设
,
,
是
的三条中线,求证:
,
,
三线共点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e20c8b220bd1a725a8e7a592de187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b1e4aa15efd79404d3bea964db0f7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79124826b21bb658c4f44a976a4929d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e20c8b220bd1a725a8e7a592de187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b1e4aa15efd79404d3bea964db0f7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79124826b21bb658c4f44a976a4929d7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/0de77090-105c-4310-bb50-a68870a9895f.png?resizew=179)
更新时间:2023-06-08 15:57:14
|
相似题推荐
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,点C是以AB为直径的半圆O内任意一点,连接AC,BC,点D在AC上,且AD=CD,请仅用无刻度的直尺分别按下列要求画图(保留画图痕迹).
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982041277718528/2985113331523584/STEM/81a69e2e-34af-4a37-9645-fc28a07a6f92.png?resizew=390)
(1)在图(1)中,画出
的中线AE;
(2)在图(2)中,画出
的角平分线AF.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982041277718528/2985113331523584/STEM/81a69e2e-34af-4a37-9645-fc28a07a6f92.png?resizew=390)
(1)在图(1)中,画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)在图(2)中,画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】以下各图均是由边长为1的小正方形组成的3×3网格,
的顶点均在格点上,利用网格和无刻度的直尺作图,保留痕迹,不写作法.
![](https://img.xkw.com/dksih/QBM/2020/12/26/2629518313578496/2635351372832768/STEM/713ca6c2-cea1-4841-9859-a5c08144fb95.png)
(1)
ABC的面积为________.
(2)在图①中,作出
的重心O.
(3)在图②中,在
的边AC上找一点F,连结BF,使
的面积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2020/12/26/2629518313578496/2635351372832768/STEM/713ca6c2-cea1-4841-9859-a5c08144fb95.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)在图①中,作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在图②中,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的外接圆,分别过A,C作
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/d4a99517-2f9d-4444-9abc-c5b3234fa621.png?resizew=185)
(1)求证:
;
(2)若
.
①求证:
是
的切线;
②已知
,当四边形
的某条边所在直线过圆心O时,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/d4a99517-2f9d-4444-9abc-c5b3234fa621.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】在△ABC 中,∠BAC=90°,AB<AC,M 是 BC 边的中点,MN⊥BC交 AC 于点 N,动点 P 在线段 BA 上以每秒
cm 的速度由点 B 向点 A 运动.同时, 动点 Q 在线段 AC 上由点 N 向点 C 运动,且始终保持 MQ⊥MP. 一个点到终点时,两个点同时停止运动.设运动时间为 t 秒(t>0).
(1)△PBM 与△QNM 相似吗?请说明理由;
(2)若∠ABC=60°,AB=4
cm.
①求动点 Q 的运动速度;
②设△APQ 的面积为 s(cm2),求 S 与 t 的函数关系式.(不必写出 t 的取值范围)
(3)探求 BP²、PQ²、CQ² 三者之间的数量关系,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)△PBM 与△QNM 相似吗?请说明理由;
(2)若∠ABC=60°,AB=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
①求动点 Q 的运动速度;
②设△APQ 的面积为 s(cm2),求 S 与 t 的函数关系式.(不必写出 t 的取值范围)
(3)探求 BP²、PQ²、CQ² 三者之间的数量关系,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/8/4/2261438056529920/2262097804001280/STEM/6c920b94d1e24619b2a8b3fc920c67c7.png?resizew=205)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】回归课本,完成证明
三角形中位线定理:三角形的中位线平行于第三边且等于第三边的一半.
已知:如图,在
中,点D、E分别是
、
边的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/9938a2e1-a4f4-4921-aaf1-7d8917eac352.png?resizew=202)
(1)求证:______________
(2)证明:延长
至点F,使得
,连接
.
三角形中位线定理:三角形的中位线平行于第三边且等于第三边的一半.
已知:如图,在
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/9938a2e1-a4f4-4921-aaf1-7d8917eac352.png?resizew=202)
(1)求证:______________
(2)证明:延长
![](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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
的中线
,
相交于点G,已知点P,Q分别是
,
的中点.
是平行四边形;
(2)若
,请判断
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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8552ad9af3f75f11ec1d2aae32147fc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e4725a151f841e9056d3811003bbfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,正方形
的边长为4,点E在边
上,
,连接
交
于点F,过点F作
,交
于点G.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a32ff42fed45ae870a688fb7103fa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/67099280-5aad-4eb6-b977-edec094eddda.png?resizew=124)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,已知
,
,
为射线
上两点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/8a48afa2-d925-45d4-ab86-2ebd89ec973d.png?resizew=180)
(1)求作菱形
,使得点
在射线
上(尺规作图,保留作图痕迹,不写作法);
(2)连接
,
交于点
,
交
于
在(1)的条件下,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcba110804ba8bcfdc4a613b3703498.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/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d770538fd05ed8bb8a7d17df10e9e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/8a48afa2-d925-45d4-ab86-2ebd89ec973d.png?resizew=180)
(1)求作菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.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/fedae548cfe15a9a7f49eaeaafd161bf.png)
您最近一年使用:0次