如图,
是
的中线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/962ab99b-0d54-4489-b2ab-5312c65e1005.png?resizew=358)
(1)如图1,若点
恰好在
的垂直平分线上,求
的度数;
(2)如图2,若
,过点
作
,垂足为点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/962ab99b-0d54-4489-b2ab-5312c65e1005.png?resizew=358)
(1)如图1,若点
![](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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428cbc6084b4376adbdcac051ca8a403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de85d090481d6b0977e2e5750f243971.png)
23-24八年级上·湖北武汉·阶段练习 查看更多[2]
湖北省武汉市七一华源中学2023-2024学年八年级上学期月考数学试题(已下线)专题9.34 三角形的中位线(分层练习)(提升练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(苏科版)
更新时间:2024-01-15 16:18:21
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解答题-证明题
|
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名校
【推荐1】如图所示,在直角梯形ABCD中,∠ABC=90°,AD∥BC,AB=BC,E是AB的中点,CE⊥BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/25e011ba-61b8-40df-85dd-70ace2362a4f.png?resizew=167)
(1)求证:BE=AD;
(2)求证:AC是线段ED的垂直平分线;
(3)△DBC是等腰三角形吗?并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/25e011ba-61b8-40df-85dd-70ace2362a4f.png?resizew=167)
(1)求证:BE=AD;
(2)求证:AC是线段ED的垂直平分线;
(3)△DBC是等腰三角形吗?并说明理由.
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解答题-作图题
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【推荐2】如图,已知
.
(1)用尺规完成以下基本作图:作出线段
的垂直平分线
,垂足为点
,其中
交
于点
,交
于点
(保留作图痕迹,不写作法);
(2)在(1)所作的图形中,连接
、
,请证明四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550b15375a54ce849585b60bc42d2dd1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/b4eea4cc-799f-4d4c-a22a-b13522478eca.png?resizew=128)
(1)用尺规完成以下基本作图:作出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)在(1)所作的图形中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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【推荐1】如图,
和
都是等腰直角三角形,
,
,
连接
并延长与
交与点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/4f10236c-6efc-4753-99a7-b2d07db4a5e3.png?resizew=550)
(1)如图1,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)如图2,
绕着顶点
旋转,当
、
、
三点共线时,取
的中点
,连接
,求证:
;
(3)如图3,若
,
,连接
,当
运动到使得
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b821f17d332ffa4cbf339234d98e7bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a539a0930da7556594dd365878402d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/4f10236c-6efc-4753-99a7-b2d07db4a5e3.png?resizew=550)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd4ece5ac8c3f01435b0f6046783fe8.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc6b495628fad44806309583b7eef16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd91cf35ccc166078d0fe077e3e6809e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b53584b40ef87c7ee6dc73cb24de858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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【推荐2】如图,在四边形
中,
,
,
,点E为
上一点,连接
,
交于点F,
.
的形状,并说明理由;
(2)若
,
,则
的长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/126fdae0b1adc7361f945187b861fb20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002767b8780fc8bf7aafc7beb2bae1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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解答题-证明题
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【推荐1】如图,等边三角形ABC的边长为
,D,E分别为AB,AC的中点,延长BC至点F,使
,连接CD,EF,DE,.
(1)求证:DE=CF;
(2)求EF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3677b2682fb3572f6f3ae7b7d8ad1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/7f759d60-557c-433a-a844-a152bd3b4d1a.png?resizew=121)
(1)求证:DE=CF;
(2)求EF的长.
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解答题-证明题
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【推荐2】如图,平行四边形
的对角线
交于点O,E为
的中点.连接
并延长至点F,使得
,连接
.
为平行四边形;
(2)当
满足什么条件时,四边形
为矩形,证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d386acec19472657e4aa711ee8652b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75767b8b80cc1461a1addf2d308883c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75767b8b80cc1461a1addf2d308883c.png)
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【推荐1】如图,∠ABC=∠ADC=90°,E是AC的中点,连结BD,DE,BE,EF⊥BD于点F. 求证:DF=FB.
![](https://img.xkw.com/dksih/QBM/2018/10/26/2061857400315904/2062552673738752/STEM/4760069df75f428a9db73127c912e2f8.png?resizew=112)
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【推荐2】定义:如果三角形有一边上的中线长恰好等于这边的长,那么称这个三角形为“奇异三角形”,这条中线为“奇异中线”.
(1)判断:命题“如果直角三角形是奇异三角形,那么奇异中线一定是较长直角边上的中线”是真命题还是假命题.
(2)如图,在
中,
,
,
,求证:
是“奇异三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/fe240732-9291-4fa8-8591-432c18d170f4.png?resizew=154)
(3)已知等腰
是“奇异三角形”,
,求底边
的长.
(1)判断:命题“如果直角三角形是奇异三角形,那么奇异中线一定是较长直角边上的中线”是真命题还是假命题.
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/fe240732-9291-4fa8-8591-432c18d170f4.png?resizew=154)
(3)已知等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0896521d46a6b47c995c58959bc1041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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