请用尺规按要求作图,如图,已知线段
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/38d00fe0-0af7-45cf-9b19-d9b6093a4335.png?resizew=128)
(1)作线段
,使
;若
为
的中点,点
为
的中点,请在图中表示出来.
(2)在(1)条件下,若
,
,求
.
(3)在(1)条件下,若
为
的中点,请求出
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/38d00fe0-0af7-45cf-9b19-d9b6093a4335.png?resizew=128)
(1)作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c569706c2a60e7491641da7ad7798733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)在(1)条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)在(1)条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2023-12-18 10:52:18
|
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解答题-作图题
|
适中
(0.65)
【推荐1】学习等腰三角形时,大家做过这样一道题目:如图,
平分
,求证:
.受这个题目的启发,丽丽想到了另一种用尺规作角平分线的方法
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/e6ab3d0a-4f52-4bbc-ac3c-5fb002ba9f8d.png?resizew=134)
(1)请你帮她完善下面作图步骤:
已知:如图,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:
的平分线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
作法:①在
上任取一点C;
②在
内作
,使
;
③在
上截取
;
④作射线
,射线
即为所求
(2)补全上面作图.(保留作图痕迹)
(3)为了说明这一方法的正确性,需要对其进行证明.下面给出了不完整的“已知”,请补充完整
已知:如图,C是
边
上任一点,
在
内,P是
上的点,且 = ,作射线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
求证:
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949ce35f974219764fced94166335503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/e6ab3d0a-4f52-4bbc-ac3c-5fb002ba9f8d.png?resizew=134)
(1)请你帮她完善下面作图步骤:
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
作法:①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22826ca948f901917dda3cebe33a08a1.png)
③在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc2ddabf078c1b683b067eb1aee1969.png)
④作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)补全上面作图.(保留作图痕迹)
(3)为了说明这一方法的正确性,需要对其进行证明.下面给出了不完整的“已知”,请补充完整
已知:如图,C是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/9a5ead1a-1394-444d-81bc-d940f533edf3.png?resizew=151)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,∠AOB=∠EOF=90°,连接AB.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896191886196736/2918538098630656/STEM/ef7ae579-7138-486f-bfde-bcc88b48043e.png?resizew=243)
(1)用尺规作图法在射线OF上作OC=OB,在射线OE上取点D使CD=AB;
(2)连接CD,找一点P使它到四边形OBCD四个顶点的距离之和最小,并说明理由;
(3)设∠AOF=α,
①当α=42°时,求∠BOE的大小;
②当∠AOB绕点O旋转任意角度时,请用α表示∠AOF和∠BOE之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896191886196736/2918538098630656/STEM/ef7ae579-7138-486f-bfde-bcc88b48043e.png?resizew=243)
(1)用尺规作图法在射线OF上作OC=OB,在射线OE上取点D使CD=AB;
(2)连接CD,找一点P使它到四边形OBCD四个顶点的距离之和最小,并说明理由;
(3)设∠AOF=α,
①当α=42°时,求∠BOE的大小;
②当∠AOB绕点O旋转任意角度时,请用α表示∠AOF和∠BOE之间的数量关系,并说明理由.
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适中
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【推荐1】已知点B在直线AC上,AB=4cm,AC=6cm.P、Q分别是AB、AC的中点,求线段PQ的长.
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名校
【推荐2】如图,已知线段
,
,点M是
的中点.
(1)求线段
的长;
(2)在
上取一点N,使得
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f732fce92dd33b28a254c2b1ae2261e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d032bd2ccb64e1b027dc06c42119a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/eea2dc49-2bc1-47b8-b5e4-cfbd8f7f3fc4.png?resizew=301)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6a5a4813d0f1d25a6b672a2e69dfe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,长度为
的线段
上有两点C、D,这两点将线段
分成
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/7e4159fb-89f9-4fbf-95bf-2a5676d9069f.png?resizew=350)
(1)求线段
的长;
(2)点M为线段
的中点,点N为线段
的中点,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ef0460d633ef5ea688ec100d56ec4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79158238ef2c940ad89a9b764f2191b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/7e4159fb-89f9-4fbf-95bf-2a5676d9069f.png?resizew=350)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)点M为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,直线l上有A、B两点,AB=15cm,点O是线段AB上的一点,OB=2OA.
(1)OA= cm,OB= cm.
(2)若点C是线段AB的中点,求线段CO的长.
(3)有两条射线OC、OD均从射线OA同时绕点O顺时针方向旋转,OC旋转的速度为5度/秒,OD旋转的速度为2度/秒,当OC与OD第一次重合时,OC、OD同时停止旋转,设旋转时间为t秒,当t为何值时,射线OC⊥OD.
(1)OA= cm,OB= cm.
(2)若点C是线段AB的中点,求线段CO的长.
(3)有两条射线OC、OD均从射线OA同时绕点O顺时针方向旋转,OC旋转的速度为5度/秒,OD旋转的速度为2度/秒,当OC与OD第一次重合时,OC、OD同时停止旋转,设旋转时间为t秒,当t为何值时,射线OC⊥OD.
![](https://img.xkw.com/dksih/QBM/2019/3/16/2161551203663872/2163301602607104/STEM/d1a32b5c4ed54d958357d3498bce9c6f.png?resizew=181)
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