如图所示,在
中,点D为BC边上的一点,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/41fe8ee9-bc9c-4126-b0f3-86049f679c39.png?resizew=203)
(1)试说明
;
(2)求AC的长及
的面积;
(3)判断
是否是直角三角形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf05aaa351239448a9ab0e048f76faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5603e25f75ac029e86b4d94b434910c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd4997da49b3dfe98144ad13aed0d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733bba216525446cfd89431c62b9d3fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/41fe8ee9-bc9c-4126-b0f3-86049f679c39.png?resizew=203)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)求AC的长及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2022-07-17 09:03:09
|
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解答题-问答题
|
适中
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【推荐1】如图,已知函数
的图象与
轴交于点
,一次函数
的图象经过点
,与
轴以及
的图象分别交于点
,
,且点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/c476e63c-b7c6-48f2-bf3a-6cd00120c2ae.png?resizew=156)
(1)则
______,
______,
______;
(2)若函数
的值大于函数
的函数值,则
的取值范围是______;
(3)求四边形
的面积;
(4)在
轴上存在点
,使得以点
,
,
为顶点的三角形是直角三角形,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3544997cc034ed882c0d0a3bdbf5f957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c9e6536dd347d9079bee07eaf4580c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/c476e63c-b7c6-48f2-bf3a-6cd00120c2ae.png?resizew=156)
(1)则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8735e2de0ec29640d1eff9e043556030.png)
(4)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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2】问题情境:如图1,点E为正方形
内一点,
,将
绕点B顺时针旋转
,得到
,若,延长
交
于点F,连接
.
猜想证明:
的形状,并说明理由;
(2)如图2,若
,猜想线段
与
的数量关系并加以证明;
解决问题:
(3)如图1,若
,
,直接写出
的长.(结果可含根式)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
猜想证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5f7c29a8e8bf026d46abc0554cffe7.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810242c9205006b28c6bc6612c2b1cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f574463a3c3541e3e42cf7e1fee8e13.png)
解决问题:
(3)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce84f6062f12bf6ef42d7b733cd2248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
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【推荐1】如图,在四边形
中,对角线
、
相交于点O,
,
.
是平行四边形;
(2)若
,
,
,四边形
是菱形吗?证明你的判断.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edbbab119e1b312eb4b09d383a4410a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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真题
【推荐2】如图1,△ABC是等腰直角三角形,AC=BC=4,∠C=90°,M,N分别是边AC,BC上的点,以CM,CN为邻边作矩形PMCN,交AB于E,F.设CM=a,CN=b,若ab=8.
(2)①当a=b时,求∠ECF的度数;
②当a≠b时,①中的结论是否成立?并说明理由.
(2)①当a=b时,求∠ECF的度数;
②当a≠b时,①中的结论是否成立?并说明理由.
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【推荐3】阅读下列材料:
问题:如图1,在正方形ABCD内有一点P,PA
,PB
,PC=1,求∠BPC的度数.
小明同学的想法是:已知条件比较分散,可以通过旋转变换将分散的已知条件集中在一起,于是他将
BPC绕点B逆时针旋转90°,得到了
(如图2),然后连接
.
(1)请你参考小明同学的思路,求∠BPC的度数.
(2)判断
APB的形状,并说明理由.
(3)如图3,若在正六边形ABCDEF内有一点P,且PA
,PB=4,PC=2,直接写出∠BPC的度数和正六边形ABCDEF的边长.
问题:如图1,在正方形ABCD内有一点P,PA
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd516e4b396722941982a389ee6e524c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae65bdb69940a67a18d56ff02060b22.png)
小明同学的想法是:已知条件比较分散,可以通过旋转变换将分散的已知条件集中在一起,于是他将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db93a66331256cbfe5f4937e71134c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
(1)请你参考小明同学的思路,求∠BPC的度数.
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)如图3,若在正六边形ABCDEF内有一点P,且PA
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解答题-计算题
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【推荐2】如图,某景观区内有一块四边形空地,景区管理人员想在这块空地上铺满观赏草坪,需要测量其面积,经技术人员测量,
,
米,
米,
米,
米,请你用学过的知识帮管理员计算出四边形
的面积.
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