1 . 【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:
您最近一年使用:0次
2 . 【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)
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3 . 定义:我们把对角线相等的四边形叫作伪矩形,对角线的交点称作伪矩形的中心.
(1)①写出一种你学过的伪矩形: .
②顺次连接伪矩形各边中点所得的四边形是 .
A.正方形 B.矩形 C.菱形 D.无法确定
(2)如图1,在伪矩形
中,
,
,
,求
的长.
中,
,
,
,
,求这个伪矩形的面积.
(1)①写出一种你学过的伪矩形: .
②顺次连接伪矩形各边中点所得的四边形是 .
A.正方形 B.矩形 C.菱形 D.无法确定
(2)如图1,在伪矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
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2024-05-11更新
|
210次组卷
|
2卷引用:2024年浙江省浙里初中升学联考仿真卷(二)数学模拟预测题
4 . 学习了“三角形中位线定理”后,在“
中,D,E分别是边
上的点”这个前提条件下,某同学得到以下3个结论:
①若D是
的中点,
,则E是
的中点.
②若D是
的中点,
,则E是
的中点.
③若
,
,则D,E分别是
的中点.
其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
①若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
其中正确的是( )
A.①② | B.①③ | C.②③ | D.①②③ |
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5 . 探究背景:学习了《三角形的中位线》后,某探究小组继续应用中位线定理探究三角形如图1,在
中,延长
至点D,使得
,点E,F,G是
的中点.
是平行四边形;
(2)若
,连结
,尝试探究
与
的数量关系,并根据图1说明理由;
(3)如图2,若
,探究
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffc2a946e72f26a8af584d8ead3a396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5262192e49cf903ee094457dbc250f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257f9e2bcb45de86eab83d3bab6877fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c030c01354a2dfa0d848ec4cda9863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269126dce7e64dfc6e9b5ad28717c782.png)
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6 . 如图,点C在以
为直径的
上.将
沿直径
对折,点C落在
上的点D处,分别连接
,
,
,
与
交于点E.另有一动点F在
上运动,连接
交
于点G,交
于点H.
平分
时.
①连结
,求证:
.
②若
,求
的值.
(2)当
时,探究线段
与
的长度关系.
(3)如图2,若点F运动到
上,
交
于点I,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
①连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600a147b2982b20603e97ecf908ce01c.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6add98ef5f7d75ac89f846ab38f58f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d7b85a2c642e8019d081ab8faa17c71.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(3)如图2,若点F运动到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997e259b8e338efec1d972717a483eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95fad373592cf3b967e077671e55bf9d.png)
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7 . 【基础巩固】(1)如图1,在
中,
,D为
上一点,
,
.求证:
.
【尝试应用】(2)如图2,在(1)的条件下,
交
于点F.若
,
.求
的值.
【拓展延伸】(3)如图3,在(1)的条件下,若
,M,N分别是
,
的中点,请直接写出
周长的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc2450dc300ce26b513c2abae28cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8403902de9e7e6e428e25b8a24126e.png)
【尝试应用】(2)如图2,在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ca5cf8bf873b1a42389169fd8a560f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7ba0b6dbb952be352d73c1502e290e.png)
【拓展延伸】(3)如图3,在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45abb6e07f693fb471db5032b7a41206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/60db16b6-1fbd-4ec3-8d6c-5676ca76b2f2.png?resizew=530)
您最近一年使用:0次
名校
8 . 已知四边形
内接于
(
),对角线
于点M,点N为线段
上一点,且
.
恰好经过圆心O,证明:
.
(2)如图2,若
不经过圆心O,
是否成立,请说明理由.
(3)在(2)的条件下,如图3所示,线段
与
交于点G,延长
交
于点F,连结
,若
,
,设
,
,请直接写出
的长(用x,y表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1561853725e205f7c2c4bfff968814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84757ce6c1f91aa44edc5a69cf0516a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f1b040e95ecc3fa804433de5b449dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5caadcd6d211df3a636f03d8b75ff7.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5caadcd6d211df3a636f03d8b75ff7.png)
(3)在(2)的条件下,如图3所示,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6f92bb1a03aec522a1e456259ea56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac11e6ced49b157ac59dea1035ac7a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b704e70d22c666892b05945271e412d.png)
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2024-01-28更新
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2卷引用:浙江省浙派·振兴联盟2023-2024学年九年级上学期期末数学试题
9 . 如图所示,
为
的直径,点C、D为
上任意两点,连结
、
、
、
,且
与
交于点E,若弧
等于弧
,则下列判断错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/69052c03-ff4b-4e0b-b801-3c29df2b3af3.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/69052c03-ff4b-4e0b-b801-3c29df2b3af3.png?resizew=137)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知,在
中,
,
,
于点H,交
于点G,E为
上一点,连接
交
于点F.
(1)如图1,若
于点E,
,
,求
的长;
(2)如图2,若
,
,求证:
;
(3)如图3,若E为
的中点,作A关于
的对称点
,连接
,
,
,请直接写出
,
,
之间的等量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d365cc7ce9022654091eee60bc1c2b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c334350df9be155b169fc3784b08532b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/44c090ea-8562-49fa-a525-1aaeab6ddeae.png?resizew=495)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea739ced77feb7524cc1b742ec0dc5fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aff006f6a11a47638279c09d67d45ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cdf48eb2e9414478ba58a57a0e4ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306f97131b08eed93890e6985ea4bb65.png)
(3)如图3,若E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eba8ef753df3569875282d12342c149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8049be7e7cd824771471bfac2bf70ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543c5d26f1e3d7d40a08a7b11149f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8ac25cd4b5b4489279e2160bc427cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b7a8e4c02f95e6d17ec2470a1141d6.png)
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