如图,在
ABC中,AB=10cm,AC=8cm,BC=6cm.现将
ABC进行折叠,使点A恰好与点B重合.
(1)判断
ABC的形状,并说明理由;
(2)求折痕DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)求折痕DE的长.
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847577973489664/2851718947495936/STEM/33efb467-98cf-4717-8b6a-7975905a7041.png)
更新时间:2021-11-15 10:59:57
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【推荐1】如图,
的直径为10,弦
=6,D是弧
的中点,连接
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3919bf9dce67c9522d2f3878b69cac40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/839c42df-dccf-4171-8ac3-e0ba674a767d.png?resizew=160)
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【推荐2】等边
中,点
,
分别是边
,
上的点,且
,
,
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/b4580329-471d-4d0f-97ef-1880e4cde006.png?resizew=172)
(1)求证:
.
(2)求
的度数.
(3)若
,
,则
的面积为______.(直接写出答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/2c8fb32ae05a9c1abd3374f5c5f7a999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/b4580329-471d-4d0f-97ef-1880e4cde006.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e238f17e8e5277a4194d78d33af1f0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ee1c8b8f17e6adfe29201544ee304c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
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解答题-问答题
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【推荐1】在求解一类代数问题时,我们常常将二次三项式
化成
的形式,并利用
的非负性解决问题.请阅读下列材料,并解决相关问题:
【例1】求代数式
的最小值.
解:
.
因为
,所以
,即代数式
的最小值为3.
【例2】若
,求
、
的值.
解:因为
,
所以
,
即
,
因为
,
,
所以
,
即
.
(1)求代数式
的最小值;
(2)在
中,
,
,
.
①若
是等腰三角形,且满足
,求
的周长;
②若
,且
,求
中最大边上的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479fbc4acd0fa10e20145a71ce9a98d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e156c1f2bb7fdeb24a547b393ecd76f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7566360b7ef53e12c344d03c4bad0850.png)
【例1】求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8733211b024fc1e1093f8bd0dd8c605f.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c69f2ef3cbf7eba2b5c7f4cd00ddaae.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86b795d92308c9f5eb6209f0213f905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e756f500a2febea1824805c713d78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8733211b024fc1e1093f8bd0dd8c605f.png)
【例2】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf72e8aad5b0e809dc97ecb8d28a443.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8989fead62857fb90b5199bdcad51654.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0e1200181cabd78d3808d5ded78fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15e74cc81be65a819e0fb99fe5221a0.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfba803dbead011f244b99551f40142.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d883d7c925d974922cd11e2d4f206a.png)
(1)求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac0468d0f1b517d6a1e992e675995e3.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c511488c545cd8b359d81357d60d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6fe82b68a55c00b62cf384ac25d1f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b877b529e324c948a1e4aec51eb1377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】今年第6号台风“烟花”登录我国沿海地区,风力强,累计降雨量大,影响范围大,有极强的破坏力.如图,台风“烟花”中心沿东西方向AB由A向B移动,已知点C为一海港,且点C与直线AB上的两点A、B的距离分别为AC=600km,BC=800km,又AB=1000km,以台风中心为圆心,周围500km以内为受影响区域.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/4d994b49-b09d-40ee-a9ee-00fbfc446dec.png?resizew=260)
(1)求∠ACB的度数;
(2)海港C受台风影响吗?为什么?
(3)若台风中心的移动速度为28千米/时,则台风影响该海港持续的时间有多长?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/4d994b49-b09d-40ee-a9ee-00fbfc446dec.png?resizew=260)
(1)求∠ACB的度数;
(2)海港C受台风影响吗?为什么?
(3)若台风中心的移动速度为28千米/时,则台风影响该海港持续的时间有多长?
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