名校
1 . 如图,有一个三角形的湿地公园,其中
,点D在
上,且
,点D为公园入口.为了方便游客观光,拟在
上选择一点E,在
上选择一点F,修建三条观光廊桥
,且要求
,设
.
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717388672458752/2802889470992384/STEM/d5b405b22484496e97b433f118010cda.png?resizew=227)
(1)当
变化时,求证:廊桥
与
的长度比值为定值;
(2)为节约修建成本,求三条廊桥长度和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43136f56e59f3f9e878d0c5d4ccbeecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49efa5eaff3ee56f13e121c1fc294eb0.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/aade83af002b001a9367c2226dcfcda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3bba5bd11e850c9b766c2ba6c426d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2132c3d137d2f80fabf328ddb09f8ff.png)
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717388672458752/2802889470992384/STEM/d5b405b22484496e97b433f118010cda.png?resizew=227)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)为节约修建成本,求三条廊桥长度和的最小值.
您最近一年使用:0次
名校
2 . 在
中,
分别为内角
的对边,已知
,且边
上的中线长为4.
(1)证明:
;
(2)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64c2ce9dd9e8f717f3767cb181c696e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2021-07-10更新
|
1032次组卷
|
3卷引用:浙江省浙东北联盟(ZDB)2020-2021学年高一下学期期中数学试题
浙江省浙东北联盟(ZDB)2020-2021学年高一下学期期中数学试题安徽省合肥市六校联盟2021-2022学年高一下学期期中数学试题(已下线)专题6.4 解三角形大题(中线问题)-2022届高三数学一轮复习精讲精练
3 . 如图.在平面四边形
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/f233fbe8-1418-4593-a3a2-a2453c724d9b.png?resizew=125)
(1)设
,证明
为定值.
(2)若
,记
的面积为
,
的面积为
.
,求S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50cfef119ed7a32f22546355225e60a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/f233fbe8-1418-4593-a3a2-a2453c724d9b.png?resizew=125)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e062b576227465b4512dd653c3f16d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b75a84c919154f4fcf4527b9af0f93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28df6038cf903a5b6b069ff0aec4ec0.png)
您最近一年使用:0次
2021-07-08更新
|
476次组卷
|
4卷引用:湖南省部分学校2020-2021学年高一下学期6月联考数学试题
湖南省部分学校2020-2021学年高一下学期6月联考数学试题安徽省皖八联盟2020-2021学年高一下学期统测数学试题河北省石家庄市2020-2021学年高一下学期第三次月考数学试题(已下线)模型2 四边形或多边形背景下的解三角形模型(高中数学模型大归纳)
解题方法
4 . 我国汉代数学家赵爽为了证明勾股定理,创制了一副“勾股圆方图”,后人称其为“赵爽弦图”.类比赵爽弦图,由3个全等的小三角形拼成如图所示的等边
,若
的边长为
﹐且
,则
的面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a61d4b2f327fd817c7df7f4fafa02a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722902761750528/2759990501122048/STEM/bbb8a429-3095-425d-829f-356bc10044b5.png?resizew=197)
您最近一年使用:0次
解题方法
5 . 某农场有一块等腰直角三角形的空地
,其中斜边
的长度为200米.为迎接“五一”观光游,欲在边界
上选择一点
,修建观赏小径
,
,其中
,
分别在边界
,
上,小径
,
与边界
的夹角都为
.区域
和区域
内种植郁金香,区域
内种植月季花.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/5c2a50d4-6b2b-416d-bbbc-e1a4064e5560.png?resizew=155)
(1)求证:
为定值;
(2)为深度体验观赏,准备在月季花区域内修建小径
,当
点在何处时,三条小径
的长度和最小?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b81fb655624ff75a5eab94de9b8c8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d62de810f5160223afa54fd882acb9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e6f84f2a5721303019f158d860cd5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/5c2a50d4-6b2b-416d-bbbc-e1a4064e5560.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
(2)为深度体验观赏,准备在月季花区域内修建小径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04026908af27f4846c1fc0e1b6e6c5b.png)
您最近一年使用:0次
名校
6 . 在平面四边形ABCD中,AB=1,BC=CD=2,AD=3.
(1)证明:3cosA-4cosC=1;
(2)记△ABD与△BCD的面积分别为S1,S2,求S12+S22的最大值.
(1)证明:3cosA-4cosC=1;
(2)记△ABD与△BCD的面积分别为S1,S2,求S12+S22的最大值.
您最近一年使用:0次
7 . 1.已知
,
,
分别是
的内角
,
,
所对的边,
,再从下面条件①与②中任选
个作为已知条件,完成以下问题.
(1)证明:
为锐角三角形;
(2)若
,
为
的内角平分线,且与
边交于
,求
的长.
①
;②
.
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6854a6cd346513255d11e5243428d4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c0fbe727baae0f605f4f1189307e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1469989af1c27f3ac325dc0b36489747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9011c4e2e3139a755d1d0df0363085.png)
您最近一年使用:0次
解题方法
8 . 如图,四边形
中,已知对角线
,且满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/d33946a3-23d7-4bc0-8ff3-30bca62729c4.png?resizew=146)
(1)求证:
;
(2)若△
为锐角三角形,设四边形
面积为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7355730155322ae2a9a0e397774b830a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/d33946a3-23d7-4bc0-8ff3-30bca62729c4.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90f7efe2f99f5cb6801841171feab6b.png)
(2)若△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ea27b72194b40ad10fb5f7e312099d.png)
您最近一年使用:0次
解题方法
9 . 设
的内角
、
、
的对边分别是
,
,
,
,且
为钝角.
(1)证明:
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7547e9ba4cc2787d8f9d59ecf1eb202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd2d90ed8b5f265bb5b0a8c84b4b743.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d218a405fae9905116d6587cb9396b.png)
您最近一年使用:0次
名校
解题方法
10 . 某中学新校区有一块形状为平面四边形
的土地准备种一些花圃,其中A,B为定点,
(百米),
(百米).
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722918803570688/2786170073800704/STEM/0ed2ca04d02a41a5ae4a8632048f6b8e.png?resizew=202)
(1)若
,
(百米),求平面四边形
的面积;
(2)若
(百米).
(i)证明:
;
(ii)若
,
面积依次为
,
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b09f34fb06ae90a8d7b1a25ea01645.png)
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722918803570688/2786170073800704/STEM/0ed2ca04d02a41a5ae4a8632048f6b8e.png?resizew=202)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0455a083abf9d84a558b84c510007325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
(i)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20dac2bf740366d4a80eab63e3d9acc3.png)
(ii)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be89b91f05f281190209b1e876299d57.png)
您最近一年使用:0次
2021-08-14更新
|
214次组卷
|
3卷引用:广东省顺德德胜学校2020-2021学年高一下学期期中数学试题
广东省顺德德胜学校2020-2021学年高一下学期期中数学试题(已下线)大题好拿分期中考前必做30题(压轴版)-2020-2021学年高一数学下册期中期末考试高分直通车(沪教版2020必修第二册)江西省宜春市铜鼓中学2020-2021学年高一(实验班)下学期第一次月考数学(文)试题