解题方法
1 . 在
中,角
,
,
所对的边分别是
,
,
,且
.
(1)求证:三内角
,
,
成等差数列;
(2)若
的面积为
,
,求
的周长.
![](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/f5cebb82cc09cb0ab0c50a268edb9bee.png)
(1)求证:三内角
![](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)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78de7dac9af2a4bd28ae06e5c67239e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2021·全国·模拟预测
解题方法
2 . 已知
的内角
,
,
所对的边分别为
,
,
.
(1)若
,且
,求证:
;
(2)若
,且
,求
的面积.
![](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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cb21ae875f36d52d0b6f82b0201d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82685fe8db46d79ed3efa7219558023.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8abff30fc308565d3a23dd2739e5c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faca188c07dd90897368a3942a9dbb63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
3 . 定义:一个几何体的表面积与体积之比称为几何体的相对表面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6ba80a31-b0df-4143-9297-5b18fd989aaf.png?resizew=95)
(1)若一个直三棱柱高为
,底面三角形的内切圆半径为
,相对表面积为
,求证:
;
(2)如图,一块直三棱柱形状的蛋糕,底面三边长分别为3,4,5,若蛋糕的最外层包裹着薄薄的一层巧克力(厚度忽略不计),用刀垂直于底面将蛋糕切开,使之成为两块直棱柱状的小蛋糕,要求两块小蛋糕的相对表面积相等,且包裹的巧克力面积相等,有几种切法.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6ba80a31-b0df-4143-9297-5b18fd989aaf.png?resizew=95)
(1)若一个直三棱柱高为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f562eb3c2a45d65cba066d712825a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25959080a5c3732c7af0edf5699a97c.png)
(2)如图,一块直三棱柱形状的蛋糕,底面三边长分别为3,4,5,若蛋糕的最外层包裹着薄薄的一层巧克力(厚度忽略不计),用刀垂直于底面将蛋糕切开,使之成为两块直棱柱状的小蛋糕,要求两块小蛋糕的相对表面积相等,且包裹的巧克力面积相等,有几种切法.
您最近一年使用:0次
4 . 在
中,
为
上一点,
,
,
是线段
的延长线上一点.
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723899226841088/2724413605085184/STEM/7696541469f74d3dbc7d20ad4df897dd.png?resizew=201)
(1)证明:
;
(2)若
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d6cf7cc588b3ccddd199d31466c3ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c79851135cf756fc590159a189e330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723899226841088/2724413605085184/STEM/7696541469f74d3dbc7d20ad4df897dd.png?resizew=201)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ce1139b4f8d9fd5f98e3e0d2e73fa2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4297c0901be268faf59fb5622f19f310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6752845c4d82ff33dfb954cbd50ded2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
您最近一年使用:0次
2021·全国·模拟预测
5 . 如图,在
中,
为
上一点,
,
是线段
的延长线上一点,
.
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723895365468160/2723929852010496/STEM/26649c25-2ff8-4f56-b889-b505dd870b86.png?resizew=287)
(1)证明:
;
(2)已知
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d6cf7cc588b3ccddd199d31466c3ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c79851135cf756fc590159a189e330.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723895365468160/2723929852010496/STEM/26649c25-2ff8-4f56-b889-b505dd870b86.png?resizew=287)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ce1139b4f8d9fd5f98e3e0d2e73fa2.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4297c0901be268faf59fb5622f19f310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8431e94821612587f5bda0e4b7b4e4a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
您最近一年使用:0次
解题方法
6 . 在
中,
,且
,
,
均为整数.
(1) 求
的大小;
(2) 设
的中点为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08bf0a121ade364913ff0d231f0315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03005d17bf564371ad29fea41f5c650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e29b775e696045f44a4b1e7f74ef2.png)
(1) 求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2) 设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
您最近一年使用:0次
2021-07-03更新
|
634次组卷
|
3卷引用:2021年全国高考临门一卷 湖南数学(二)
名校
解题方法
7 . 四棱锥
中,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/3ee80563-15d8-424a-91fd-fee8f3ad9131.png?resizew=144)
(1)求证:
;
(2)
为
中点,求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62526e69e7c4e59d9df8a5b2c2426400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/3ee80563-15d8-424a-91fd-fee8f3ad9131.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d50a68fed1c23837d1267bdda5c1962.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
您最近一年使用:0次
2021-05-16更新
|
1055次组卷
|
4卷引用:黑龙江省哈尔滨师范大学附属中学2021届高三第三次模拟文科数学试题
解题方法
8 . 已知
的内角
、
、
所对的边分别为
、
、
,且
.
(1)判断
的形状并证明;
(2)若
,
的面积
,求
的内切圆半径
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.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/5b74f6929393d07a9399ae179479bf71.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15aa03a938c7d11e862ddd0579077c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3dcbb853e4b9fd1d011bd5f1948018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
您最近一年使用:0次
名校
解题方法
9 . 阿波罗尼斯(古希腊数学家,约公元前262-190年)的著作《圆锥曲线论》是古代世界光辉的科学成果,它将圆锥曲线的性质网罗殆尽几乎使后人没有插足的余地.他证明过这样一个命题:平面内与两定点距离的比为常数k(
且
)的点的轨迹是圆,后人将这个圆称为阿氏圆现有
,
,
,则当
的面积最大时,它的内切圆的半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49aec36cc1cf42c48acaa31f3c8fcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2020-08-06更新
|
1348次组卷
|
10卷引用:湖南省长沙市长郡中学2020届高三下学期高考模拟(一)文科数学试题
湖南省长沙市长郡中学2020届高三下学期高考模拟(一)文科数学试题湘豫名校2020届高三联考(6月)数学(文科)试题(已下线)2.1+曲线与方程(2)(重点练)-2020-2021学年高二数学(理)十分钟同步课堂专练(人教A版选修2-1)江苏省镇江中学2020-2021学年高二上学期期初数学试题江苏省南京市2020-2021学年高二上学期期中模拟数学试题(已下线)第九单元 解析几何 (A卷 基础过关检测)-2021年高考数学(文)一轮复习单元滚动双测卷四川省成都市金牛区第十八中学校2020-2021学年高二上学期10月月考数学理试题(已下线)专题12 正余弦定理妙解三角形问题和最值问题(练习)湖北省十堰市城区普高协作体2020-2021学年高二上学期期中数学试题安徽省马鞍山市第二中学2020-2021学年高二上学期12月月考理科数学试题
名校
解题方法
10 . 已知
的内角
,
,
的对边分别为
,
,
,且满足
.
(1)证明:
;
(2)已知
,
的面积为
,求
.
![](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/98108c4534ed8e52f945edb07e6cbeef.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2c413253fe5bc1f9287a35e6fc45eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c4b4e4f7dd55be05b78b49b08ae4c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
2020-07-31更新
|
419次组卷
|
2卷引用:山东省2020年普通高等学校招生统一考试数学必刷卷(五)