用无刻度直尺画图:
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979946961330176/2979999649333248/STEM/673cf0ea-e37c-4c0b-9424-553f3da33c2c.png?resizew=368)
(1)如图1,计算sin∠ABC=_________ ,在AC上画一点E,使tan∠ABE=
;
(2)如图2,在BC上画一点G,使
=
,在AC上画点M,使
.
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979946961330176/2979999649333248/STEM/673cf0ea-e37c-4c0b-9424-553f3da33c2c.png?resizew=368)
(1)如图1,计算sin∠ABC=_________ ,在AC上画一点E,使tan∠ABE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(2)如图2,在BC上画一点G,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d32c006c60cd9249670fd09fc48f3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e80ce626b636fb3b4044f35227ad68.png)
更新时间:2022-05-15 16:47:43
|
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知
中,
,
,在
外有一点
,连接
,
,
,将
绕点
按顺时针方向旋转得到
,
与
交于点
,且
.
(1)求
的大小;
(2)连接
,若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/b0d532d2-41cb-410a-9655-2182bea7089f.png?resizew=185)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b135e5dbd74d4cea2793474b8dd400a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640f058b479299659893cf524ddf6544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在四边形
中,
,
,对角线
,
相交于点O,
平分
,过点C作
交
的延长线于点E.
是菱形;
(2)若
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,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,点
,
分别位于反比例函数
图像的两分支上,且
轴于点C,
轴于点D,连接
,延长
,
交于点P,连接
,分别与x轴,y轴相交于点E,F.
的直角顶点P落在第二象限.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/3dfcf681-6fcd-4472-b575-1d98669eef72.png?resizew=180)
(1)求k的值.
(2)求证:
.
(3)当四边形
的面积为6时,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6868a51ea0a78f2605d3d1cbe701351b.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/3dfcf681-6fcd-4472-b575-1d98669eef72.png?resizew=180)
(1)求k的值.
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
(3)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,
,以
为直径作
交
于点D.过点D作
,垂足为E,延长
交
于点F.
(1)求证:
是
的切线;
(2)若
,
的半径为5,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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(2)若
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解答题-问答题
|
适中
(0.65)
【推荐3】问题1:如图①,在△ABC中,AB=4,D是AB上一点(不与A,B重合),DE∥BC,交AC于点E,连接CD.设△ABC的面积为S,△DEC的面积为S′.
(1)当AD=3时,
= ;
(2)设AD=m,请你用含字母m的代数式表示
.
问题2:如图②,在四边形ABCD中,AB=4,AD∥BC,AD=
BC,E是AB上一点(不与A,B重合),EF∥BC,交CD于点F,连接CE.设AE=n,四边形ABCD的面积为S,△EFC的面积为S′.请你利用问题1的解法或结论,用含字母n的代数式表示
.
(1)当AD=3时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4859b3514b6128b29f9490b82b8c183c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4859b3514b6128b29f9490b82b8c183c.png)
问题2:如图②,在四边形ABCD中,AB=4,AD∥BC,AD=
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解答题-作图题
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适中
(0.65)
【推荐1】综合实践活动课,某数学兴趣小组在学校操场上想测量汽车的速度,利用如下方法:如图,小王站在点处A(点A处)和公路(l)之间竖立着一块30m长且平行于公路的巨型广告牌(DE).广告牌挡住了小王的视线,请在图中画出视点A的盲区,并将盲区内的那段公路记为BC.已知一辆匀速行驶的汽车经过公路BC段的时间是3s,已知小王到广告牌和公路的距离是分别是40m和80m,求该汽车的速度?
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解答题-问答题
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适中
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【推荐1】在△ABC中,∠C=90°,AC=
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954795d1842974a705f9468f3b952ab1.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,
是
的角平分线,作
交
于点E,作
交
于点F.
是菱形;
(2)若
,则
的值为 .
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您最近一年使用:0次