1 . 【问题初探】
(1)在数学活动课上,李老师给出如下问题:
如图1,在
中,点
是
的中点,点
是
的一个三等分点,且
,连接
,
交于点
,求证:
.
①如图2,小鹏同学利用“三角形中位线的性质”的解题经验,取
的中点
,连接
,再通过“全等三角形的性质”解决问题;
②如图3,小亮同学利用“三角形相似的性质”的解题经验,过点
作
,交
的延长线于点
,再通过“全等三角形的性质”解决问题.
【类比分析】
(2)李老师发现之前两名同学都运用了数学的转化思想,将证明三角形线段的关系转化为我们熟悉的角度去理解.为了帮助同学们更好地感悟转化思想,李老师又提出了一个问题,请你解答:如图4,在
中,点
是
的中点,点
,
是
的三等分点,
,
与
分别交于点
,
,求
的值.
【学以致用】
(3)如图5,在
中,
,在射线
上取点
,使
,连接
,在
上取点
,射线
,
相交于点
,当
时,求
的值.
(1)在数学活动课上,李老师给出如下问题:
如图1,在
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a04f902d067b645443f67aa7793cdbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7b7247f3e95199da0fca6e82407c59.png)
①如图2,小鹏同学利用“三角形中位线的性质”的解题经验,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
②如图3,小亮同学利用“三角形相似的性质”的解题经验,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e660b5bc650c65167910eb61de342576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
【类比分析】
(2)李老师发现之前两名同学都运用了数学的转化思想,将证明三角形线段的关系转化为我们熟悉的角度去理解.为了帮助同学们更好地感悟转化思想,李老师又提出了一个问题,请你解答:如图4,在
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf3bda6e656640bc59c4a87ddb420c9.png)
【学以致用】
(3)如图5,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525cef76ab5396af0846205d665388bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef9500289a895ad4d69f113a11e7525.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efd0a4aa197d2a28f1d7828a39122b6.png)
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2 . 【综合与实践】
【探究】(1)小学我们就学过同底等高的两个三角形的面积相等,后来我们又学到等高的两个三角形的面积之比等于与高对应的底边长之比,如图(1),
的高
和
的高
相等,则
同样,同底的两个三角形,如果面积相等,也有类似的结论,若图形位置特殊,由此会产生一些新的结论,下面是小江同学探索的一个结论,请帮助小江完成证明.
和
的面积相等,求证:
.
证明:分别过点
、点
作
和
底边
上的高线
,
.
【应用】(2)把图(3)的四边形
改成一个以
为一边的三角形,并保持面积不变,请画出图形,并简要说明理由.
【拓展】(3)用上述探究的结论和已经证明的结论,证明三角形的中位线定理.
已知:如图(4),______.
求证:______.
证明:
【探究】(1)小学我们就学过同底等高的两个三角形的面积相等,后来我们又学到等高的两个三角形的面积之比等于与高对应的底边长之比,如图(1),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301941880d65680d8133f05b2785ce64.png)
![](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/4adf90a8c2b29334cdc5aa5b554991f9.png)
证明:分别过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
【应用】(2)把图(3)的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【拓展】(3)用上述探究的结论和已经证明的结论,证明三角形的中位线定理.
已知:如图(4),______.
求证:______.
证明:
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7日内更新
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|
2卷引用:2024年浙江省杭州市滨江区九年级中考数学一模试题
3 . 在
中 ,
是
边上的中线,
是
边上的中线,
、
交于点
.
(1)求证:点
在
边的中线上.
如图①,连接
并延长,与
交于点
,连接
,与
交于点
.证明途径可以用下面的框图表示,请填写其中的空格;
时,
①如图②,连接
,求 证 :
;
②若
, 则
面积的最大值为______.
(3)如图③,已知线段
、
,求作
,使
,
,且
,
(要求:尺规作图,保留作图痕迹,写出必要说明.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
如图①,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
①如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d782697ae0a30818af043d523d9893.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)如图③,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
(要求:尺规作图,保留作图痕迹,写出必要说明.)
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4 . 如图①,在锐角
中,
于点
为
上一点,
为
边的中点,连接
并延长交边
于点
为
边的中点,连接
.
,求
的长;
(2)如图②,若
,
(ⅰ)求证:
;
(ⅱ)求证:
为
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94706a511221f294777dcf92387379ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53591deca86f5710d3d3f596511d6810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82ed2b418bd9516d739621328b831c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46902c589b964c055aee819dc3e4ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001c3c5c39344960ef7fc36e58d84e83.png)
(ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9557b0cca036b8902bf3ef673f8b866.png)
(ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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5 . 凡奥贝尔定理是数学中的一个重要定理,凡·奥贝尔(
)是19世纪的一位德国数学家和工程师,他在数学和工程领域做出了多项贡献.其中,他提出了一个关于四边形和正方形的定理,即凡·奥贝尔定理.该定理指出,在任意一个四边形中,如果在其边外侧构造一个正方形,并将相对的正方形的中心连起,那么这两条线段将相等且互相垂直.如图1,以四边形
的边为边向外作四个正方形,四边形
,四边形
,四边形
,四边形
,
与
相交于点R,
与
相交于点N,其中心分别为
,连接
相交于点P,证明:
.
证明过程如下:
连接
,取
的中点M,连接
,
四边形
,四边形
是正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4c03ac696b191d126d6b132e0c90c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff2fc3ba6d7be43f7671e82b63ba804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f3e808b4bfc547d0d12c48de35bac8.png)
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad3b3c475c17284960f06d8cabc1a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce4b1cedfe1c9185649c5f3fff306d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d261c4c1c07e98549d37b86b33e7e4d4.png)
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1220ede200807d00ea98cfaaaa77f6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1ed1b2babf31b5c17f8ea9ec8080e4.png)
为
的中点,M为
的中点
(依据①)
同理![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddaabf0e291e9efa5d0012eedd3c9572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aff148fdad97d3ba3e225aa26df1f08.png)
同理可得:____________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dd4ab270bd906f7632f9cf6f437964.png)
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f5f7bd27e76524de14ba22182eb696.png)
……
(2)按照上面的思路,完成该定理的证明的剩余部分
(3)已知
,分别
,
,
为边向外作正方形
,
,
,点
分别是正方形
,
,
的对角线交点,连接
其中
,则四边形
的面积为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff9c41edc7935a8123841760cd4f1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea61ea3f3cf0e3001a5094960e9dc11f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca26dc1e9f90310e08150d5783e7e85f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593e424d96f343e77e0c3cec6e84cb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97607f6947b43d1847bb9db1b1c59615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97607f6947b43d1847bb9db1b1c59615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2218a80f8c5c7880090aafb28c760a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1deff46dc9e1c3e23425b6c12d15c4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6694610539184a9f651ff6623df8af8.png)
证明过程如下:
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd16f20bf90e92d19233cc17d0a51dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593e424d96f343e77e0c3cec6e84cb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4c03ac696b191d126d6b132e0c90c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff2fc3ba6d7be43f7671e82b63ba804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f3e808b4bfc547d0d12c48de35bac8.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adf6b0baefbfee5e95031bf45b4c384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592849d99e570c23906687097b1072ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad3b3c475c17284960f06d8cabc1a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce4b1cedfe1c9185649c5f3fff306d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d261c4c1c07e98549d37b86b33e7e4d4.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7900f73cd8362506f6b5575e1630f19e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b67a52161d2d254d84bd5e6c15092a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1220ede200807d00ea98cfaaaa77f6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1ed1b2babf31b5c17f8ea9ec8080e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5495a560dda56c5727157c6044d0f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38113a856f2b1f61581a16d52f03303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3a6e80700975a96ae8c381a17856b9.png)
同理
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddaabf0e291e9efa5d0012eedd3c9572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aff148fdad97d3ba3e225aa26df1f08.png)
同理可得:____________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dd4ab270bd906f7632f9cf6f437964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a12522642eb592215a5d0bf1419cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f5f7bd27e76524de14ba22182eb696.png)
……
(2)按照上面的思路,完成该定理的证明的剩余部分
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0da522aef3c452767df89b8d0eb62de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bf4f4d7ba01c1d6f7ecf75d4fd3129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fd4dfee3258dc4e386330bac4ef0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0da522aef3c452767df89b8d0eb62de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bf4f4d7ba01c1d6f7ecf75d4fd3129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430fa053e134f78498bbb90fd34222ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e9ecc7d7615d7fd72b7d071f008a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c70ad35e24ec145da3f7be97dcb25d.png)
您最近一年使用:0次
名校
6 . 在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f134aa1be35e4a34bfbe0c91041dbdcb.png)
,
平分
,点
是段
上的动点(不与
重合)
(1)如图,若
,求证:
.
是线段
延长线上的一点,且
,
求证:
是
的中点;
将线段
绕点
顺时针旋转
得到线段
,连接
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f134aa1be35e4a34bfbe0c91041dbdcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1dbc8b02dd480356e660bae5062f611.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757942f619e1f8d5296438829fb11b34.png)
(1)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea542c31170157c0e9b9e8b65a95437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865a2b6724b6145e905b28e9347a0fdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72be6f60235e83f4986ba6b1e24070d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8dd0c52aca1675c17b9a019aa7901e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90437e377c45b3371d3facf53175a917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00d5956c12160e00aa4ae535fcd641a.png)
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7 . 【课本再现】“直角三角形斜边上的中线等于斜边的一半”是直角三角形的一条重要性质定理.如图1,在
中,
,点D是
的中点.求证:
.
下面是两位同学两种添加辅助线的方法:
小明:如图2,延长
至点E,使
,连接
;
小华:如图3,取
的中点E,连接
;
(1)请你选择其中一位同学的方法完成证明,聪明的你也可以利用图1用其他方法完成证明.
中,
是高,求证:B,C,D,E四点共圆.
【拓展提升】(3)如图5,在五边形
中,
,
,F为
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
下面是两位同学两种添加辅助线的方法:
小明:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba87bb6ab3a88f6d9529e01ce585a5d.png)
小华:如图3,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)请你选择其中一位同学的方法完成证明,聪明的你也可以利用图1用其他方法完成证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
【拓展提升】(3)如图5,在五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766ae8acaddb28f8a5a55eff086fd976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd34a9d150aff3aa789230d7772384a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193ea44749f1c64c8723e84a57d15cb9.png)
您最近一年使用:0次
名校
8 . 如图,已知
中,
,
,点
为线段
上一点,连接
,作射线
使得
.过点
作
的垂线交
于点
,连接
,取
中点
,连接
,
.
(2)求证:
;
(3)①判断
的形状,并证明.
②直接写出
的大小(用
表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360b6eee26910171fe2ed85304624df6.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777a7d1ad6e522357e2a282fc2e120d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9d2319c434c7d3dc34e85bc2220d9c.png)
(3)①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9f0296c53918018745f4e3906e2dd8.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e265894011c2b93ce5a5fa9fab2b9982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2024-06-01更新
|
360次组卷
|
2卷引用:2024年北京师范大学附属实验中学中考零模数学试题
9 . 将图形特殊化是发现结论和探索方法的重要途径.
如图,在
中,
是中线,
是
边上一点,
,作
的垂直平分线分别交
于点
,探究下列问题.
(1)当点
与点
重合时,
①在图中,画出此特殊情形的图;
②此情形下,点
与点 重合,此时
与
满足的数量关系为 .
与点
重合时,在图中,用尺规作出点
的位置;(保留作图痕迹,写出必要的文字说明)
(3)当点
中,任意两点不重合时,如图,判断(1)问中
与
所满足的数量关系在此情形下是否仍然成立?说明理由.
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341776bb9bac744a986afe4e229bb426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a0610d74da218154a7745619529101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5298af91e06d2bf13e279c959cc5ca1a.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①在图中,画出此特殊情形的图;
②此情形下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4483ef97bc668fc907d835c29165b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
10 . 【背景】如图(1),点E,F分别是正方形
的边
的中点,
与
相交于点P,连接
.同学们在研究图形时,作
交CE于点H,发现:
.他们通过作三角形的中位线,构造全等三角形,找到与线段
相等的线段,得到了多种方法证明
成立.
【猜想】(1)若把正方形
改成平行四边形
,其余条件不变,如图(2),结论
是否还成立?请说明理由.
【延伸】(2)在图(2)的条件下连接
,那么四边形
的面积和
的面积有什么关系?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea77ba313fcc751481ac1ca214df3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68be2cafe8eb8d9a520d46449852a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4c680d6f8e5409f73f3955b679e81c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4c680d6f8e5409f73f3955b679e81c.png)
【猜想】(1)若把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4c680d6f8e5409f73f3955b679e81c.png)
【延伸】(2)在图(2)的条件下连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b452ab882ca7a4c5aac857dc1198f70a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3a4638e2eb4e684b73416fb6a0f344.png)
您最近一年使用:0次