dfcfde4d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
【应用】(1)如图②,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf84ba8e3ce4dab1c9efa1e0e59f0495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/798d7e935a7116c5aed37a8cc25dc541.png)
【拓展】(2)如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719d86287864e8d2c870817113296207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8f670b1ddb7bf00741f14965e127e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de006cef9e5efbcbf74229845804650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d299309b0a67f88e5d70dbb9d861976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3529b42a256d3ddd0d90605629ec4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/28be018e-15a2-4f5c-8a26-48288e90fc43.png?resizew=350)
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解答题-问答题
|
适中
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【推荐1】如图,已知:PA=PB,AC=BD,PC=PD,△PAD和△PBC全等吗?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/24abe24c-5a68-4d2d-a337-23eea5300593.png?resizew=116)
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解答题-作图题
|
适中
(0.65)
【推荐2】某数学兴趣小组学习了尺规作图和等腰三角形以后,研究下面问题,如图等边
,E是
的延长线上一点,他进行如下操作:
第一步:以A为圆心,适当长为半径画弧,交
于M,
于N;
第二步:以E为圆心,
为半径画弧,交
于P,再以P为圆心,
为半径画弧,两弧交于Q;
第三步:作射线
,交
的延长线于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/c6362ff8-1fed-4a3f-ae8d-da6b4e4e94b2.png?resizew=385)
(1)填空:图①中
与
大小关系_____,依据是______.
(2)判断
的形状,并说明理由.
(3)如图②延长
到D,连
,使
,判断
之间关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
第一步:以A为圆心,适当长为半径画弧,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
第二步:以E为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
第三步:作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/c6362ff8-1fed-4a3f-ae8d-da6b4e4e94b2.png?resizew=385)
(1)填空:图①中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a298ed3325baafd125f688496fd52e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
(3)如图②延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132c35a2e54397d7393b1ab8fc600e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0d4583b7d106a925d63df8ff2d8286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e449ef4ca245f6939855af28ecf3be.png)
您最近一年使用:0次