【问题】(1)如图1,四边形
是正方形,点
是
边上的一个动点,以
为边在
的右侧作正方形
,连接
、
,则
与
的数量关系是______,
与
的位置关系是______;
(2)如图,四边形
是矩形,
,
,点
是
边上的一个动点,
【探究】①如图2,以
为边在
的右侧作矩形
,且
,连接
、
,求证:
;
【拓展】②如图3,以
为边在
的右侧作正方形
,连接
、
,则
面积的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【探究】①如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13458f8259fd95e92dad787e91571a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a987dd51f99d58c731c596c78dcd7e.png)
【拓展】②如图3,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ad83f1a3262048cba0e650b63e929.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/32610709-e97c-4af0-aaa4-9d1be8cccafa.png?resizew=455)
更新时间:2024-04-03 22:44:17
|
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解答题-问答题
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【推荐1】如图,某农场要建一个矩形的菜园,菜园的一边
靠墙(墙长5m),另外三边
,
,
用木栏围成,木栏长8m.
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(1)求菜园的面积能达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cbadc94d4650c757e2db089879c9f1.png)
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【推荐2】如图,要设计一副宽12cm、长20cm的图案,其中有两横两竖的彩条,横、竖彩条的宽度比为3:2.设每条竖彩条的宽度为2xcm,图案中四条彩条所占面积的和为ycm2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/70c6e4db-2fec-4d34-9c0a-8a163fe20625.png?resizew=157)
(1)求y与x之间的函数关系式,并写出x的取值范围;
(2)当x不小于0.5cm,不大于1.5cm时,求y的最大值;
(3)童威现在需要制作100张这样图案的卡片,其中彩条部分制作费用为15元/m2,其余部分制作费用为10元/m2,购买材料的总费用为31.2元(不计损耗),直接写出x的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/70c6e4db-2fec-4d34-9c0a-8a163fe20625.png?resizew=157)
(1)求y与x之间的函数关系式,并写出x的取值范围;
(2)当x不小于0.5cm,不大于1.5cm时,求y的最大值;
(3)童威现在需要制作100张这样图案的卡片,其中彩条部分制作费用为15元/m2,其余部分制作费用为10元/m2,购买材料的总费用为31.2元(不计损耗),直接写出x的值.
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解题方法
【推荐1】点
为
外一点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/1187423f-008a-40e1-b4cb-ec912c1efa5a.png?resizew=477)
(1)如图1,
,
,求证:
;
(2)如图2,若
,
,
,求证:
;
(3)如图3,若
,
,
,请直接用含
的式子表示
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/1187423f-008a-40e1-b4cb-ec912c1efa5a.png?resizew=477)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eba7e2cb2e2390673b83bde332973d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b9113bdd92db05d2a9a292356327ba.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700d23ec3e0d73c7a576b5f4b3b8a6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab47a785e0687f42e885e11497b7e969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6d946ec5bc75341f7e5fe400054464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04036fcf8f1f6d8d3a1050456e681b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63fa985f668796640ee33c05f1110cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】(1)如图1,△ACB与△ECD都是等腰直角三角形,△ACB的顶点A在△ECD的斜边DE上.
①已知AC=2,求AB的长度;
②求证:
;
(2)如图2,在等腰Rt△ABC中,∠BAC=90°,D为线段BC上一点,连接AD.求证:
.
①已知AC=2,求AB的长度;
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5fa5a04c0dd36a41b20ebed78270a2.png)
(2)如图2,在等腰Rt△ABC中,∠BAC=90°,D为线段BC上一点,连接AD.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67e3b63a0a8175ceb7115167f38ce300.png)
![](https://img.xkw.com/dksih/QBM/2022/9/10/3063334502522880/3067744174063616/STEM/774c17d7e99b494496fc349e85da8e18.png?resizew=430)
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【推荐1】如图,在正方形ABCD外取一点E,连接AE,BE,DE.过点A作AE的垂线交DE于点P,若AE=AP=1,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/fc0302c3-655a-4ee1-96a4-7aa82cef41b1.png?resizew=159)
(1)求证:
.
(2)求点B到直线AE的距离.
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dcba0c73b994832543511e2a1681ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/fc0302c3-655a-4ee1-96a4-7aa82cef41b1.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14780f34835709e206846a5ed75162c1.png)
(2)求点B到直线AE的距离.
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e124c39ca78fe1e44e800d22552f8c7.png)
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名校
【推荐2】如图,
是
的直径,
切
于点
,点
是
上的一个动点(点
不与
,
两点重合),连接
,过点
作
交
于点
,过点
作
于点
,交
的延长线于点
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/15873692-a13b-4718-bd40-38634823d6d4.png?resizew=202)
(1)求证:直线
为
的切线;
(2)若直径
的长为4.
①当
________时,四边形
为正方形;
②当
________时,四边形
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0fffe123ea158094a6d7ea645a58b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815d1ce1ba84bac399c8b20e074cf045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/15873692-a13b-4718-bd40-38634823d6d4.png?resizew=202)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75158101661ac908d605abfe2048226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2617150456f2b2eeab0b991d559babb.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75158101661ac908d605abfe2048226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6693d753544b8381f7ec77af5a77bc.png)
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【推荐1】根据题意,解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/f10d73cc-7f49-4af9-99cb-0a8e87df764c.png?resizew=432)
(1)已知
是等边三角形
的外接圆,
的半径为r,等边三角形
边长为a,求r与a的比值;
(2)已知
是等腰三角形
的外接圆,D,E分别是
的中点,
,
,求O到
的距离;
(3)已知
是等腰三角形
的外接圆,D,E分别是
的中点,直线
交
于F,G,且D,E是线段
的三等分点;
①若
,求
的值;
②
与
的比值是否为定值,若是请直接写出答案,若不是请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/f10d73cc-7f49-4af9-99cb-0a8e87df764c.png?resizew=432)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e865141c0f519d944198bebb99d2dfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eccb33ea66c03222468628f74d8c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e865141c0f519d944198bebb99d2dfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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