已知:如图,在△ABC中,AD是边BC上的高,CE是边AB上的中线,G是CE的中点,DG⊥CE 于点G,求证:∠B=2∠BCE
![](https://img.xkw.com/dksih/QBM/2020/1/1/2367783233511424/2368385685397505/STEM/6e7d439c13ef4d738c85cfc6fcfa7368.png?resizew=191)
更新时间:2020-01-02 13:55:55
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在四边形
中,
,
,
cm,
cm,
,点P从点A出发沿
方向匀速运动,速度为2cm/s;同时,点Q从点C出发沿
方向匀速运动,速度为1cm/s,连接
、
、
.若设运动时间为t(s)(
).
时,求t的值;
(2)设
的面积为S,求S关于t的函数关系式;
(3)是否存在某一时刻t,使得点B在线段
的垂直平分线上?若存在,请求t的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bdee7807edba89958c84bf4bb85f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb4337e61fdb8a9e216273edab4579c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7c09761d62dab1f921f9abf24aad6a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
(3)是否存在某一时刻t,使得点B在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
的正方形网格中,点
,
,
均在格点上,请用无刻度直尺按要求画图.
为顶点作
,使
;
(2)在图2中,找一格点
以点
为顶点作
,使
;
(3)在图3中,在
上找一点
,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab5e8b6478c39564efa49162ee0bc14.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bd06fe6c593497916181bf13a5fd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad7d44f333a681b5429a2673307cb3d.png)
(2)在图2中,找一格点
![](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/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8008d0e7cb7e780a028e3c286a300613.png)
(3)在图3中,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0435f724a67b42436680115721cc3f1d.png)
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解答题-问答题
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名校
【推荐1】如图,已知
中,AB=AC=10 cm,BC=8cm,点D是AB的中点,点E在AC上,AE=6 cm,点P在BC上以1 cm/s速度由B点向C点运动,点Q在AC上由A点向E点运动,两点同时出发,当其中一点到达终点时,两点同时停止运动.
![](https://img.xkw.com/dksih/QBM/2019/11/7/2328767088001024/2329624742215680/STEM/0e3d625f4d40498d8a024816631a0165.png?resizew=118)
(1)在运动过程中,若点Q速度为2 cm/s,则
能否形成以
为顶角的等腰三角形?若可以,请求出运动时间t, 若不可以,请说明理由;
(2)当点Q速度为多少时,能够使
与
全等?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2019/11/7/2328767088001024/2329624742215680/STEM/0e3d625f4d40498d8a024816631a0165.png?resizew=118)
(1)在运动过程中,若点Q速度为2 cm/s,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39097a7389d65e9bcdf0b4009252f9b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdabf82afdf39eb51a09420751afb334.png)
(2)当点Q速度为多少时,能够使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d7afb771b2ada6a98f6ae93baa76a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28216af979e322f8ba68a24f42391a55.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的直径,
是
的弦,点F是
延长线上的一点,过
上一点C作
的切线交
于点E,
平分
.
![](https://img.xkw.com/dksih/QBM/2021/3/18/2680614266150912/2684799478947840/STEM/836b138e70254ec2b872cc27798b3d83.png?resizew=229)
(1)求证:
;
(2)若
,求
的半径.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edabae47b9b9df627aaa281ca0f4e71a.png)
![](https://img.xkw.com/dksih/QBM/2021/3/18/2680614266150912/2684799478947840/STEM/836b138e70254ec2b872cc27798b3d83.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783b84ed8d927b77491092f7d2ee2989.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f46ad5be2b1eb770bd085e5659a53dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,已知
中,
,求作
的垂直平分线
,分别交
于
两点;连接
,求出
的长.(要求:尺规作图,保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ebd222cefbcd5ce44d3789865f68d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79117d7c1b3e654693266b280a44a76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2018/6/4/1960053193629696/1960606249484288/STEM/ec163c40949347cebccb738bf5cb99aa.png?resizew=209)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,点D是
的中点,以
为直径作
,
分别与
交于点E,F,过点F作
的切线
,交
于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/b5f08181-3f34-4507-9a67-66dfc36644ca.png?resizew=160)
(1)求证:
;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b999c65afd2fdb04988383da76f4bc.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/b5f08181-3f34-4507-9a67-66dfc36644ca.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe607487a859b4a7315adff4703d1902.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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