如图,在Rt△ABC中,∠ABC=90°,AB=3,BC=4,AD是∠BAC的平分线.
(1)尺规作图:过点D作DE⊥AC于E;
(2)求DE的长.
(1)尺规作图:过点D作DE⊥AC于E;
(2)求DE的长.
![](https://img.xkw.com/dksih/QBM/2017/10/14/1794933678587904/1795151943540737/STEM/0809e478bfdd43d49e53c1581bacc57a.png?resizew=106)
更新时间:2017-10-14 16:28:53
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解答题-作图题
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适中
(0.65)
【推荐1】作图题
![](https://img.xkw.com/dksih/QBM/2022/12/3/3123146209124352/3132955741609984/STEM/d29342ec81d04978bf1397f35b513c8b.png?resizew=183)
(1)在直线
上找一点O修建加油站,使加油站到公路
和公路
的距离相等,请用尺规作图法确定这个加油站O的位置.(保留作图痕迹,不写做法)
(2)作出
关于点A成中心对称的图形
(保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2022/12/3/3123146209124352/3132955741609984/STEM/d29342ec81d04978bf1397f35b513c8b.png?resizew=183)
(1)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
中,BC的垂直平分线与外角
的平分线交于点P,
于M,
于N.
![](https://img.xkw.com/dksih/QBM/2022/12/11/3128336669712384/3129348405665792/STEM/9b3e3438aba749f5a420e5aabef25ef2.png?resizew=173)
(1)求证:
;
(2)当
,
时,求BM和AM的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a852c13de65877be1f43ac1f88f179d7.png)
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![](https://img.xkw.com/dksih/QBM/2022/12/11/3128336669712384/3129348405665792/STEM/9b3e3438aba749f5a420e5aabef25ef2.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdc9f4a99b567a6ee4be3943beeddca.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
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解答题-作图题
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适中
(0.65)
【推荐1】请用无刻度的直尺和圆规完成下列作图:不写画法,保留作图痕迹.
(1)如图1,将四边形纸片
折叠一次,边
恰好落在直线
上,请作出折痕
;
![](https://img.xkw.com/dksih/QBM/2020/3/23/2425587577618432/2425800495980544/STEM/083646a3f5f8498d98b22c6e0b666b6b.png?resizew=356)
(2)如图2,已知
,点
在
边上,请在
边上找一点
,使得
.
(1)如图1,将四边形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/2020/3/23/2425587577618432/2425800495980544/STEM/083646a3f5f8498d98b22c6e0b666b6b.png?resizew=356)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0468fe5428eddded8c35a9901a821a7.png)
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解答题-作图题
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适中
(0.65)
【推荐2】已知:线段
,
,
.用尺规作出矩形
.
以下是小胡同学的作业:
①连结
,作线段
的垂直平分线,交
于点M;
②连结
并延长,在延长线上取一点D,使
,连结
,
,四边形
即为所求(如图所示).
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754727964540928/2755055246835712/STEM/93f427b7-4448-48aa-bb95-5bd518751911.png?resizew=347)
(1)如果你是老师,请问小胡同学做对了吗?如果对,请你帮他给出证明;如果不对,也请说明理由.
(2)请用不同于小胡的方法作出矩形
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
以下是小胡同学的作业:
①连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90652214876c38a46d35cb674feeeb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754727964540928/2755055246835712/STEM/93f427b7-4448-48aa-bb95-5bd518751911.png?resizew=347)
(1)如果你是老师,请问小胡同学做对了吗?如果对,请你帮他给出证明;如果不对,也请说明理由.
(2)请用不同于小胡的方法作出矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次