一块三角形材料如图所示,
,
,
.用这块材料剪出一个矩形
,其中点
分别在
上.设
,
取何值时,使剪出的矩形
的面积最大,并求出矩形
的最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deee065ac8feb7ceb08a1cc47e1d48ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0124d4c22e17a6b719cf2d0f0b305e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/38381064-3390-4a0b-a148-efb2664cd1ad.png?resizew=84)
更新时间:2024-04-03 20:48:18
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【推荐1】如图,用
的篙色围成一个边靠墙的矩形场地,墙长
.垂直于墙的边长为
.围成的矩形场地的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/949f1f6f-dea8-47b0-851c-3d6bb5930250.png?resizew=164)
(1)求
与
的函数关系式,并写出自变量
的取值范围;
(2)求这个矩形场地面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c758c27bec97c234d1d818c40f3d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b749f9acb5f0de709a1709bbdd42614.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/949f1f6f-dea8-47b0-851c-3d6bb5930250.png?resizew=164)
(1)求
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求这个矩形场地面积的最大值.
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【推荐2】如图,用长为6m的铝合金条制成“日”字形窗框,若窗框的宽为xm,窗户的透光面积为ym2(铝合金条的宽度不计).
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583099007246336/2587323532615680/STEM/ad4a91156f474cd09ecd3ae40edc7d0c.png?resizew=90)
(1)求出y与x的函数关系式(结果要化成一般形式);
(2)能否使窗的透光面积达到2平方米,如果能,窗的高度和宽度各是多少?如果不能,请说明理由.
(3)窗的宽度为多少米时,窗户的透光面积最大?并求出此时的最大面积.
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583099007246336/2587323532615680/STEM/ad4a91156f474cd09ecd3ae40edc7d0c.png?resizew=90)
(1)求出y与x的函数关系式(结果要化成一般形式);
(2)能否使窗的透光面积达到2平方米,如果能,窗的高度和宽度各是多少?如果不能,请说明理由.
(3)窗的宽度为多少米时,窗户的透光面积最大?并求出此时的最大面积.
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【推荐1】如图,在矩形
中,对角线
与
相交于点
,
,
,
,垂足为
,
是
延长线上一点,且
.
![](https://img.xkw.com/dksih/QBM/2022/12/12/3129172552474624/3143423260491776/STEM/2e9da6e0867b4520bb9f476bbcacc3cd.png?resizew=248)
(1)求
,
的长;
(2)试判断点
是否为线段
的黄金分割点,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f4a6920a0dc269d5d1781e87fe84f1.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61eed81031088ad141dd5877a4bc858.png)
![](https://img.xkw.com/dksih/QBM/2022/12/12/3129172552474624/3143423260491776/STEM/2e9da6e0867b4520bb9f476bbcacc3cd.png?resizew=248)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)试判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】如图,P是OC上一点,PD⊥OA于D,PE⊥OB于E.F、G分别是OA、OB上的点,且PF=PG,DF=EG.
(1)求证:OC是∠AOB的平分线.
(2)若PF∥OB,且PF=8,∠AOB=30°,求PE的长.
(1)求证:OC是∠AOB的平分线.
(2)若PF∥OB,且PF=8,∠AOB=30°,求PE的长.
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542454503186432/2543488672301056/STEM/4719b1076ebe4ab7a07e99c1fec416cd.png?resizew=183)
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【推荐1】如图,一架长为5米的梯子AB斜靠在与地面OM垂直的墙ON上,梯子底端距离墙ON有3米.
(2)若梯子顶点A下滑1米到C点,求梯子的底端向右滑到D的距离.
(2)若梯子顶点A下滑1米到C点,求梯子的底端向右滑到D的距离.
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【推荐2】如图;在下列5×5的网格中,每个小正方形的顶点都称为格点,线段AB的两个端点均为格点,仅用无刻度的直尺在给定网格中画图,画图过程用虚线表示,画图结果用实线表示.
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(1)过点M画线段AB的垂线
(2)以AB为边画菱形ABCD,且面积为3,则较长的对角线长度是_________.
(3)在CD上找点Q,使CQ=AP.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/76881dbe-3869-46b5-9cfb-b02b9ae1256f.png?resizew=200)
(1)过点M画线段AB的垂线
(2)以AB为边画菱形ABCD,且面积为3,则较长的对角线长度是_________.
(3)在CD上找点Q,使CQ=AP.
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