已知:
中,
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639634309447680/2653150190379008/STEM/afe22c147f0d4ffc94c602089c62f8f0.png?resizew=447)
(1)如图1,
,
,垂足分别为
、
,求证:
;
(2)若
,点
在
的延长线上,且
,
①如图2,若点
恰好在
上,求证:
;
②如图3,若点
在
的延长线上,
,
,直接写出
的长______.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639634309447680/2653150190379008/STEM/afe22c147f0d4ffc94c602089c62f8f0.png?resizew=447)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.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/7faabc484ce3666706c1beffda4bcfe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ca0f2b2b40440365fcce22ac32c0ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e408a05c641aa384fdd51f7b10cfda.png)
①如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
②如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
更新时间:2021-02-07 21:50:47
|
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解答题-问答题
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适中
(0.65)
名校
【推荐1】如图,
中,
,点E是
的中点,若
平分
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知:如图,已知,点B,E,C,F在一条直线上,
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadd3b0db9263dee69c1c4ca20ed1cb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e570eabbf1b9390fe78cbb37995c60f8.png)
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解答题-问答题
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适中
(0.65)
【推荐1】已知
中,
,
,点P为射线AD上任意一点(点P与点A不重合).连接CP,将线段CP绕点C顺时针旋转60°得到线段CQ,连接QB并延长交直线AD于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/19e1705f-0abe-4013-a425-2ac3bab16767.png?resizew=241)
(1)如图1,当
时,试猜想BC与QE的位置关系,并说明理由;
(2)如图2,当
,
时,点E恰好与点A重合,若
,求BQ的长.
![](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/e075468e7fb0bf30229aec01a7205977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/19e1705f-0abe-4013-a425-2ac3bab16767.png?resizew=241)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b922c7fc50a56933a6cb9d80b1e7bb6c.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b2e60ca7d6ace337e3f066b60830e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2143fad9cec2734123b2e453756279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
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解答题-证明题
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适中
(0.65)
【推荐2】给出一个新定义:有两个等腰三角形,如果它们的顶角相等、顶角顶点互相重合且其中一个等腰三角形的一个底角顶点在另一个等腰三角形的底边上,那么这两个等腰三角形互为“友好三角形”.
和
互为“友好三角形”,点D是
边上一点(不与点B重合),
,
,
,连接
,则
________
(填“<”或“=”或“>”),
________°;
(2)如图②,
和
互为“友好三角形”,点D是
边上一点,
,
,
,M、N分别是底边
的中点,请探究
与
的数量关系,并说明理由;
(3)如图③,
和
互为“友好三角形”,点D是
边上一动点,
,
,
,M、N分别是底边
的中点,请直接写出
与
的数量关系(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a888af84a973afcc566759428cf8ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b753dbb5a670dd4f5e23bb919e44dda2.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d959ad0bf10a92c6c6be067f7094fcb8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在Rt△ABC中,∠C=90°,AC=8cm,BC=6CM.点P,Q同时由B,A两点出发,分别沿射线BC,AC方向以1cm/s的速度匀速运动.
![](https://img.xkw.com/dksih/QBM/2015/3/20/1573815131881472/1573815138222080/STEM/e9049e465be74ac983f8b66d8d9e9518.png)
(1)几秒后△PCQ的面积是△ABC面积的一半?
(2)连结BQ,几秒后△BPQ是等腰三角形?
![](https://img.xkw.com/dksih/QBM/2015/3/20/1573815131881472/1573815138222080/STEM/e9049e465be74ac983f8b66d8d9e9518.png)
(1)几秒后△PCQ的面积是△ABC面积的一半?
(2)连结BQ,几秒后△BPQ是等腰三角形?
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【推荐2】已知AB是⊙O的直径,弦CD与AB相交于点E,过点C作⊙O的切线,与BA的延长线交于点P,∠BPC=38°.
![](https://img.xkw.com/dksih/QBM/2022/3/7/2930902935740416/2936761982132224/STEM/ada79a09e3e741238a1af680a5f84c65.png?resizew=388)
(1)如图①,连接OD,若D为
的中点,求∠ODC的大小;
(2)如图②,连接BD,若DE=DB,求∠PBD的大小.
![](https://img.xkw.com/dksih/QBM/2022/3/7/2930902935740416/2936761982132224/STEM/ada79a09e3e741238a1af680a5f84c65.png?resizew=388)
(1)如图①,连接OD,若D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(2)如图②,连接BD,若DE=DB,求∠PBD的大小.
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