如图,菱形
中,
,且
,
,连接
、
,作
,垂足为F.
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394086239862784/2394449648214016/STEM/a9ea4a53d20246daaa527909c46501a1.png?resizew=137)
(1)判断
的形状(直接写出即可);
(2)求
的长度;
(3)若动点P,Q同时从点B出发,在
边上运动,P沿
路径匀速运动,Q沿
路径匀速运动,当两点相遇时运动停止,已知点P的运动速度为2单位/秒,点Q的运动速度为1单位/秒,设运动时间为x秒,
的面积为y,求当x为何值时,y取得最大值?最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fd76d8997e3b2db7d9cb9b72d0f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7719aa677cf563cf295b1588eab60d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1893d78af450a5fa09810537adc2dfa.png)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394086239862784/2394449648214016/STEM/823ba0722acc40ada5b5abb347514634.png?resizew=137)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394086239862784/2394449648214016/STEM/a9ea4a53d20246daaa527909c46501a1.png?resizew=137)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)若动点P,Q同时从点B出发,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760a51352cf6fc58a0cd0797763b90eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5347fb06cc3e48a1fb482c8e30dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333a89e8227c1f57313897d4424d04f0.png)
2019·云南·一模 查看更多[1]
(已下线)【万唯】云南省2018-2019年初中学业水平数学模拟考题 《逆袭卷2》
更新时间:2020-02-08 09:43:11
|
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解答题-作图题
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适中
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【推荐1】如图1、如图2均是边长为1的正方形网格,请按要求用实线画出顶点在格点上的图形.
(1)在图1上,画出一个面积最大的矩形ABCD,并求出它的面积;
(2)在图2上,画出一个菱形ABCD,并求出它的面积.
(1)在图1上,画出一个面积最大的矩形ABCD,并求出它的面积;
(2)在图2上,画出一个菱形ABCD,并求出它的面积.
![](https://img.xkw.com/dksih/QBM/2019/8/14/2268457066078208/2268490495590400/STEM/ac900c103cd5410c9dba4cde35722915.png?resizew=339)
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解答题-证明题
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【推荐2】如图①,
,
平分
,交
于点
,
平分
,且交
于点
,交
于点
,连接
.
是菱形.
(2)若
,
,点
为射线
上任意一点,连接
和
,如图②.求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf7dc43a39738e3e2a0b819be505c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,AB=AC,⊙O是△ABC的内切圆,切点为D、E、F,连接DE、CD交⊙O于G,连接EG并延长交BC于H.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942567037935616/2965099666702336/STEM/9e440996-6ca1-41af-9e17-c8898fc04dd5.png?resizew=154)
(1)求证:DE∥BC
(2)连接AG,若EH⊥BC求
的值;
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942567037935616/2965099666702336/STEM/9e440996-6ca1-41af-9e17-c8898fc04dd5.png?resizew=154)
(1)求证:DE∥BC
(2)连接AG,若EH⊥BC求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87df048e085cd27fa54a829304a7c95b.png)
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解答题-问答题
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,tan36.9°≈
, sin67.5°≈
,tan67.5°≈
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
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