如图,在等边
中,点P是
上一点,点D是
上一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/3ef70229-ad46-4514-8400-f458cbf8fd3b.png?resizew=152)
(1)若
,
,求
的边长;
(2)若
,
,
,求y与x之间的函数关系,并求y的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cfb545e6f3a6d90eb36314676e0b55a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/3ef70229-ad46-4514-8400-f458cbf8fd3b.png?resizew=152)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d10f2db7289ff1ec65c47d9af77a9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddabaab6bfaa685bc476579919b50e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a666403569e607f32af5f762c246dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b52933ebe6bd7b863f748c01a84cc85.png)
2023九年级·全国·专题练习 查看更多[1]
(已下线)专题19 寻找或构建相似三角形的基本模型解决问题-2023年中考数学二轮复习核心考点专题提优拓展训练
更新时间:2023-03-14 18:00:26
|
相似题推荐
解答题-作图题
|
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【推荐1】已知二次函数y=﹣x2+2x+3
(1)在如图所示的坐标系中,画出该函数的图象
(2)根据图象回答,x取何值时,y>0?
(3)根据图象回答,x取何值时,y随x的增大而增大?x取何值时,y随x的增大而减小?
(1)在如图所示的坐标系中,画出该函数的图象
(2)根据图象回答,x取何值时,y>0?
(3)根据图象回答,x取何值时,y随x的增大而增大?x取何值时,y随x的增大而减小?
![](https://img.xkw.com/dksih/QBM/2017/9/6/1768347898912768/1768381262757888/STEM/59680b9086a74a27bcd4fafbb0d6bf42.png?resizew=246)
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【推荐2】已知二次函数
.
(1)请直接写出该抛物线的对称轴和顶点坐标,并求出抛物线与x轴的两个交点A,B(点A在点B的左边)的坐标;
(2)在所给的平面直角坐标系中,画出这个二次函数的直接画出图象即可);
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/dab7326d-8636-4783-9991-09804d9b8e6b.png?resizew=214)
(3)当
时,求出函数y的取值范围;
(4)把线段
先向上平移3个单位,再向右平移1个部位,得到线段
.当抛物线
与线段
恰好只有一个交点时,请直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3577b438717504fe2dcef0acf06ec86.png)
(1)请直接写出该抛物线的对称轴和顶点坐标,并求出抛物线与x轴的两个交点A,B(点A在点B的左边)的坐标;
(2)在所给的平面直角坐标系中,画出这个二次函数的直接画出图象即可);
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/dab7326d-8636-4783-9991-09804d9b8e6b.png?resizew=214)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
(4)把线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/664a8b6865eff19fec633da80420103d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
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解答题-问答题
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【推荐1】如下图,
中,三条内角平分线
相交于点
,
于点
.
![](https://img.xkw.com/dksih/QBM/2019/9/24/2297668195999744/2297753916350465/STEM/5b094ac92049484d9102a586811e6204.png?resizew=198)
(1)若
,
,求
和
的度数.
(2)若
,
,则
和
相等吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c42f73b6b4cd5308071e6bedb83049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbdaf6769ca790186718cc60c7b89ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2019/9/24/2297668195999744/2297753916350465/STEM/5b094ac92049484d9102a586811e6204.png?resizew=198)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb4dfd6ad0a4c2079eaa0a99091c4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7502eee6f33e8c940dec63ab6473c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5872ef44ce364d04622e28e1d6f9e39f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67a04ec500f0a63cbf83e439ce40d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5872ef44ce364d04622e28e1d6f9e39f.png)
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解答题-证明题
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名校
【推荐2】【问题探究】
(1)如图①,在正方形
中,点
在
上,点
在
上,
与
相交于点
,若
,求
的度数;
【问题解决】
(2)如图②,菱形
是某小区的一块空地,开发商准备对这块空地进行再利用,实地探测发现,
的延长线上有一个点
,现欲沿
修一条小路,并在小路
上找一点
,使得
,设计师的设计过程如下:
①以点
为圆心,
长为半径画弧,交
于点
;
②连接
,交
于点
.
请问,若按上述作法,作出的
是否符合要求?请证明你的结论.
(1)如图①,在正方形
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b2acb865af089b1c4f872c99106d6f.png)
【问题解决】
(2)如图②,菱形
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f244b0c74e6030526dfb46ca6bb4f0.png)
①以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
请问,若按上述作法,作出的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2b669a87f18866b2e9560f7fe1776d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/36c57d0d-9bbd-4184-b9f9-5fa27b6dc6e7.png?resizew=285)
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解答题-问答题
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【推荐1】(1)操作发现:如图①,点D是等边△ABC的边AB上一动点(点D与点B不重合),连接CD,以CD为边在CD上方作等边△CDE,连接AE,则AE与BD有怎样的数量关系?说明理由.
(2)类比猜想:如图②,若点D是等边△ABC的边BA延长线上一动点,连接CD,以CD为边在CD上方作等边△CDE,连接AE,请直接写出AE与BD满足的数量关系,不必说明理由;
(3)深入探究:如图③,点D是等边△ABC的边AB上一动点(点D与点B不重合),连接CD,以CD为边分别在CD上方、下方作等边△CDE和等边△CDF,连接AE,BF则AE,BF与AB有怎样的数量关系?说明理由.
(2)类比猜想:如图②,若点D是等边△ABC的边BA延长线上一动点,连接CD,以CD为边在CD上方作等边△CDE,连接AE,请直接写出AE与BD满足的数量关系,不必说明理由;
(3)深入探究:如图③,点D是等边△ABC的边AB上一动点(点D与点B不重合),连接CD,以CD为边分别在CD上方、下方作等边△CDE和等边△CDF,连接AE,BF则AE,BF与AB有怎样的数量关系?说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/26/2233925075197952/2235811661963264/STEM/d4404462144a4f71b37e87be0e0c4f50.png?resizew=463)
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解答题-证明题
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【推荐2】如图,四边形
是平行四边形,
的平分线交
边于点
、交
边的延长线于点
,过点
作
,过点
作
.
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
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【推荐1】如图,四边形
是矩形,
是
上的一点,
,
.点
是
、
延长线的交点,
与
相交于点
.
(1)求证:四边形
是正方形;
(2)当
,
时,求
的值.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b62617f3845f87e688c2cdf2bbc4c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2226397b9bdbc77087433b05fb61209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/bce71924-9504-41b5-a047-dbf55cd0405e.png?resizew=107)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93fd14603fafb45407feb3146155a17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faac29dffda6ed545dbebd016cc82185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
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【推荐2】如图,在△ABC中,D是BC边的中点,DE⊥BC交AB于点E,AD=AC,EC交AD于点F.
(1)求证:△ABC∽△FCD;
(2)求证:FC=3EF.
(1)求证:△ABC∽△FCD;
(2)求证:FC=3EF.
![](https://img.xkw.com/dksih/QBM/2018/12/27/2106049002184704/2108036449722368/STEM/e7c12fc49785403fac6151d9ea36f530.png?resizew=201)
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