为了有效预防和控制疫情,及时监测疫情发展态势,实施定期核酸检测.某社区准备搭建一个动态核酸检测点,现有33米可移动的隔离带,搭围成如图的临时检测点,这是一个一面靠墙(墙面为
)的矩形,内部分成两个区,M区为登记区,N区为检测区,入口通道在
边上,两区通道在
边上,出口通道在
边上,通道宽均为1米.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/e4a209ad-bac1-4796-8975-f71af69e8b62.png?resizew=177)
(1)若设
米,则
可表示为 ;
(2)问所围成矩形
的面积能否达到96平方米?如果能,求出
的长;如果不能,说明理由;
(3)检测点使用一天后,发现检测点面积需要扩大,问现有的33米隔离带,能否围出147平方米的面积?如果能,请说明理由;如果不能,请求出能围出的最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/e4a209ad-bac1-4796-8975-f71af69e8b62.png?resizew=177)
(1)若设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)问所围成矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)检测点使用一天后,发现检测点面积需要扩大,问现有的33米隔离带,能否围出147平方米的面积?如果能,请说明理由;如果不能,请求出能围出的最大面积是多少?
更新时间:2024-04-07 16:56:15
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【推荐1】用
张长为
,宽为
的长方形纸片按如图方式放在大长方形
内,未被覆盖的部分恰好为两个长方形,设阴影部分的周长为
,
的长为
,即
.
(1)求
(用含x的式子表示);
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284af25442151243df744528fe9ce188.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/3e9101e7-820d-44cf-ab0c-8828fd33a6a3.png?resizew=160)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e435815e95a0259bb31f0d475acef6c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf8c2a854fb16bfa150ccf1ce293cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】某校在基地参加社会实践活动中,带队老师考问学生:基地计划新建一个矩形的生物园地,一边靠旧墙(墙足够长),另外三边用总长69米的不锈钢栅栏围成,与墙平行的一边留一个宽为3米的出入口,如图所示,如何设计才能使园地的面积最大?有两位学生对此产生了争议.请根据信息,解决问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/67b4215d-9c91-400b-b6a1-49797e0b222a.png?resizew=325)
(1)设
米,试用含x的代数式表示
的长;
(2)请你判断谁的说法正确,为什么?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/67b4215d-9c91-400b-b6a1-49797e0b222a.png?resizew=325)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e1dbdca5a7bb6d9085fef086b1a2026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)请你判断谁的说法正确,为什么?
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名校
【推荐3】§5.2图形的运动,我们知道了平移、翻折、旋转和它们的组合运动,请用所学知识解决问题:
(1)图1,在直角三角形
中,
,正方形
的顶点D、E、F分别在
边上,
,
,求阴影部分面积?
解:将直角三角形
绕点E逆时针旋转
,阴影部分面积为 .
(2)图2,三角形
和三角形
都是等腰直角三角形,
,
,
,
,
,求阴影部分面积?
解:将等腰直角三角形
和等腰直角三角形
沿
所在直线翻折,阴影部分面积为 .
(3)图3,长为m,宽为n的长方形地上,修建两条宽都为1,且互相垂直的道路,剩下的部分都种上草,则草地的面积为 .
(4)图4,直角三角形
和直角三角形
中,
,
,
,
,阴影部分面积为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/04380551-2f4b-4a1f-ac3e-6a68e4ffc5ae.png?resizew=693)
(1)图1,在直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06786f33a8d0377b61d27b473ccf38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
解:将直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
(2)图2,三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902fc73a38725b9cb3835f3a5f6f04b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25dac48de0aa6b3bca92bcf307cd1aa.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e47bb98258ebfcf1d8ad4bac10b7ba.png)
解:将等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)图3,长为m,宽为n的长方形地上,修建两条宽都为1,且互相垂直的道路,剩下的部分都种上草,则草地的面积为 .
(4)图4,直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e47bb98258ebfcf1d8ad4bac10b7ba.png)
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【推荐1】有一块长为
,宽为
的矩形鲜花实验基地,准备修筑同样宽的三条直路(如图)把基地分成大小相等的六块作为试验田,种植不同品种的郁金香,要使试验田的面积为
,求道路的宽.
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【推荐2】某社区在开展“美化社区,幸福家园”活动中,计划利用如图所示的直角墙角(阴影部分,两边足够长),用50米长的篱笆围成一个矩形花园
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,
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【推荐1】某家禽养殖场,用总长为
的围栏靠墙(墙长为
)围成如图所示的三块矩形区域,矩形
与矩形
面积都等于矩形
面积的一半.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/d6b43f4d-8929-4bde-b463-45c70d68b9e9.png?resizew=158)
(1)求当
为何值时,矩形区域
的面积为
:
(2)矩形区域
的面积可能为
吗?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba52ced0811df98fedb575535b24257b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d690befd9571e1cf9a80388ab2b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474fa6f237d904bf46238e4fe3a59d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4923385f9ef2e9e3b4df8ca62579e634.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/d6b43f4d-8929-4bde-b463-45c70d68b9e9.png?resizew=158)
(1)求当
![](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/918e0fcb0ad788589cc3acab37d0e308.png)
(2)矩形区域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52be556e7fa0d2a9b8abafed2b061af5.png)
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【推荐2】为了有效预防和控制疫情,及时监测疫情发展态势,实施定期核酸检测.某社区准备搭建一个动态核酸检测点,现有33米可移动的隔离带,围成如图的临时检测点,这是一个一面靠墙(墙面为
)的矩形,内部分成两个区,
区为登记区,
区为检测区,入口通道在
边上,两区通道在
边上,出口通道在
边上,通道宽均为1米.设
,矩形
的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/fab130fc-cbdf-4593-9dc1-5ce3402715a8.png?resizew=263)
(1)
可表示为________;
(2)当
为何值时,
有最大值?最大值是多少?
(3)所围成矩形
的面积能否达到96平方米?如果能,求出
的长;如果不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595044a7750ab4f84519041979c3d780.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/fab130fc-cbdf-4593-9dc1-5ce3402715a8.png?resizew=263)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595044a7750ab4f84519041979c3d780.png)
(3)所围成矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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