1 . 【问题提出】
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/137f9092-6f83-41ff-8fee-f556701c9907.png?resizew=419)
(1)如图1,在
中,
.请在
内画一个正方形,使得这个正方形一个内角为
,其余顶点落在
的边上;
【问题探究】
(2)如图2,
是锐角三角形,其中
,若要在
中做出一个平行四边形,使平行四边形一边
落在
上,另两顶点落在
上,请求出满足条件的平行四边形面积的最大值.
【问题解决】
(3)如图3,有一四边形
与
交于
,现要在四边形
中截出平行四边形
,使得平行四边形一边
与
平行,四个顶点
落在四边形
的四边上,当
时,求线段
的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/137f9092-6f83-41ff-8fee-f556701c9907.png?resizew=419)
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【问题探究】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb31aced57fab505d1dd215fcb31400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
【问题解决】
(3)如图3,有一四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d94651fcfd4fe8d51fdcdc9ab8a215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3d4815b230ab49048cf843dfaf62e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a343f11040d8a810edfebfbe324fa06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
2 . 一边靠墙(墙有足够长),其他三边用
米长的篱笆围成一个矩形花园,这个花园的最大面积是( )平方米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 用一段长为40m的篱笆围一个一边靠墙的矩形菜园,墙长25m,这个矩形的长、宽各是多少时,菜园的面积最大?最大面积是多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/8c77f751-0bbf-498a-9fa6-67bdd3328f60.png?resizew=237)
您最近一年使用:0次
4 . 如图,点
分别在菱形
的四条边上,
,连接
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/1398dc80-c805-4221-a634-fafe5b9dd7cb.jpg?resizew=181)
(1)求
的度数;
(2)判断四边形
的形状,并说明理由;
(3)设
,四边形
的面积为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c4e624ac63535bd4fd543c8d02005b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853c892b998723430003c0a647cba694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e1de301288653d39fd1c2c9b140a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae1f204e70e6a77d3d675670e69047a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/1398dc80-c805-4221-a634-fafe5b9dd7cb.jpg?resizew=181)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbc991515705da4bb9a3fc1888a1428.png)
(2)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e56e25b06e8512793b95b76d0d966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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5 . 如图,已知抛物线
对称轴为
,过其顶点
的一条直线
与该抛物线的另一个交点为
.要在坐标轴上找一点
,使得
的周长最小,则点
的坐标为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4fac8a0cd2238213b422f5d6be1606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba53065eb180a682305fddb95d14b62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5229781ae74407f4a432c10aae26de7.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/03ca96b1-1788-4af2-af9f-3f387b1346a1.png?resizew=143)
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6 . 如图,用18米长的木方条做一个有一条横档的矩形窗子,窗子的宽
不能超过2米. 为使透进的光线最多,求:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/20739891-66ca-4d02-9937-23b683cd3617.png?resizew=86)
(1)则窗子的长多少米?
(2)并求出最大透光面积.(横柱遮光忽略)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/20739891-66ca-4d02-9937-23b683cd3617.png?resizew=86)
(1)则窗子的长多少米?
(2)并求出最大透光面积.(横柱遮光忽略)
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7 . 如图∶有一农户要建一个矩形鸡舍,鸡舍的一边利用长为
米的墙,另外三边用
米长的篱笆围成,为方便进出,在垂直于墙的边
上留一个1米宽的门.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/68d06384-ee04-4fec-9a10-69114e60c832.png?resizew=150)
(1)矩形的边
与
长度分别为多少时,鸡舍面积为
平方米?
(2)若住房墙的长度足够长,问鸡舍面积能否达到
平方米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7f959148f8da15d2a4a4ceb30745df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436dde5d8ac0232d980cc64d8c4525c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/68d06384-ee04-4fec-9a10-69114e60c832.png?resizew=150)
(1)矩形的边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fff35cf1ffeef5fa1e7ad51d849ef0.png)
(2)若住房墙的长度足够长,问鸡舍面积能否达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b7224a161bdc3f12cf8546017550f0.png)
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8 . 如图,点E,F,G,H分别在边长为6的正方形
的四条边上运动,四边形
也是正方形.
(1)求证:
;
(2)设
的长为x,正方形
的面积为y,求y关于x的函数解析式;
(3)在(2)的条件下,当
的长为多少时,正方形
的面积最小?最小值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/a2858408-aebd-4bda-94f1-46427ae4031a.png?resizew=108)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882a20cab5eeb64f9fcbc69999eff1aa.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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9 . 在美化校园活动中,某兴趣小组想借助如图所示的直角墙角(两边足够长),用
长的篱笆围成一个矩形花园
(篱笆只围
两边),设
,若在
处有一棵树与墙
的距离分别是
和
,要将这棵树围在花园内(含边界,不考虑树的粗细),则花园面积
的最大值为__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2fc57da7f8399eae9ad9ad22ca836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667f534c3893e5dcfe16be356202971a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ed6733d050011b9c484981ced7ccfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6a2cd5c500b7eaa4eb378d59bf0abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1e0bd4fe8afb14b572852121cef83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/a8b4bed0-6f4e-468b-afc5-cebb8b400064.png?resizew=155)
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10 . 如图所示,某居民小区要在一块一边靠墙的空地上修建一个矩形花园
,花园的一边靠墙,另三边用总长为
的栅栏围成(墙长
).若设
为x,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/d5eb4551-ecdb-4309-8824-0b44c1c41a9b.png?resizew=143)
(1)用含x的代数式表示
的长;
(2)满足条件的花园面积能达到
吗?若能,求出此时x的值,若不能,说明理由;
(3)满足条件的花园面积能达到
吗?若能,求出此时x的值,若不能,说明理由;
(4)求x为何值时,矩形
的面积最大,最大面积为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c08094f72d5bd69246c453dd28e33d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae38efc350410ec3eda09de3a197e01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/d5eb4551-ecdb-4309-8824-0b44c1c41a9b.png?resizew=143)
(1)用含x的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)满足条件的花园面积能达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40cb83e0803eccaff3e88cfb2453a21.png)
(3)满足条件的花园面积能达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89d516eb2c6edf6c9ac967597f8235c.png)
(4)求x为何值时,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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