在平行四边形
中,
,
,∠BAD=120°.
,则
______;
(2)如图
,求对角线
的长(用含
,
的式子表示);
(3)如图
,四边形
也是平行四边形,连结
并延长交
于点
,若AG⊥BE,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668c8ab5abdba7173bcbe573ae87dad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
22-23八年级下·浙江·期中 查看更多[5]
浙江省六校联考2022-2023学年八年级下学期期中考试数学试题(已下线)专题18.4 平行四边形(分层练习)(培优练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(人教版)(已下线)专题03 平行四边形的性质和判定之八大题型-【好题汇编】备战2023-2024学年八年级数学下学期期中真题分类汇编(人教版)(已下线)专题04 平行四边形与菱形(考点清单+20种题型解读)-2023-2024学年八年级数学下学期期中考点大串讲(苏科版)(已下线)第20讲 二次根式的加减(3大考点+11种题型+强化训练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(苏科版)
更新时间:2024-01-14 10:30:06
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解答题-问答题
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适中
(0.65)
【推荐2】已知a=
+1,b=
﹣1,求下列各式的值.
(1)a2﹣b2;
(2)a2﹣ab+b2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)a2﹣b2;
(2)a2﹣ab+b2.
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【推荐1】(1)【问题原型】如图①,在
,
,
,求点
到
的距离.
(2)【问题延伸】如图②,在
,
,
.若点
在边
上,点
在线段
上,连结
,过点
作
于
,则
的最小值为______.
(3)【问题拓展】如图(3),在矩形
中,
.点
在边
上,点
在边
上,点
在线段
上,连结
.若
,则
的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)【问题延伸】如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8563c09abcd5e110aa93d2f03d7363.png)
(3)【问题拓展】如图(3),在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f504cd6d53cbf28a697d0ed5caf8fe6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a3e8100280df38c41d74a90db59216.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/6e2a4569-0af0-4fb5-bee7-0f746896176b.png?resizew=447)
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【推荐2】如图,已知
是等边三角形,D,E分别为
上的点,且
,
相交于点P,
于点Q,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa49835cb36d11ba406fa8cabbecd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8fb32ae05a9c1abd3374f5c5f7a999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba83afe4ade6624b283331a18bdf2ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77f2b19c52a8ef7d6d0cbdc43da861d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7af4d98f8cedc34f5fe160dd8df2c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/b2fa82bd-d4ba-411a-839f-6431a78551ba.png?resizew=161)
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【推荐1】如图所示,
中,
,
,
.点
从点
开始沿
边向
以
的速度移动,点
从
点开始沿
边向点
以
的速度移动,
,
分别从
,
同时出发,经过几秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/a40ffca1-0446-4c10-bd30-86acfb93fd4d.png?resizew=154)
(1)
.
(2)
的面积等于
?
(3)点
,
之间的距离是否可以为
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/a40ffca1-0446-4c10-bd30-86acfb93fd4d.png?resizew=154)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2952c1bb3373bd9cb2b8c59c8ec55f4b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79315ea6cf5640e036fc98332ad9ff7a.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3beaec0a7aaef57fb69536924756c017.png)
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名校
【推荐2】如图,
是
的半径
上的一点(不与端点重合),过点
作
的垂线交
于点
,
,连接
.
是
上一点,
,过点
作
的切线
,连接
并延长交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2023/12/29/3399606544850944/3400521591750656/STEM/3bd9079a52c74a0bb259a5c71ffff3d8.png?resizew=261)
(1)①依题意补全图形;
②求证:
;
(2)连接
,若
是
的中点,
的半径是4,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e06b894d63543a5144e77dd79f43430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/12/29/3399606544850944/3400521591750656/STEM/3bd9079a52c74a0bb259a5c71ffff3d8.png?resizew=261)
(1)①依题意补全图形;
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c88ca544679dd85d2afed3f0c31c3c8.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
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【推荐1】如图,在平行四边形ABCD中,E,F为对角线BD上的两点,且∠DAE=∠BCF.
求证:(1)AE=CF;
(2)四边形AECF是平行四边形.
求证:(1)AE=CF;
(2)四边形AECF是平行四边形.
![](https://img.xkw.com/dksih/QBM/2020/3/13/2418862073634816/2419292911288320/STEM/259d4bb6910847abbb52bb7c02130b98.png?resizew=165)
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【推荐2】瑞士数学家菜昂哈德•欧拉(LeonhardEuler)是18世纪数学界最杰出的人物之一.欧拉于1765年在他的著作《三角形的几何学》中提出“欧拉线定理”:任意三角形的外心、重心、垂心依次位于同一条直线上,这条直线就叫该三角形的欧拉线.
【定理证明】
已知:如图所示,在△ABC中,点G,O,H分别是△ABC的重心、外心、垂心.
求证:G,O,H三点共线.
证明:作△ABC的外接圆,连接OB,并延长BO交外接圆于点D;作中线AM;连接AD,CD,AH,CH,OH,OM;设AM交OH于点G′.
…
(1)请你按照辅助线的语言表述,补全图,并继续完成欧拉线定理的证明.
【基础运用】
(2)在【定理证明】的基础上,判断OH与OG的数量关系,并说明理由.
【能力提升】
(3)在平面直角坐标系中,已知△ABC的三个顶点A(0,0),B(4,0),C(3,
),请直接写出△ABC的欧拉线的函数解析式.
【定理证明】
已知:如图所示,在△ABC中,点G,O,H分别是△ABC的重心、外心、垂心.
求证:G,O,H三点共线.
证明:作△ABC的外接圆,连接OB,并延长BO交外接圆于点D;作中线AM;连接AD,CD,AH,CH,OH,OM;设AM交OH于点G′.
…
(1)请你按照辅助线的语言表述,补全图,并继续完成欧拉线定理的证明.
【基础运用】
(2)在【定理证明】的基础上,判断OH与OG的数量关系,并说明理由.
【能力提升】
(3)在平面直角坐标系中,已知△ABC的三个顶点A(0,0),B(4,0),C(3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2021/4/10/2696580939497472/2697441524989952/STEM/654f3c8927e84b549673f926cd17b259.png?resizew=143)
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