探究应用:
(1)如图①,在
中,中线
、
交于点
.若
的面积为6,求四边形
的面积.
小明在求解时,利用“三角形的中线平分此三角形的面积”的结论,连接
,设
的面积为
,
的面积为
,列出方程组
,解得
,所以四边形
的面积为
= .(请完善本小题的空格,共4个空格)
(2)如图②,在
中,
是中线,
,
与
、
分别交于点
、
.若四边形
的面积为
,求
的面积.
(3)在(2)的条件下,求
的面积.
![](https://img.xkw.com/dksih/QBM/2023/5/30/3248813141229568/3258218845847552/STEM/4014167a678c4d19b914edfecadc0742.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2023/5/30/3248813141229568/3258218845847552/STEM/21be328753ac4a2899ef2695456e90b8.png?resizew=175)
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce8737bbbe2e8d297a76dcbce42e4a3.png)
小明在求解时,利用“三角形的中线平分此三角形的面积”的结论,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f43dd27150098f6dfabfdac92da27e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9fdebbc8eed7c55c9148f0068e7a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a96919330f02b15c6fe3af3433a7e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48592e1c52c2bca8bdef3b16be61e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce8737bbbe2e8d297a76dcbce42e4a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e032fdcd2ec55670fa05453ffd7757.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/274cf35acb4a1748d15c39d15a9bea7b.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/7c418770e40af843f7ece2985fa13ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180ea775f2af05650404d764384e7faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在(2)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e323c08b18488d11bd8f3cd74efa971a.png)
![](https://img.xkw.com/dksih/QBM/2023/5/30/3248813141229568/3258218845847552/STEM/4014167a678c4d19b914edfecadc0742.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2023/5/30/3248813141229568/3258218845847552/STEM/21be328753ac4a2899ef2695456e90b8.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2023/5/30/3248813141229568/3258218845847552/STEM/ca3b24cd99e5406897064ab1704b1744.png?resizew=164)
更新时间:2023-06-12 18:46:07
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名校
【推荐1】如图,已知直线y=x﹣4与坐标轴分别交于点B、点C,二次函数y=﹣
x2+2x的图像经过点C.
(1)求直线与抛物线的另一个交点A的坐标及线段AB的长;
(2)若点D在x轴的正半轴上,是否存在以点D,C,B构成的三角形与△OAB相似?若存在,求出点D的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求直线与抛物线的另一个交点A的坐标及线段AB的长;
(2)若点D在x轴的正半轴上,是否存在以点D,C,B构成的三角形与△OAB相似?若存在,求出点D的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712426099376128/2716689566916608/STEM/e35f15a0edb64bf1a8a2a1e26e67acbc.png?resizew=189)
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【推荐2】直线
:
分别与
,
轴交于点
,
,线段
中点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/8a70af67-1cda-4a04-b2ec-2bb3cbbcb42d.png?resizew=391)
(1)求
,
的值;
(2)在
轴负半轴上有一点
,连接
交
轴于点
,若
,求点
坐标;
(3)在(2)条件下,
轴上一动点
由点
出发至点
,同时
轴上另一动点
由点
出发至点
,两动点均以每秒
个单位长的速度运动,设运动时间为
,若某一动点到达终点,则另一动点同时停止运动,连接
,求线段
中点
的运动路程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe5ec23e2940bb80291c3d91fc81024.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e0ed2564194a290ec4f536e214211a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/8a70af67-1cda-4a04-b2ec-2bb3cbbcb42d.png?resizew=391)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b82b7c206598535e5ab46c8542a0d403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)在(2)条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解题方法
【推荐1】【问题情境】
如图1,在
ABC中,
,AD⊥BC于点D,
,
,求AD的长.
【问题解决】
小明同学是这样分析的:将
ABD沿着AB翻折得到
ABE,将
ACD沿着AC翻折得到
ACF,延长EB、FE相交于点G,请按着小明的思路解答下列问题:
(1)由上可得四边形AEGF是 (填矩形、菱形、正方形中的一个);
(2)在Rt
GBC中运用勾股定理,求出AD的长.
【方法提炼】通过问题解决,小明发现翻折是解决问题的有效办法之一,它可以将问题中的相关信息有效地集中、关联与重组.请根据自己的理解,解答下列问题:
(3)如图2,在四边形ABCD中,
,
,
,
,求AC的最大值.
(4)如图3,在四边形ABCD中,
,AD=2,M是AB上一点,且
,
,
,直接写出CD的最大值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/28acd3ca-37ae-4180-bc91-c71e20bb6e41.png?resizew=480)
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b77d8d2a99713b192dc729ddc2275.png)
【问题解决】
小明同学是这样分析的:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)由上可得四边形AEGF是 (填矩形、菱形、正方形中的一个);
(2)在Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
【方法提炼】通过问题解决,小明发现翻折是解决问题的有效办法之一,它可以将问题中的相关信息有效地集中、关联与重组.请根据自己的理解,解答下列问题:
(3)如图2,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
(4)如图3,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c38f02977946c4a555d036e3c2d219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2caf62f2f51745dde72b7d1cea2c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3432d20e661779ddcefda76afcc2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048c053ec9544bb287a89322508ca1bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/28acd3ca-37ae-4180-bc91-c71e20bb6e41.png?resizew=480)
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【推荐2】【教材呈现】下图是华师版九年级上册数学教材第38页的部分内容.
请根据教材提示,结合图①,写出完整的解题过程.
【结论应用】如图②,某小区附近有一块长
,宽
的长方形空地,在空地上有两条相同宽度的人行步道(一纵一横)和一个边长为人行步道宽度7倍的正方形林闲广场,两条人行步道的总面积与正方形休闲广场的面积相等,设行步重的宽为
.
(1)求人行步道的宽.
(2)为了方便市民进行跑步健身,现按如图③所示方案增建塑胶跑道.已知塑胶跑道的宽为
,长方形区域甲的面积比长方形区域乙大
,且区域丙为正方形,直接写出塑胶跑道的总面积.
![](https://img.xkw.com/dksih/QBM/2019/11/19/2337186924699648/2337518569652224/STEM/f1eb6b522ba948cb8111671582b02559.png?resizew=142)
![](https://img.xkw.com/dksih/QBM/2019/11/19/2337186924699648/2337518569652224/STEM/7b402dcb7d714f74b1b68ab8d57d7464.png?resizew=168)
问题1 学校生物小组有一块长![]() ![]() ![]() 分析 问题中没有明确小道在试验田中的位置,试作出图①,不验发现小道的占地面积与位置无关.设小道宽为 ![]() ![]() ![]() ![]() |
【结论应用】如图②,某小区附近有一块长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3eb9b39420dfcf48e341125d8b629a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93831a6bf40df61383732557bb186a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39652e52d053266659edee3d97bf2818.png)
(1)求人行步道的宽.
(2)为了方便市民进行跑步健身,现按如图③所示方案增建塑胶跑道.已知塑胶跑道的宽为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186bc84348a2ff38ac0fbcb0ce02418d.png)
![](https://img.xkw.com/dksih/QBM/2019/11/19/2337186924699648/2337518569652224/STEM/f1eb6b522ba948cb8111671582b02559.png?resizew=142)
![](https://img.xkw.com/dksih/QBM/2019/11/19/2337186924699648/2337518569652224/STEM/7b402dcb7d714f74b1b68ab8d57d7464.png?resizew=168)
![](https://img.xkw.com/dksih/QBM/2019/11/19/2337186924699648/2337518569652224/STEM/4709036160a34b4bbd2d55e33f193600.png?resizew=133)
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【推荐3】如图,在平面直角坐标系
中,已知
,
,
,
为矩形
内一点(不包括边界),过点
分别作
轴和
轴的平行线,这两条平行线把矩形
分为四个小矩形,若这四个小矩形中有一个矩形的面积的值等于
的长度,则称点
为矩形
的“常积点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/971502d4-4f2a-409f-9b77-3a6fc4ee4a71.png?resizew=232)
(1)在点
,
,
,
中,是矩形
“常积点”的为______;(填写所有正确的字母代号)
(2)若点
是矩形
的“常积点”,且对应的小矩形的一条边在
轴上,求
的值;
(3)若点
是矩形
的“常积点”,且对应的小矩形的一条边在
轴上,一次函数
(
为常数,且
)的图像上“常积点”
的个数随着
的值变化而变化,请直接写出该图像上“常积点”
的个数及对应的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab9ba84e389ec80950fe6efaafa5ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa48006de8a73b2d34905a9fb1c0eb56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec15578ee35dcea2ac58e2ab1023024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.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/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/971502d4-4f2a-409f-9b77-3a6fc4ee4a71.png?resizew=232)
(1)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e93d773647a0000e446ef301195ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198d146620a890d71be61f492973069d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f72c26e5d9b553625e492138cdbd184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4611675fa5886dbf7a78fc54c6f25d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247d893c8001564c5d3a1901dde7d1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c538448342178c094504ccb2ad64f54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解答题-问答题
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【推荐1】【问题提出】
(1)如图1,点D是
边BC的中点,则
(填“
、
、
”,下同);
如图2,直线
,A、B为直线n上两点,C、P为直线m上两点,则
;
【问题探究】
(2)如图3,点D是
边
上一定点,使用三角板在
上作出点E,使得线段
将
分成面积相等的两部分,并说明理由.
【问题解决】
(3)如图4,四边形
是铁一曲江悦耕园的一块不规则空地,为了丰富悦耕园的农作物,“一米菜园”选修课的同学们决定在这块地里种植两种农作物,打算过点C修一条笔直的通道,以便同学们打理农作物,要求通道两侧种植农作物的面积相等.经测量
米,
米,
,
,
.若将通道记为
,请你画出通道
,并求出通道
的长.
(1)如图1,点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4673ef63a8d89687b96ee09887ac3daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c141b06b158e0cdef08fcda3ea44a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
如图2,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0205571fa39f343ee5749b78d466bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ba707cd41b3c1871e807e4cbad8e28.png)
【问题探究】
(2)如图3,点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【问题解决】
(3)如图4,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975645d6a73a7326974511ca80b37f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b755ee4dda4a72063c6fba125720a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b0382c28547d3834ca71f3f0677695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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解答题-作图题
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较难
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【推荐2】如图,在每个小正方形边长为1的方格纸内将△ABC经过一次平移后得到△A′B′C′,图中标出了点B的对应点B′.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968755216711680/2971392214171648/STEM/e0b62e8a-3399-471a-9c51-1e62ee14e31e.png?resizew=235)
根据下列条件,利用格点和三角尺画图:
(1)补全△A′B′C′;
(2)请在AC边上找一点D,使得线段BD平分△ABC的面积,在图上作出线段BD;
(3)利用格点在图中画出AC边上的高线BE;
(4)找△ABF(要求各顶点在格点上,F不与点C重合),使其面积等于△ABC的面积.满足这样条件的点F共_______个.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968755216711680/2971392214171648/STEM/e0b62e8a-3399-471a-9c51-1e62ee14e31e.png?resizew=235)
根据下列条件,利用格点和三角尺画图:
(1)补全△A′B′C′;
(2)请在AC边上找一点D,使得线段BD平分△ABC的面积,在图上作出线段BD;
(3)利用格点在图中画出AC边上的高线BE;
(4)找△ABF(要求各顶点在格点上,F不与点C重合),使其面积等于△ABC的面积.满足这样条件的点F共_______个.
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解题方法
【推荐3】问题提出:
(1)如图1,在△ABC中,已知AB=AC=5,BC=4,在BC上找一点D,使得线段AD将△ABC分成面积相等的两部分,画出线段AD,并写出AD的长为 .
问题探究:
(2)如图2,点D是△ABC边AC上一定点,在BC上找一点E,使得线段DE将△ABC分成面积相等的两部分,并说明理由.
问题解决:
(3)如图3,四边形ABCD是西安市高新区新近改造过程中的一块不规则空地,为了美化环境,市规划办决定在这块地里种植两种花卉,打算过点C修一条笔直的通道,以便市民出行观赏花卉,要求通道两侧种植花卉的面积相等,经测量AB=20米,AD=100米,∠A=60°,∠ABC=150°,∠BCD=120°,若将通道记为CF,请你画出通道CF,并求出通道CF的长.
(1)如图1,在△ABC中,已知AB=AC=5,BC=4,在BC上找一点D,使得线段AD将△ABC分成面积相等的两部分,画出线段AD,并写出AD的长为 .
问题探究:
(2)如图2,点D是△ABC边AC上一定点,在BC上找一点E,使得线段DE将△ABC分成面积相等的两部分,并说明理由.
问题解决:
(3)如图3,四边形ABCD是西安市高新区新近改造过程中的一块不规则空地,为了美化环境,市规划办决定在这块地里种植两种花卉,打算过点C修一条笔直的通道,以便市民出行观赏花卉,要求通道两侧种植花卉的面积相等,经测量AB=20米,AD=100米,∠A=60°,∠ABC=150°,∠BCD=120°,若将通道记为CF,请你画出通道CF,并求出通道CF的长.
![](https://img.xkw.com/dksih/QBM/2020/9/10/2546514642288640/2547663072206848/STEM/6c7f3d22549842e6bb06c28088ad2a5b.png?resizew=548)
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【推荐1】如图,在平面直角坐标系xOy中,一次函数
(m为常数)的图象与x轴交于点A(-3,0),与y轴交于点C,以直线x=1为对称轴的抛物线y=ax2+bx+c(a、b、c为常数,且a≠0)经过A、C两点,并与x轴的正半轴交于点B
(1) 求m的值及抛物线的函数表达式;
(2) 是否存在抛物线上一动点Q,使得△ACQ是以AC为直角边的直角三角形?若存在,求出点Q的横坐标;若存在,请说明理由;
(3) 若P是抛物线对称轴上一动点,且使△ACP周长最小,过点P任意作一条与y轴不平行的直线交抛物线于M1(x1,y1),M2(x2,y2)两点,试问
是否为定值,如果是,请求出结果,如果不是请说明理由. (参考公式:在平面直角坐标之中,若A((x1,y1),B(x2,y2),则A,B两点间的距离为
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf9ebc750f290b4efbe91f3477967fc.png)
(1) 求m的值及抛物线的函数表达式;
(2) 是否存在抛物线上一动点Q,使得△ACQ是以AC为直角边的直角三角形?若存在,求出点Q的横坐标;若存在,请说明理由;
(3) 若P是抛物线对称轴上一动点,且使△ACP周长最小,过点P任意作一条与y轴不平行的直线交抛物线于M1(x1,y1),M2(x2,y2)两点,试问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed345a97ec7c8a7026d39753bf70204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8a6b20f190d4b2c8dcc2c4478a6cbb.png)
![](https://img.xkw.com/dksih/QBM/2017/8/17/1754072762884096/1759981640400896/STEM/08139f4642864cc793ec282d573b0f68.png?resizew=246)
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解答题-证明题
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较难
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【推荐2】如图,已知正方形
和正方形
.
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986951193460736/2992533515853824/STEM/d3df6e88-51e4-4353-807b-c9ebf0ad3d2a.png?resizew=565)
(1)在图1中,点E,F,G分别在边
,
,
上,直接写出
________;
(2)将正方形
绕点A顺时针旋转至图2所示位置,连接
,
,请问(1)中的结论是否发生变化?并加以证明:
(3)如果正方形
的边长为5,正方形
的边长为3.
①将正方形
绕点A顺时针旋转至图3所示位置,连接
交
于点M,交
于点N,若
,直接写出
的长________;
②当正方形
绕点A顺时针旋转至点E,F,B三点共线时,直接写出
的长________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986951193460736/2992533515853824/STEM/d3df6e88-51e4-4353-807b-c9ebf0ad3d2a.png?resizew=565)
(1)在图1中,点E,F,G分别在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec9b6c023b65b06a8ec7411e667a701.png)
(2)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
(3)如果正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
①将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1e0147f8bddaba828152b40efe5b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
②当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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