如图,正方形ABCD的边长为4,点P为对角线BD上一动点,点E在射线BC上.
![](https://img.xkw.com/dksih/QBM/2016/8/12/1574229076664320/1574229082750976/STEM/7d7b4560d0ce40ec9494a2f975787d00.png)
(1)填空:∠PBC= 度.
(2)若BE=t,连结PE、PC,则|PE+PC的最小值为 ,|PE﹣PC|的最大值是 (用含t的代数式表示);
(3)若点E 是直线AP与射线BC的交点,当△PCE为等腰三角形时,求∠PEC的度数.
![](https://img.xkw.com/dksih/QBM/2016/8/12/1574229076664320/1574229082750976/STEM/7d7b4560d0ce40ec9494a2f975787d00.png)
(1)填空:∠PBC= 度.
(2)若BE=t,连结PE、PC,则|PE+PC的最小值为 ,|PE﹣PC|的最大值是 (用含t的代数式表示);
(3)若点E 是直线AP与射线BC的交点,当△PCE为等腰三角形时,求∠PEC的度数.
更新时间:2016-12-06 13:20:10
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【推荐1】已知:如图,在△ABC中,AB=AC,以AB为直径的⊙O交BC于点D,过点D作DE⊥AC于点E.
(1)求证:DE是⊙O的切线;
(2)若∠CAB=120°,⊙O的半径等于5,求线段BC的长.
(1)求证:DE是⊙O的切线;
(2)若∠CAB=120°,⊙O的半径等于5,求线段BC的长.
![](https://img.xkw.com/dksih/QBM/2018/4/12/1922422273089536/1922657144610816/STEM/eefa2514acf04ae48dec79db888d4738.png?resizew=157)
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【推荐2】如图,AB∥CD,以点A为圆心,小于AC长为半径作圆弧,分别交AB,AC于E,F两点,再分别以E,F为圆心,大于
EF长为半径作圆弧,两条圆弧交于点P,作射线AP,交CD于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/2c540a52-337b-47d3-9c22-4dcebffd2a6f.png?resizew=261)
(1)若∠ACD=114°,求∠MAB的度数;
(2)若CN⊥AM,垂足为N,求证:AN=MN.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
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(1)若∠ACD=114°,求∠MAB的度数;
(2)若CN⊥AM,垂足为N,求证:AN=MN.
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【推荐1】如图,一块四边形花圃
中,已知
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/e4f7ef68-a25f-42a4-9864-a818c4945be2.png?resizew=150)
(1)求四边形花圃
的面积;
(2)求
到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ddcf6bbeeaa5b4a6e8c65ca24a5d26d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e0f7e08e014294c38b972cc1a8944e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a88aefea5d81c3b202df352b0b677d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3e93106653e069fb51e58d0649953c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/e4f7ef68-a25f-42a4-9864-a818c4945be2.png?resizew=150)
(1)求四边形花圃
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求
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【推荐2】如图,在正方形
中,
是边
上任意一点(点
不与
、
重合),连接
,作
的中垂线
,分别交
,
于点
,
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/32af6890-5b79-4752-bc96-8e882b4ed13a.png?resizew=118)
(1)求证:
;
(2)若
,
的面积为
,正方形
面积为
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的值为______
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】如图,
中,
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上一点,以
为直径的
与
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于点F,
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/53e118be-e2ac-4b73-9159-5eaf7b29f3c9.jpg?resizew=142)
(1)求证:
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的切线;
(2)若
的半径长为
,
,求
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(1)求证:
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(2)若
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【推荐2】综合与实践
问题情境:
综合与实践课上,老师让同学们以“正方形纸片的折叠”为主题开展数学活动,下面是同学们的折纸过程:
动手操作:
步骤一:将边长为
的正方形纸片
对折,使得点
与点
重合,折痕为
,再将纸片
展开,得到图1.
步骤二:将图
中的纸片
的右上角沿着
折叠,使点
落到点
的位置,连接
,
,得到图
.
步骤三:在图
的基础上,延长
与边
交于点
,得到图
.
问题解决:
(1)在图
中,连接
.①求
的度数.②求
的值.
(2)在图
的基础上延长
与边
交于点
,如图
,试猜想
与
之间的数量关系,并说明理由.
问题情境:
综合与实践课上,老师让同学们以“正方形纸片的折叠”为主题开展数学活动,下面是同学们的折纸过程:
动手操作:
步骤一:将边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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步骤二:将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
步骤三:在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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问题解决:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/4d294df6-3451-4545-88ab-fdb0bd20e650.png?resizew=706)
(1)在图
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(2)在图
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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【推荐1】如图,抛物线
,经过点
,
,
三点.
(1)求抛物线的解析式及顶点M的坐标;
(2)连接
,
,N为抛物线上的点且在第一象限,当
时,求N点的坐标;
(3)在(2)问的条件下,过点C作直线
轴,动点
在直线l上,动点
在x轴上,连接
,
,
,当m为何值时,
的和最小,并求出
和的最小值.
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(1)求抛物线的解析式及顶点M的坐标;
(2)连接
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(3)在(2)问的条件下,过点C作直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2d46cd426cd3af9482a97f72f3b3b5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f3eb5be429b199d84df29cf22a9a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f3eb5be429b199d84df29cf22a9a7e.png)
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,AC=4,BC=6,点E是斜边AB上的一个动点,连接CE,过点B,C分别作BD∥CE,CD∥BE,BD与CD相交于点D.
(1)当CE⊥AB时,求证:四边形BECD是矩形;
(2)填空:
①当BE的长为______时,四边形BECD是菱形;
②在①的结论下,若点P是BC上一动点,连接AP,EP,则AP+EP的最小值为______.
(1)当CE⊥AB时,求证:四边形BECD是矩形;
(2)填空:
①当BE的长为______时,四边形BECD是菱形;
②在①的结论下,若点P是BC上一动点,连接AP,EP,则AP+EP的最小值为______.
![](https://img.xkw.com/dksih/QBM/2020/3/3/2411446934274048/2411688985165825/STEM/8b3d48723d55417c99631c2c459cca61.png?resizew=140)
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