如图①,一块材料的形状是锐角三角形
,边
,高
,要把它加工成正方形零件,使正方形的一边在BC上,其余两个顶点分别在边
,
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/1b7c7696-7bf2-4584-a2ac-8df231b1abbf.png?resizew=381)
(1)加工成的正方形零件的边长是多少?
(2)如果原题中要加工成一个矩形零件,且此矩形可由两个大小相同的正方形并排放置组成,如图②,则这个矩形零件的长和宽分别是多少?
(3)图③,如果把这块材料形状改为
的斜板,已知
,
,
,要把它加工成一个形状为平行四边形
的工件,使
在
上,P、N两点分别在
,
上,且
,则平行四边形
的面积为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf57eef2bac6f23b54d87bd128fac25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b268b2129e91d0af3423f2c001653d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/1b7c7696-7bf2-4584-a2ac-8df231b1abbf.png?resizew=381)
(1)加工成的正方形零件的边长是多少?
(2)如果原题中要加工成一个矩形零件,且此矩形可由两个大小相同的正方形并排放置组成,如图②,则这个矩形零件的长和宽分别是多少?
(3)图③,如果把这块材料形状改为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77df7ac23dd5c286c3b32a45f4791e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a361722688f17c9b8bae311abf6b74a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e5fc12016a63cc49577ffebeab6ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c970f1ff55a73e2e2f77a6b509034950.png)
更新时间:2024-01-09 19:19:17
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【推荐1】如图,在面积为3的△ABC中,AB=3,∠BAC=45°,点D是BC边上一点.
(1)若AD是BC边上的中线,求AD的长;
(2)点D关于直线AB和AC的对称点分别为点M、N,求AN的长度的最小值;
(3)若P是△ABC内的一点,求
的最小值.
(1)若AD是BC边上的中线,求AD的长;
(2)点D关于直线AB和AC的对称点分别为点M、N,求AN的长度的最小值;
(3)若P是△ABC内的一点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f068c248d734498fb0cc2a6f94c8ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/a3e4be3f-8096-40be-a47a-7bdf48075a68.png?resizew=162)
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【推荐2】如图,抛物线y=﹣x2+3x+4与x轴交于A,B两点(点A位于点B的左侧),与y轴交于C点,抛物线的对称轴l与x轴交于点N,长为1的线段PQ(点P位于点Q的上方)在x轴上方的抛物线对称轴上运动.
(2)求CP+PQ+QB的最小值;
(3)过点P作PM⊥y轴于点M,当
CPM和
QBN相似时,求点Q的坐标.
(2)求CP+PQ+QB的最小值;
(3)过点P作PM⊥y轴于点M,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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【推荐1】教材呈现:
(1)请根据教材提示,结合图1,写出完整的证明过程.
(2)初步探究:如图2,在四边形
中,
,
,
,
于点P,连接
,
.
①
的度数为 .
②求
的长.
(3)拓展运用:如图3,在平行四边形
中,F是
边上一点,
,
,
.按以下步骤作图:①以点B为圆心,以适当的长为半径作弧,分别交
,
于点M,N;②分别以点M,N为圆心,大于
的长为半径作弧,两弧交于点E,作射线
.过点F作
交
于点P,过点P作
于点G,Q为射线
上一动点,连接
,
,若
,直接写出
的值.
例:如图1,在![]() ![]() ![]() ![]() 求证: ![]() 证明:延长 ![]() ![]() ![]() ![]() …… ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/d4a32fc8-d05e-4ac8-98ad-67e61260e15c.png?resizew=573)
(1)请根据教材提示,结合图1,写出完整的证明过程.
(2)初步探究:如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45723dce96b74f027adcb1a4ecd19db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c5e7ab5a46dd74168a6555fd6bf6b6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)拓展运用:如图3,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d620c2be45414bb73c591aef51469271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d7566369c178316219bb466a66d062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e66b12019cdf68327d34c90dff7c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22072cf9e5d4259f8f51e5c94490bf93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013d609ef2ded6729da96280cc95fdac.png)
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【推荐2】某工厂加工车间要从一块四边形钢板
中切割一个正方形,已知
米,
米,
米,
.如图,现有方案1和方案2两种切割方案,图中的正方形
和正方形
四个顶点都在原四边形的边上.
(1)求
的长;
(2)求
的值;
(3)若在
余料上再切割一个最大正方形.请直接写出此正方形的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4b1fdfa6c28c7b4113ba306547aa4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fec9e3bf7ff287df2cbdff8addfaf5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/ac440455-ca80-4e78-b331-eeb5ba3e7934.png?resizew=285)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a6f8b9fbd756a58deccb765f2cb77e.png)
(3)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
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【推荐1】已知正方形ABCD与正方形CEFG,M是AF的中点,连接DM,EM.
![](https://img.xkw.com/dksih/QBM/2022/10/8/3083460945707008/3090999608451072/STEM/8af366408de2478c87529beea6e7dd22.png?resizew=496)
(1)如图1,点E在CD上,点G在BC的延长线上,直接写出DM,EM的数量关系与位置关系:___________(请用文字表达);
(2)如图2,点E在DC的延长线上,点G在BC上,(1)中结论是否仍然成立?请证明你的结论;
(3)如图3,连接BG,N为BG中点,若
,
,请求出MN的最大值.
![](https://img.xkw.com/dksih/QBM/2022/10/8/3083460945707008/3090999608451072/STEM/8af366408de2478c87529beea6e7dd22.png?resizew=496)
(1)如图1,点E在CD上,点G在BC的延长线上,直接写出DM,EM的数量关系与位置关系:___________(请用文字表达);
(2)如图2,点E在DC的延长线上,点G在BC上,(1)中结论是否仍然成立?请证明你的结论;
(3)如图3,连接BG,N为BG中点,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea13f8415e8da4513e6d450f5d95931d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5c397a8e1b933b3f64f09f63d7e7a0.png)
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【推荐2】在平面直角坐标系中,有
,
,点Q在
边上,过点Q作
于Q,且
,以PQ为边向右侧作正方形
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/587363a2-04b6-4e38-866a-5d788e62e51f.png?resizew=379)
(1)如图①,当点E与点A重合时,求t的值;
(2)如图②,当点E在点A右侧,且正方形
与
重叠部分为五边形时,边
与边
相交于点M,试用含有t的式子表示线段
的长,并直接写出t的取值范围;
(3)设正方形
与
重叠部分图形的面积为S.当
时,求S的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeb44ae7a6b4aaa90e1eb816b2af721.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/0f42a4a5045bc6de8b7c23d16f727bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3534df651f0a681bc905795b26833107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00c52a6196294d93e9b29dfdc51b837.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/587363a2-04b6-4e38-866a-5d788e62e51f.png?resizew=379)
(1)如图①,当点E与点A重合时,求t的值;
(2)如图②,当点E在点A右侧,且正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3534df651f0a681bc905795b26833107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
(3)设正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3534df651f0a681bc905795b26833107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea9584b2c1a203ad3e21ee9f712e3a2.png)
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解题方法
【推荐3】对于平面直角坐标系xOy中的点P和正方形给出如下定义:若正方形的对角线交于点O,四条边分别和坐标轴平行,我们称该正方形为“原点正方形”.当“原点正方形”上存在点Q,满足PQ≤1时,称点P为原点正方形的“友好点”.
(1)当“原点正方形”边长为4时,
①在点P1(0,0),P2(﹣1,1),P3(1,3),P4(3,3)中,“原点正方形”的“友好点”是 ;
②点P在直线y=x的图象上,若点P为“原点正方形”的“友好点”,求点P横坐标的取值范围;
(2)一次函数y=﹣x+2的图象分别与x轴,y轴交于点A、B,若线段AB上存在“原点正方形”的“友好点”,直接写出“原点正方形”边长a的取值范围.
(1)当“原点正方形”边长为4时,
①在点P1(0,0),P2(﹣1,1),P3(1,3),P4(3,3)中,“原点正方形”的“友好点”是 ;
②点P在直线y=x的图象上,若点P为“原点正方形”的“友好点”,求点P横坐标的取值范围;
(2)一次函数y=﹣x+2的图象分别与x轴,y轴交于点A、B,若线段AB上存在“原点正方形”的“友好点”,直接写出“原点正方形”边长a的取值范围.
![](https://img.xkw.com/dksih/QBM/2021/10/26/2837430500958208/2839624084037632/STEM/1a1b8a28-41aa-42e4-a304-c47fe65feeb4.png)
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【推荐1】如图,抛物线y=
交x轴于点A、B,交y轴于点C,点A的坐标是(-1,0),点C的坐标是(0,2).
![](https://img.xkw.com/dksih/QBM/2016/2/17/1573971637354496/1573971643645952/STEM/7b6e4f0a914447959ccd99cf22a53588.png)
(1)求该抛物线的解析式.
(2)已知点P是抛物线上的一个动点,点N在x轴上.
①若点P在x轴上方,且△APN是等腰直角三角形,求点N的坐标;
②若点P在x轴下方,且△APN∽△BOC,请直接写出点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd7a35a7e90610f4eb66c939c720a73.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1573971637354496/1573971643645952/STEM/7b6e4f0a914447959ccd99cf22a53588.png)
(1)求该抛物线的解析式.
(2)已知点P是抛物线上的一个动点,点N在x轴上.
①若点P在x轴上方,且△APN是等腰直角三角形,求点N的坐标;
②若点P在x轴下方,且△APN∽△BOC,请直接写出点N的坐标.
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【推荐2】如图,AC,BD为
的两条直径,连接AB,BC,
于点E,点F是半径OC的中点,连接EF.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2963077843034112/2964446530822144/STEM/f9f9f49e-8f80-4c41-a995-fb36196b81f6.png?resizew=326)
(1)若
,求证
.
(2)连接
,
,设
与
交于点
,
①求证:
.
②若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
![](https://img.xkw.com/dksih/QBM/2022/4/21/2963077843034112/2964446530822144/STEM/f9f9f49e-8f80-4c41-a995-fb36196b81f6.png?resizew=326)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b70c662d45c1b741ea5ed7a31007cc.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b30155e0e3cf7c5146d3311e5b8da93.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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解答题-问答题
|
较难
(0.4)
【推荐3】如图(1),在矩形DEFG中,DE=3,EG=6,在Rt△ABC中,∠ABC=90°,BC=3,AC=6,△ABC的一边BC和矩形的一边DG在同一直线上,点C和点D重合,Rt△ABC将从D以每秒1个单位的速度向DG方向匀速平移,当点C与点G重合时停止运动,设运动时间为t秒,解答下列问题:
(1)如图(2),当AC过点E时,求t的值;
(2)如图(3),当AB与DE重合时,AC与EF、EG分别交于点M、N,求CN的长;
(3)在整个运动过程中,设Rt△ABC与△EFG重叠部分面积为y,请求出y与t的函数关系式,并写出相应t的取值范围.
(1)如图(2),当AC过点E时,求t的值;
(2)如图(3),当AB与DE重合时,AC与EF、EG分别交于点M、N,求CN的长;
(3)在整个运动过程中,设Rt△ABC与△EFG重叠部分面积为y,请求出y与t的函数关系式,并写出相应t的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/5/29/1955674234011648/1956610400673792/STEM/d1303c6301e14bb6b8f31507a125a932.png?resizew=379)
您最近一年使用:0次