名校
1 . 四边形
内接于
,
为
直径,对角线
平分
,对角线
、
相交于点
.
的值;
(2)若
,
的半径长为
,求
的长;
(3)设
、
、四边形
的面积分别为
、
、
.若
,令
半径为
,求
的值.(用含
的代数式表示)
![](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/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0e822d51f42b7159ffb435c693562.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6f9fdf06cfa5abbbfe840b40e606b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef7cd94eff5b9c5bb77538d30722d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bde380807790b7d731aa2aaa14f92d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
您最近一年使用:0次
2 . 如何拍出大长腿的效果?
【数学眼光】
如图①,低角度拍摄,并结合仰拍技巧,可以有效地拉长腿部线条.
(1)针孔相机的成像原理:如图②,由于光的直射,人的足部A与头部B通过小孔O的成像分别在
,
处,线段
的像是线段
,
上点C的像是点C′.若
,求证:
.
(2)如图③,小美站立在A处,摄影师给小美仰拍.小美的身高
的像为
,腿部
的像为
.
①试说明能拍出大长腿效果的理由;
②若
,
,则
.
【数学眼光】
如图①,低角度拍摄,并结合仰拍技巧,可以有效地拉长腿部线条.
(1)针孔相机的成像原理:如图②,由于光的直射,人的足部A与头部B通过小孔O的成像分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5847696d036c8df1e22a1ad721efaf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17939984337d28d7283bd6dd62d9e455.png)
(2)如图③,小美站立在A处,摄影师给小美仰拍.小美的身高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
①试说明能拍出大长腿效果的理由;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1b02d38475f4498763b5f9b7e72ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aee59824387d1d3eddb2325ad53f34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d6de05d7b83f1308ecc96ef4162320.png)
您最近一年使用:0次
2024九年级下·上海·专题练习
3 . 如图,在圆
中,弦
等于弦
,且相交于点
,其中
、
为
、
中点.
;
(2)连接
、
、
,若
,证明:四边形
为矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/dad2a36927223bd70f426ba06aea4b45.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4259b4381b359c92a63c4108a687c090.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/282c0f8f3ab25383155bf68499a3dcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4465a96d65de0f859ea4ec9e548204d7.png)
您最近一年使用:0次
名校
4 . 如图,在直角
中,
.点D为
内一点,且
,E为线段
的中点,连接
.
,
,求
的长;
(2)如图2,连接
,若
,
,过点E作
交于F,求证:
;
(3)如图3,过点D作
于点M,
于点N,连接
,若
,
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2166bb9a23c7ed545791eb6b5d66858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f6604f7b26f31baed2728580d618cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6f22c5ab218be9f0ad15d8464be9d1.png)
(3)如图3,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba870ac7e456d8daa098c9d52aeccc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b910d57a6bb68c737d85ced512464fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
5 . 如图1,
是
的中线,过
上一点
作
,分别与
的延长线和
相交于点
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/fd5e378d-b1ca-4f87-bfda-dca58de007a3.png?resizew=119)
(1)若
,求
的值;
(2)如图2,在
上取一点
,使得
,连接
并延长交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/65e521f2-8348-4013-9ee6-f477db4b716d.png?resizew=119)
①求证:
;
②连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b4e97618f0af8c34ce1e9439f57416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/fd5e378d-b1ca-4f87-bfda-dca58de007a3.png?resizew=119)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc6ce7c110ad2a876487e143042e2d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bb3810b6b55b567725a965de868e86.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80483a34c1afd9c916fae66afb9e0ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/65e521f2-8348-4013-9ee6-f477db4b716d.png?resizew=119)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9570dc956dba6ed6a701d8800d93eeb7.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f45f04e03c0de76773087ad3ab0c93.png)
您最近一年使用:0次
6 . 如图1和图2,在
中,
,
,点
在
上,且
,点
从点
出发沿折线
以每秒2个单位匀速运动,同时点
从点
出发以每秒1个单位向点A运动,连接
,其中一个点到达终点时,另一个点也随之停止运动.设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/1a8a5512-8e58-4c69-89e5-03f817ab2a0e.png?resizew=401)
(1)当点
在
上时,
______(用含
的代数式表示);
(2)当点
在
上运动时,
①点
与点A的最短距离为______,此时
的值为______;
②求出点
到直线
的距离(用含
的代数式表示);
(3)在整个运动过程中,当
与
的一边平行时,求出
的值;
(4)当点
在
上运动时,是否存在某一时刻,使得
,若存在,直接写出
的值,若不存在,请说明理由.
![](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/8f98e9c9cbdad60f42c7be2e38a07915.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/098a96d1e67d5e74d6122c8dfa63f183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8054b75d1c74d019bf7d9821a4a6a505.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/1a8a5512-8e58-4c69-89e5-03f817ab2a0e.png?resizew=401)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②求出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在整个运动过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23230b2f8bc0a86b5e997131079b9523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
7 . 如图① 所示,已知
是
的直径,点C在半径
上,点D,点F是圆上的点,
,点E是半径
的中点,
与
交于点G,连接
,
.
(1)如果
,连接OD,如图② 所示:
①则
的度数为___________°;
②若
,求线段
的长;
(2)若
,求
的值.
![](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/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29907a330c9ca9891b8cae361e23e23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/da85a7b6-037b-4b36-8b3d-f32a74cd6552.png?resizew=308)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846bbe6e9646cae074a24c0dffc6d8f3.png)
①则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d61a90e73734266363d08e2f1e119f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10aa73bad253eedf96f27103fe4ddf1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a794c783c5d5e2f9ed517df6609c91.png)
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名校
8 . 已知:
三个顶点都在
上,
是
的直径.
(1)如图1,求证:
.
(2)如图2,
和
交于点
,过
作
垂足为点
,若
时,求证:
.
(3)如图3,在(2)的条件下,延长
交
于点
,若
,
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/a64b4ad9-0517-47ea-8121-1441addfb052.png?resizew=412)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42927b323c373ced480983db4fce8f01.png)
(2)如图2,
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9f59fc71dbdb07f7b8eb6341d06c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd118a9fd721161376154ac44e37a7da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d00be47dcb89793f14a2fd10f4c522b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
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2023-10-16更新
|
127次组卷
|
2卷引用:黑龙江省哈尔滨市第十七中学2023-2024学年九年级上学期月考数学试题
9 . 下列说法中,正确的个数是( )
①若
,则
或
;
②相似三角形的中线的比等于相似比;
③如果一条直线截三角形两边的延长线所得的对应线段成比例,那么这条直线平行于三角形的第三边;
④有一边及这边上的高对应成比例的两个三角形面积之比等于这边比的平方;
⑤两条直线被三条直线所截,若截得的线段对应成比例,则这三条直线一定平行;
⑥邻边相等的两个矩形一定相似.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5088fe4cf465e8a696666ca569c24608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac9c54e9cc1b4e020e7dc96769e11f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb307e3dd8cfc8572f2edbe61f382d4.png)
②相似三角形的中线的比等于相似比;
③如果一条直线截三角形两边的延长线所得的对应线段成比例,那么这条直线平行于三角形的第三边;
④有一边及这边上的高对应成比例的两个三角形面积之比等于这边比的平方;
⑤两条直线被三条直线所截,若截得的线段对应成比例,则这三条直线一定平行;
⑥邻边相等的两个矩形一定相似.
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
10 . 如图,已知抛物线
与
轴交于
、
两点(
在
的左侧),与
轴交于点
,
,点
的坐标为
.
(1)求
、
、
的坐标及
的值;
(2)直线
经过点
,与抛物线交于
、
,若
,求直线
的解析式;
(3)过点
作直线
,
为直线
上的一动点.是否存在点
,使
的值最大?若存在,求出此时
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f79ed5a89f1e001a7c90673ab99d3ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed18bd80c6c4142f68e89f4ad44570b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/52b0fc04-3db7-4305-b7d1-ffc8ab008fac.png?resizew=352)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678029f3b70ae435727a581780ebcf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6829491c58392d883c74a0914bb1530d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b4e222f9537562cbff984d5b4e1c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b4e222f9537562cbff984d5b4e1c4b.png)
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