解题方法
1 . 如图所示,在四边形
中,
,
,
,
,
,点
为四边形
的外接圆劣弧
(不含端点
,
)上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/77dc3669-b556-4f5a-bfd4-5d7e44723f9e.png?resizew=142)
(Ⅰ)判断
的形状,并证明;
(Ⅱ)若
,设
,
,求函数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954d2fd2aecd31ff67d975bc8981023a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f028b10ae7e2a83316c077cdccd6ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2f5f6d9efe3852a2329ea927abcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/77dc3669-b556-4f5a-bfd4-5d7e44723f9e.png?resizew=142)
(Ⅰ)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272c5e2a28daff5a36abd64267fcaa5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a9ab5a9114daaa0fd3f6c5f1885f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038bd8c95ff3649e957b67036207fbe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794f2c6bd63355105d179d11306a9cae.png)
您最近一年使用:0次
20-21高一·浙江·期末
名校
2 . 如图,在矩形
中,
,E为
的中点,把△
和△
分别沿
折起,使点B与点C重合于点P.
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd4fb83908d0cabf3cc17ea6ce4a3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e88d8672e8521e27058252f51000281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a571a8a9e4b838f8e9297bbba7f9d121.png)
您最近一年使用:0次
2021-03-18更新
|
1747次组卷
|
3卷引用:【新东方】绍兴高中数学00032
(已下线)【新东方】绍兴高中数学00032江西省南昌市八一中学、洪都中学等七校2020-2021学年高二下学期期中联考数学(理)试题安徽省马鞍山市第二中学2023-2024学年高二上学期开学检测数学试题
解题方法
3 . 在锐角
中,角
、
、
所对的边分别为
、
、
,已知
.
(Ⅰ)求证
;
(Ⅱ)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/83d2d1a1b5b455f2c224f18fd40673bd.png)
(Ⅰ)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f47bdd9c279a32b499ad31a124768edf.png)
您最近一年使用:0次
名校
4 . 已知
,
,
.
(1)记函数
,求函数
取最大值时
的取值范围;
(2)求证:
与
不平行;
(3)设
的三边
、
、
满足
,且边
所对应的角为
,关于
的方程
有且仅有一个实根,求实数
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cbfc36c535fd54311d7e7be39a82be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd351d64a36474ff8f3f1eb64ac5d519.png)
(1)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c25f1d401fe5fd8748bb7c89751493b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1df960feef63dec4790d63f52279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82a12f606ee2ee9ee7eff1f805852ac.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/988b7e964e313579ab8869d67d5be007.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d28b3145d1fd20a4ab20d9a90fb9c511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2021-07-19更新
|
449次组卷
|
4卷引用:上海市建平中学2020-2021学年高一下学期期末数学试题
上海市建平中学2020-2021学年高一下学期期末数学试题上海市川沙中学2021-2022学年高一下学期期末数学试题(已下线)上海市高一下学期期末真题必刷04-期末考点大串讲(沪教版2020必修二)上海市川沙中学2022-2023学年高二上学期开学考试数学试题
解题方法
5 . 如图,平面凹四边形ABCD,其中AB=3,BC=5,∠ABC=120°,ADsinA=CDsinC.
![](https://img.xkw.com/dksih/QBM/2021/10/21/2834055182721024/2838913362141184/STEM/bda84b8a33a14558bbb06ca465680a33.png?resizew=283)
(1)证明:BD为∠ABC的角平分线.
(2)若BD=1,求∠ADC的值.
![](https://img.xkw.com/dksih/QBM/2021/10/21/2834055182721024/2838913362141184/STEM/bda84b8a33a14558bbb06ca465680a33.png?resizew=283)
(1)证明:BD为∠ABC的角平分线.
(2)若BD=1,求∠ADC的值.
您最近一年使用:0次
20-21高一·全国·课后作业
解题方法
6 . 已知
为坐标原点,
,
,
.
(1)求点
在第二或第三象限的充要条件;
(2)求证:当
时,不论
为何实数,
、
、
三点都共线;
(3)若
,求当
且△
的面积为12时,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40630a669f4eedf626bc24851df10c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6edbe193d0f415569a43c3a42a6d41d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78321c832af99bd9b75853268afe48ee.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7506cd409fc15693d2fa0f69fcc0464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd84a8f95166367063218ee03ffd5a7.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/ac047e91852b91af639feec23a9598b2.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e37a63ee29fda9396419f2eb9a6a6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a694b7f59f6e072144129274d442f843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
7 . 古希腊数学家普洛克拉斯曾说:“哪里有数学,哪里就有美,哪里就有发现……”,对称美是数学美的一个重要组成部分,比如圆,正多边形……,请解决以下问题:
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709589299273728/2759660379553792/STEM/1eef0c92360245aa8e4c2533a2eebb6e.png?resizew=191)
(1)魏晋时期,我国古代数学家刘徽在《九章算术注》中提出了割圆术:“割之弥细,所失弥少,割之又割,以至于不可割,则与圆合体,而无所失矣”,割圆术可以视为将一个圆内接正n边形等分成n个等腰三角形(如图所示),当n变得很大时,等腰三角形的面积之和近似等于圆的面积,运用割圆术的思想,求
的近似值(结果保留
).
(2)正n边形的边长为a,内切圆的半径为r,外接圆的半径为R,求证:
.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709589299273728/2759660379553792/STEM/1eef0c92360245aa8e4c2533a2eebb6e.png?resizew=191)
(1)魏晋时期,我国古代数学家刘徽在《九章算术注》中提出了割圆术:“割之弥细,所失弥少,割之又割,以至于不可割,则与圆合体,而无所失矣”,割圆术可以视为将一个圆内接正n边形等分成n个等腰三角形(如图所示),当n变得很大时,等腰三角形的面积之和近似等于圆的面积,运用割圆术的思想,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/440ce692fa6eef853b95f4c9ddba9294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
(2)正n边形的边长为a,内切圆的半径为r,外接圆的半径为R,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41b98a3d788ea1255c209653fb728d3.png)
您最近一年使用:0次
2021-07-08更新
|
563次组卷
|
4卷引用:江苏省镇江中学2020-2021学年高一下学期期中数学试题
江苏省镇江中学2020-2021学年高一下学期期中数学试题(已下线)数学与文学贵州省黔西南州金成实验学校2021-2022学年高一下学期4月质量监测数学试题(已下线)压轴题三角函数新定义题(九省联考第19题模式)练
解题方法
8 . 欧几里得在《几何原本》中,以基本定义、公设和公理作为全书推理的出发点.其中第
命题
是著名的毕达哥拉斯定理(勾股定理),书中给出了一种证明思路:如图,
中,
,四边形
、
、
都是正方形,
于点
,交
于点
.先证明
与
全等,继而得到矩形
与正方形
面积相等;同理可得到矩形
与正方形
面积相等;进一步定理得证.在该图中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5daba050b7d206828eb9f8708c55c2d0.png)
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/d7f19d06-3b34-4279-9ba7-e29a08e94377.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26054bdb136bc2e874a6a6cb2b8e34b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63471494ced978d1fc9099de448c03ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281b641656a5992abaafb4190ca9afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d13f001c04c8af4ae17d22f61e495a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a639f1cd639c846012df4a07caf131c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf194e8909403c0adf2f95f60e7f4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa485cf3776f36aaf4abaadaf30fb85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91aff7b6e37f06ab1eea4d2b8d0adb3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85269f86a8fec5fcc5a26ef300f02cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a639f1cd639c846012df4a07caf131c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eadc3e1c22683c687ce0c24893b22f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecf70408ab8154ad1b1f88bca72aa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5daba050b7d206828eb9f8708c55c2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3288da1bb551b3293db9b7ebebdbe64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/d7f19d06-3b34-4279-9ba7-e29a08e94377.png?resizew=183)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
9 . 已知等边三角形
分别是边
上的三等分点,且
(如图甲),将
沿
折起到
的位置(如图乙),
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/fee79488-59ec-4eb1-9cf0-973366d5735d.png?resizew=399)
(1)求证:
平面
;
(2)若二面角
的大小为
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ab05980824d7403b26cc3d3aa5436f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/fee79488-59ec-4eb1-9cf0-973366d5735d.png?resizew=399)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/628d6fc46c651e0c783b81a123a7b229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a98287a302228ece1fa53c5c66c590f.png)
您最近一年使用:0次
名校
10 . 在非直角三角形
中,角
的对边分别为
.
(1)若
,且
,判断三角形
的形状;
(2)若
,
(i)证明:
;(可能运用的公式有
)
(ii)是否存在函数
,使得对于一切满足条件的m,代数式
恒为定值?若存在,请给出一个满足条件的
,并证明之;若不存在,请给出一个理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02746ec8e4220d8b4a174d5e9a711ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1dd07c0571772e96d318f974724810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa949e59d152bdb7d77cd19ac79051f.png)
(i)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18c985cbe661f18eef831dcbc56f9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889623d5e61054f38a35aedd644c9ff5.png)
(ii)是否存在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb4068ea539526f142b8d26dbb622be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4977f0df9fe38d488b5926b9d8c23c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb4068ea539526f142b8d26dbb622be.png)
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