已知:平行四边形
的两边
的长是关于方程
的两个实数根.
(1)当m为何值时,平行四边形
是菱形?并求出此时菱形的周长.
(2)若
,那么平行四边形
的周长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfaf5a8f4d31d611b86385af38f20a0.png)
(1)当m为何值时,平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2020-12-09 10:16:51
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相似题推荐
解答题-问答题
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【推荐1】已知
,
关于
的方程
的两个实数根.
(1)若
时,求
的值;
(2)若等腰
的一边长
,另两边长为
、
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23f8eefed209534de5376baca556737.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e788c32187ae2cc97aaa24da1d40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a977414a3ad65caf5eee28e0cd175de.png)
(2)若等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐2】(1)解方程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e758ff84ef212246e8dbf4e26a38d296.png)
(2)解方程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e96a65de08e3daf4a4149de1bdae927.png)
(3)已知
、
是关于
的一元二次方程
的两个实数根.
①若
,求
的值;
②已知等腰三角形
的一边长为7,若
、
恰好是
另外两边的长,求这个三角形的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e758ff84ef212246e8dbf4e26a38d296.png)
(2)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e96a65de08e3daf4a4149de1bdae927.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405e41bd81acc74aec5620f573e3c690.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a434a2ae1b88c35b24966576ba6c643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②已知等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知关于x的方程
.
(1)当m取何值时,方程有两个实数根?
(2)设
、
是方程的两根,且
,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d49e875656d12e52f1e4f412cd75ac8.png)
(1)当m取何值时,方程有两个实数根?
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e0822a6e590e2fbf605f8dc55ce8ac.png)
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名校
【推荐2】已知
,
.
当
时,求出使等式
成立的实数
;
若关于
的方程
有实数根,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238296130297c85cdab77531dc9afdc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a041a38b42392ac684b413abd0227c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9dfde5623366de792e101c74146ee4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efa934f1e4e84e22473e1aa9e6edfcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b61ed9fd6fbfbea7a406c80a7b92df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4120be2de053c4ef0f9d4b526aabfd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b61ed9fd6fbfbea7a406c80a7b92df8.png)
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【推荐1】白龙蓝莓基地计划将如图所示的一块长
米,宽
米的矩形空地划分成五块小矩形区域,其中一块正方形空地为育苗区,另一块空地为存储区,其余空地为种植区,分别种植A,B,C三种不同品种的蓝莓.存储区的一边与育苗区等宽,另一边长是
米,A,B,C三种蓝莓每平方米的产值分别为
元、
元、
元.
(1)设育苗区的边长为
米,用含x的代数式分别表示下列各量:A品种的种植面积是______米2,B品种的种植面积是______米2,C品种的种植面积是______米2;
(2)育苗区的边长为多少时,A,C两种蓝莓的总产值相等;
(3)若A,B两种蓝莓的种植面积之和不超过
米2,求A,B,C三种蓝莓的总产值之和的最大值是多少百元.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b685c556cc423e4833c1dc671a134cc.png)
品种C | 品种A | |
育苗区 | 品种B | 存储区 |
(1)设育苗区的边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)育苗区的边长为多少时,A,C两种蓝莓的总产值相等;
(3)若A,B两种蓝莓的种植面积之和不超过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead37777768a22b974a5c713c6c8333f.png)
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【推荐2】如图,要建一个长方形的养鸡场,养鸡场的一边靠墙(墙长
),另三边用木栏围成,木栏长![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4053cc2a31e9703bf80b62b5ea18c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/39e331db-bcec-4bb9-b799-135320358ef1.png?resizew=184)
(1)养鸡场的面积要达到
,应怎样围木栏?
(2)养鸡场的面积能达到
吗?如果能,请你给出设计方案,如果不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4053cc2a31e9703bf80b62b5ea18c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/39e331db-bcec-4bb9-b799-135320358ef1.png?resizew=184)
(1)养鸡场的面积要达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6434f3f0062e36128f7d6a55478382a1.png)
(2)养鸡场的面积能达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6307c0249ba768c1c0c9a253c31720d2.png)
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【推荐3】项目式学习:
项目主题 | “亚运主题”草坪设计 |
项目情境 | 迎亚运,展风采,同学们正在参与一块长为40米,宽为30米的矩形“亚运主题”草坪方案设计的项目学习,以下为项目学习小组对草坪设计的研究过程. |
活动任务一 | 请设计两条相同宽度的小路连接矩形草坪两组对边,小组内同学们设计的方案主要有甲、乙、丙、丁四种典型的方案. |
驱动问题一 | (1)项目小组设计出来的四种方案小路面积S甲,S乙,S丙,S丁的大小有何关系? |
活动任务二 | 为施工方便,学校选择甲种方案设计,并要求除小路后草坪面积约为1064平方米. |
驱动问题二 | (2)请计算小路的宽度是多少? |
活动任务三 | 为了布置设计好的杭州亚运元素,同学们打算建一个面积为6000m2的矩形油菜花田![]() |
驱动问题三 | (3)数学之星小明查阅资料发现:短边为长边的0.618倍的矩形称为黄金矩形,黄金矩形能够给画面带来美感,令人愉悦. 为了使长220米的篱笆恰好用完同时围住花田的三面,且矩形的形状更接近黄金矩形. ![]() |
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【推荐1】在菱形
中,
,点
和点
分别是射线
和射线
上的点(不与
,
重合),且
.
(1)问题初现
如图1,当点
和点
分别在线段
和线段
上(不与端点重合)时,线段
,
,
之间的数量关系是_________;
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506416805732352/2507168698998784/STEM/8c04ba33-6618-4e2d-8f36-4570e9c7d169.png?resizew=249)
(2)深入探究
如图2,当点
和点
分别在线段
和线段
的延长线上(不与端点重合)时,线段
,
,
之间有怎样的数量关系?请说明理由;
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506416805732352/2507168698998784/STEM/1becb871-7502-484d-b463-739e5b315032.png?resizew=276)
(3)拓展应用
在(2)的条件下,若
,且
,则
_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/11872bd228050e0af8764dfa77394341.png)
(1)问题初现
如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506416805732352/2507168698998784/STEM/8c04ba33-6618-4e2d-8f36-4570e9c7d169.png?resizew=249)
(2)深入探究
如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506416805732352/2507168698998784/STEM/1becb871-7502-484d-b463-739e5b315032.png?resizew=276)
(3)拓展应用
在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbde67cc84757b10bb66c47cee22de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e80bb0f244f283cd4c3faf809ba488d.png)
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解答题-作图题
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【推荐2】(1)如图△ABC,请在边BC、CA、AB上分别确定点D、E、F,使得四边形BDEF为菱形,请作出菱形BDEF.(要求尺规作图,保留作图痕迹,标注相应字母,不写作法)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958742805168128/2959358443151360/STEM/92b128c8-89a2-4905-ba1c-6e3f1e70622b.png?resizew=319)
(2)若△ABC中,AB=10,BC=15,求(1)中所作菱形BDEF的边长.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958742805168128/2959358443151360/STEM/92b128c8-89a2-4905-ba1c-6e3f1e70622b.png?resizew=319)
(2)若△ABC中,AB=10,BC=15,求(1)中所作菱形BDEF的边长.
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