等腰直角
与等腰直角
的直角顶点
重合.
与
相交于
,
的延长线交
于
,连接
.
(1)如图1,求证:
;
(2)如图2,
,
,
在同一条直线上,取
的中点
,分别连接
,
,求证:
;
(3)如图3,过
作
的平行线,过
作
的平行线,两线相交于
,且点
在
的延长线上,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bc4672599da329642dd46717ae587e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/31304585-9be5-47c7-8e90-d6e0d8c0cbe7.png?resizew=208)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7bfae5bd300c678dad3a8eb00adc65.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca7859562bb375c604b9aae46a9bcc5.png)
(3)如图3,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dbbe0e92c25f2e8c5c552157a350acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13340275ca97809c5789d4f70a9f185c.png)
2022·安徽合肥·模拟预测 查看更多[5]
2022年安徽省合肥省十校中考联考数学试题(三)(已下线)专题4.10 图形的相似章末十大题型总结(拔尖篇)-2023-2024学年九年级数学上册举一反三系列(北师大版)(已下线)专题23.10 图形的相似章末十大题型总结(拔尖篇)-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)专题4.10 相似三角形章末十大题型总结(拔尖篇)-2023-2024学年九年级数学上册举一反三系列(浙教版)(已下线)专题22.10 相似形章末十大题型总结(拔尖篇)-2023-2024学年九年级数学上册举一反三系列(沪科版)
更新时间:2023-10-12 16:24:04
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,把一个含45°角的直角三角板ECF和一个正方形ABCD摆放在一起,使三角板的直角顶点和正方形的顶点C重合,点E、F分别在正方形的边CB、CD上,连AF
取AF的中点M,EF的中点N,连接MD、MN.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881475738517504/2945357659684864/STEM/49d7e70d-f2f1-49b0-9468-8b4cfcd9a553.png?resizew=327)
(1)请判断MD与MN之间的数量关系,直接写出结论;
(2)将图1中的直角三角板ECF绕点C顺时针旋转180°得到图2,其他条件不变,则(1)中的结论还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)连接DN,若AB=3,CE=2,将图1中的直角三角板ECF绕点C在平面内自由旋转,其他条件不变,请直接写出△DMN面积的最大值和最小值.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881475738517504/2945357659684864/STEM/66c22e876f6446cc861445be1fb5be8e.png?resizew=3)
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881475738517504/2945357659684864/STEM/49d7e70d-f2f1-49b0-9468-8b4cfcd9a553.png?resizew=327)
(1)请判断MD与MN之间的数量关系,直接写出结论;
(2)将图1中的直角三角板ECF绕点C顺时针旋转180°得到图2,其他条件不变,则(1)中的结论还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)连接DN,若AB=3,CE=2,将图1中的直角三角板ECF绕点C在平面内自由旋转,其他条件不变,请直接写出△DMN面积的最大值和最小值.
您最近一年使用:0次
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【推荐2】如图,点
是反比例函数
(
>
)图象上的一点. 过点
分别作
轴、
轴的平行线,分别与
轴、
轴交于点
,
,与经过点(
,
)的双曲线
.(
,
>
)交于点
,
,连接
.
(1)求
的值;
(2)连接
,
.若点
的横坐标为
,求△
的面积;
(3)若直线
分别与
轴,
轴交于点
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef854dfcbba9b7dedc1bc52f6332b011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29819c98ebd087116d5e579f4f088fe8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/791fec9b-9f2b-420d-9c75-c0eaee4957ba.png?resizew=175)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在△ABC中,点P是BC边上的动点,点M是AP的中点,PD⊥AB,垂足为D,PE⊥AC,垂足为E,连接MD,ME.
(Ⅰ)求证:∠DME=2∠BAC;
(Ⅱ)若∠B=45°,∠C=75°,AB=6
,连接DE,求△MDE周长的最小值.
(Ⅰ)求证:∠DME=2∠BAC;
(Ⅱ)若∠B=45°,∠C=75°,AB=6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/2019/5/24/2210403546742784/2211232244244480/STEM/35f7cb51e09f47329f66380f427d43c4.png?resizew=166)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图一,在射线
的一侧以
为一条边作矩形
,
,
,点
是线段
上一动点(不与点
重合),连接
,过点
作
的垂线交射线
于点
,连接
.
的大小;
(2)问题探究:
动点M在运动的过程中,是否能使
为等腰三角形,如果能,求出线段
的长度;如果不能,请说明理由.
(3)问题解决:
如图二,当动点
运动到
的中点时,
与
的交点为
,
的中点为
,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e0723e7013e52f56898fb12772d0c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640f058b479299659893cf524ddf6544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
(2)问题探究:
动点M在运动的过程中,是否能使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
(3)问题解决:
如图二,当动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐1】如图1,已知四边形是平行四边形,
,
,
,点
从点
出发,沿
方向移动到点
停止.过点
作
的垂线,垂足为点
,设
的长为
,
的长为
.请解答下列问题:
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)通过取点,画图,测量得到了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
3 | 4 | 5 | 6 | 7 | 8 | |
4 | 4 |
请直接写出m和n的值;
(3)如图2,请在平面直角坐标系中画出该函数的图像;
(4)请直接写出y的最小值.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】对于平面直角坐标系:
内任意一点P.过P点作
轴于点M,
轴于点N,连接
,则称
的长度为点P的垂点距离,记为h.特别地,点P与原点重合时,垂点距离为0.
![](https://img.xkw.com/dksih/QBM/2023/11/16/3369166670946304/3371303430938624/STEM/9c4b6dfafa3a48a2bdfa63b46d542d6f.png?resizew=269)
(1)点
,
,
的垂点距离分别为 , , .
(2)点P在以
为圆心,半径为3的
上运动;求点P的垂点距离h的取值范围.
(3)点T为直线l:
位于第二象限内的一点,对于点T的垂点距离h的每个值有且仅有一个点T与之对应,求点T的横坐标t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ada707c061972d4e70925b538482e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2023/11/16/3369166670946304/3371303430938624/STEM/9c4b6dfafa3a48a2bdfa63b46d542d6f.png?resizew=269)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24705e5759ac944559f305c694c9f6d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0fe98d8133e4478b0512c2b1cea311.png)
(2)点P在以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bd4d89b33386e3346bc23c0c7e0308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
(3)点T为直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc02c6949ec384348162d7bf81092f9a.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,正方形
的边长为2,将正方形
绕点B旋转一周,连接
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/517d7189-e434-465f-bf9e-536b8aae7a00.png?resizew=244)
(1)请判断线段
和
的数量关系,并说明理由;
(2)当A、E、F三点在同一直线上时,求
的长;
(3)设
的中点为M,连接
,试求线段
长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/517d7189-e434-465f-bf9e-536b8aae7a00.png?resizew=244)
(1)请判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)当A、E、F三点在同一直线上时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】【探索发现】如图①,是一张直角三角形纸片,
,小明想从中剪出一个以
为内角且面积最大的矩形,经过多次操作发现,当沿着中位线
剪下时,矩形的面积最大,经证明发现:矩形的最大面积与原三角形面积的比值为__________.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/d39451ab-56ed-4c51-ae8e-ad62709ed175.png?resizew=581)
【拓展应用】
如图②,在
中,
,
边上的高
,矩形
的顶点
分别在边
上,顶点
在边
上,则矩形
面积的最大值为__________.(用含
的代数式表示)
【灵活应用】
如图③,有一块“缺角矩形”
,小明从中剪出了一个面积最大的矩形(
为所剪出矩形的内角),求该矩形的面积.
【实际应用】
如图④,现有一块四边形的木板余料
,经测量
,且
,木匠徐师傅从这块余料中裁出了顶点
在边
上且面积最大的矩形
,求该矩形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c700aba9c6abc4f9e93fbc268929b9a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/d39451ab-56ed-4c51-ae8e-ad62709ed175.png?resizew=581)
【拓展应用】
如图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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d22f065ec04de109d913e8e7855110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/affbbbc112ab58e6b7066ce1c7699db0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b927242223336dee4ae69314709172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec707e3852297341490f121f2c4a245b.png)
【灵活应用】
如图③,有一块“缺角矩形”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb1eeb031efd9aa72875e42b37e5446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
【实际应用】
如图④,现有一块四边形的木板余料
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa805451ab476d84edbcf4b7bf35ec4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592eaf4082b7ec72379f521c03f01545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】已知二次函数y=ax2+bx-2的图象与x轴交于A,B两点,与y轴交于点C,点A的坐标为(4,0),且当x=-2和x=5时二次函数的函数值y相等.
![](https://img.xkw.com/dksih/QBM/2018/1/17/1862539952660480/1865374046126080/STEM/323591f10e4f4d6485660ea39dfe0ee9.png?resizew=229)
(1)求实数a,b的值;
(2)如图①,动点E,F同时从A点出发,其中点E以每秒2个单位长度的速度沿AB边向终点B运动,点F以每秒
个单位长度的速度沿射线AC方向运动.当点E停止运动时,点F随之停止运动.设运动时间为t秒.连接EF,将△AEF沿EF翻折,使点A落在点D处,得到△DEF.
①是否存在某一时刻t,使得△DCF为直角三角形?若存在,求出t的值;若不存在,请说明理由;
②设△DEF与△ABC重叠部分的面积为S,求S关于t的函数关系式.
![](https://img.xkw.com/dksih/QBM/2018/1/17/1862539952660480/1865374046126080/STEM/323591f10e4f4d6485660ea39dfe0ee9.png?resizew=229)
(1)求实数a,b的值;
(2)如图①,动点E,F同时从A点出发,其中点E以每秒2个单位长度的速度沿AB边向终点B运动,点F以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
①是否存在某一时刻t,使得△DCF为直角三角形?若存在,求出t的值;若不存在,请说明理由;
②设△DEF与△ABC重叠部分的面积为S,求S关于t的函数关系式.
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