真题
1 . 如图,在平面直角坐标系中,一次函数
的图象与
轴交于点
,与
轴交于点
,抛物线
经过
、
两点,在第一象限的抛物线上取一点
,过点
作
轴于点
,交
于点
.
(2)是否存在点
,使得
和
相似?若存在,请求出点
的坐标,若不存在,请说明理由;
(3)
是第一象限内抛物线上的动点(不与点
重合),过点
作
轴的垂线交
于点
,连接
,当四边形
为菱形时,求点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60ecd5f53b3469726c8cb09e86ff20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70986d34cfbb5f7711e504e0f92f9ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cd8576a1aaed7e787af3f5b19822a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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2 . 陕北的窑洞是依山势开凿出来的这样一个拱顶的窑洞.由于黄土高原的黄土本身具有直立不塌的性质,而拱顶的承重能力又比平顶要好,所以窑洞一般都是采取拱顶的方式来保证了它的稳固性.如图为某窑洞门的示意图,如右图建立平面直角坐标系,窑洞的下半部分四边形
为矩形,且
窑洞的上半部分的拱形近似为抛物线的一部分,窑洞门的最高点距地面为 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ef0a33d8ad24d854292ce0cb928742.png)
(2)窑洞主人对窑洞的拱形部分进行设计,设计图如图所示,其中,点M,N在抛物线上,
,
,
,
,
均垂直于
,
,
交
于点Q,R,已知.
四边形
和四边形
为正方形,求点 M,N 的坐标;
(3)判断四边形
的形状并说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862529127f259d85e366f5c31bdc3c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd385f31dddcd490a8e72a4a1c6237f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ef0a33d8ad24d854292ce0cb928742.png)
(2)窑洞主人对窑洞的拱形部分进行设计,设计图如图所示,其中,点M,N在抛物线上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda40d4d62aa28f9e5f877bbea5ce511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b326654b3cbfbbe6ef861804d59b8ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05250abe6da85eb0b555948d7dbaf317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe0092ffe905a4fd88e2abc1d23fbf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04baaea36511681098765a2a80d28341.png)
(3)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ab69b0ece7e75cd29cefa4b69e3842.png)
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3 . 如图,在矩形
中,
,
.设P,Q分别为
,
上的动点,点P自点D沿
方向作匀速移动的同时,点Q自点B沿
方向向点C作匀速移动,移动的速度均为
,设P,Q移动的时间为t(
).
?
(2)写出
的面积
与时间
之间的函数表达式,当t为何值时,S有最大值?最大值是多少?
(3)当t为何值时,
为等腰三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35ed92397da56c7afbd6967597a9611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9547f6b5c7c54d216ecea72becb7d373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654bdcd4d474a9899693db1eec0d71e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aa9b9894a953c812b52eba95559f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f24325565a9dd95128a633a240da2.png)
(2)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f372e567a416d3dc405b2b0d72506b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d744165d6aad705f64de41a9d931750a.png)
(3)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
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名校
4 . 如图1所示是某家具厂的抛物线木板余料,其最大高度为
,最大宽度为
,现计划将此余料进行切割:
的中点O为原点,水平向右为x轴正方向,竖直向上为y轴正方向建立平面直角坐标系,求出抛物线对应的函数表达式;
(2)工人师傅现需要一块边长为
的正方形木板,为了切割方便,要求一边在底部边缘
上,这块余料能否满足工人的需求?如果能,请说出切割方案,如果不能,请说明理由;
(3)若切割成矩形,要求一边在底部边缘
上且周长最大,求此矩形的周长;
(4)若切割成宽为
的矩形木板若干块,然后拼接成一个宽为
的矩形,如何切割才能使拼接后的矩形的长边最长?请直接写出拼接后的矩形的长边长(结果保留根号).注意:思考中可能会用到的数据
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b178474bc9008e83b4661dcfbf4e87b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29dc67d489b45471e5179e543649e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)工人师傅现需要一块边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e6cc70babacf10168a738b90a1aec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若切割成矩形,要求一边在底部边缘
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(4)若切割成宽为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da9429d1238ea3e979dd0de49dd2b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da9429d1238ea3e979dd0de49dd2b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3180e6cef57558978128081f259bd9fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d92accf6e50007ee4b73b16487f78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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5 . 如图,某农户计划用篱笆围成一个矩形场地养殖家禽,为充分利用现有资源,该矩形场地一面靠墙(墙的长度为
),另外三面用篱笆围成,中间再用篱笆把它分成三个面积相等的矩形分别养殖不同的家禽,计划购买篱笆的总长度为
,设矩形场地的长为
, 宽为
, 面积为
.
(2)当x为何值时,矩形场地的总面积最大?最大面积为多少?
(3)若购买的篱笆总长增加
,矩形场地的最大总面积能否达到
若能,请求出x的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c857aaa8fc6074c0d499298451e4e737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e084ae38a5dc1db3c411b5fd3787b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7f771ee0caa0143663939cb00451de.png)
(2)当x为何值时,矩形场地的总面积最大?最大面积为多少?
(3)若购买的篱笆总长增加
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea92883fe24b097c9a881ef8c92eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8efcf848e40683b1b608aac62062a09.png)
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6 . 【综合与实践】
矩形种植园最大面积探究
【解决问题】
根据分析,分别求出两种方案中S的最大值;比较并判断矩形种植园的面积最大值为多少?
矩形种植园最大面积探究
情境 | 劳动实践基地有一长为12米的墙![]() ![]() ![]() |
|
分析 | 要探究面积S的最大值,首先应将另一边![]() | |
探究 | 方案一:将墙![]() 按图1的方案围成矩形种植园(边 ![]() ![]() | |
方案二:将墙![]() 按图2的方案围成矩形种植园(墙 ![]() ![]() |
根据分析,分别求出两种方案中S的最大值;比较并判断矩形种植园的面积最大值为多少?
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2024-06-16更新
|
0次组卷
|
4卷引用:2024年山东省济宁市曲阜市中考二模数学试题
2024九年级下·全国·专题练习
7 . 在平面直角坐标系中,O为原点,
是等腰直角三角形,
,点
,点B在第一象限,点P在边
(点P不与点O,A重合),过点P作
,交
的直角边于点Q,将线段
绕点Q逆时针旋转
得到线段
,点P的对应点为M,连接
.
上,点B的坐标是 ,点M的坐标是 ;
(2)设
与
重合部分面积为S,
.
①如图②,若重合部分为四边形
,与边
交于点E,F,试用含t的式子表示S,并直接写出t的取值范围;
②当
时,求S的取值范围.(请直接写出结果即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66de81385e9afd8e180f1f156607cd01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c905c723e30f28088fd7f7dc09ef1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c51451b51ae800f80b405a93c8bce62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6927cc2a930203ac34366383e76ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99675fa03da205c4499967c9d908412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8070045849428341cc37653339f3713.png)
①如图②,若重合部分为四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3534df651f0a681bc905795b26833107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2c8d96a1bfdc807dd5f51672d59b0f.png)
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8 . 某校九年级学生在数学社团课上进行纸盒设计,利用一个边长为
的正方形硬纸板,在正方形纸板的四角各剪掉一个同样大小的小正方形,将剩余部分折成一个无盖纸盒.
,则剪掉的小正方形的边长为多少?
(2)折成的无盖纸盒的侧面积是否有最大值?如果有,求出这个最大值和此时剪掉的小正方形的边长;如果没有,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3668a3f3ce5b8a272ad92c2ebd233f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca959ab76aa580e1bf627ac5a7497bc8.png)
(2)折成的无盖纸盒的侧面积是否有最大值?如果有,求出这个最大值和此时剪掉的小正方形的边长;如果没有,说明理由.
您最近一年使用:0次
9 . 对于抛物线
,我们发现其图像上任意一点到点
的距离和到直线
的距离总是相等,于是规定点
为抛物线的焦点,直线
为抛物线的准线.
例如:如图
,
,其焦点为
,准线为直线
,抛物线上任意一点
到准线的距离为
,则
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7c498fef371d208d0494781144d75a.png)
,即
;同理可得
时,
也成立.利用焦点和准线的性质解决下列问题:
的焦点和准线;
(2)如图
,已知抛物线
的焦点为
,其准线与
轴交于点
,过焦点
的直线与抛物线交于
两点,求证:
;
(3)已知抛物线
,焦点为
,点
为对称轴右侧的抛物线上一点,
且
,
①求
的值;
②过焦点
的直线与该抛物线交于
两点,
为抛物线准线上一点,当
为等边三角形时,求直线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f257f6b86030d866857d10ec433ef75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce43981e5251e382690797f24907de2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af31a8d791f28399fc13be3250136dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce43981e5251e382690797f24907de2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af31a8d791f28399fc13be3250136dc.png)
例如:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dcc5c8d58dfa320ba55357e41264835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6991563453cd366d99513c393d1ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af31a8d791f28399fc13be3250136dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ee82573986d4fa6a7ee1b5f397edae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9008681dcd66e81c4522752bdac78738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7c498fef371d208d0494781144d75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7737f5fea52d07a57541a93ea717f9ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1c5fadd549fc5f6c685baba575a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1c5fadd549fc5f6c685baba575a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73e44af07b6d5fa478ce4bef18836bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f290023b1a8651d4a4c110bf7c4bab33.png)
(3)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1d6564041aa10021afaeee8539118c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0dd5fbc60c15aebf71d23765f804d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65704d24c9ba7271d59833f675be553e.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
②过焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
10 . 问题提出
如图,在矩形
中,
,
.在
上取一点
,
,点
是
边上的一个动点,以
为一边作四边形
,使点
落在
边上,点
落在矩形
内或其边上.
是正方形时,
的长为______,
的面积为______;
(2)如图②,当四边形
是菱形时,若
,
的面积为
.求
与
之间的函数关系式;
问题解决
(3)如图③,正方形
是某小区旁一块边长为100米的空地,为了提升附近居民的生活环境,现要把这块空地及其周边打造成一个生态公园.按设计要求,
为广场区域,正方形
是休息区,
是儿童娱乐区,
,点
在
边的延长线上,为满足各区域及绿化用地,想让广场的面积尽可能小.请问是否存在符合设计要求的面积最小的三角形广场
?若存在,求
面积的最小值及这时点
到点
的距离;若不存在,请说明理由.
如图,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39f31a107039ce5fdf44f6f33fc3744.png)
(2)如图②,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617345f55a92ef7e03e11a7f9f174e30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39f31a107039ce5fdf44f6f33fc3744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
问题解决
(3)如图③,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6ca93d868b56ce9e2f752ec264eabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9206d36ef2bce6e6bfce5669f0fb6d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daee8baa62b5b8d5db41eab0d360ee51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbed195d680cddc98a64e3d8258e6d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6ca93d868b56ce9e2f752ec264eabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次