1 . 17世纪法国数学家费马在给朋友的一封信中曾提出一个关于三角形的有趣问题:在三角形所在平面内,求一点,使它到三角形每个顶点的距离之和最小.现已证明:在
中,若三个内角均小于120°,则当点
满足
时,点
到
三个顶点的距离之和最小,点
被人们称为费马点.根据以上知识,已知在
中,
,
,
,
为
内一点,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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2 . 若
内一点
满足
,则称点
为
的布洛卡点,
为
的布洛卡角.如图,已知
中,
,
,
,点
为的布洛卡点,
为
的布洛卡角.
,且满足
,求
的大小.
(2)若
为锐角三角形.
(ⅰ)证明:
.
(ⅱ)若
平分
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f272ca460306b34bf7e3e99d38dca8b.png)
(ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
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6卷引用:河北省部分高中2024届高三下学期二模考试数学试题
河北省部分高中2024届高三下学期二模考试数学试题(已下线)2024年普通高等学校招生全国统一考试数学押题卷(一)(已下线)压轴题07三角函数与正余弦定理压轴题9题型汇总-1湖南省长沙市长郡中学2024届高考适应考试(三)数学试题(已下线)专题02 第六章 解三角形及其应用-期末考点大串讲(人教A版2019必修第二册)(已下线)专题06 解三角形综合大题归类(2) -期末考点大串讲(苏教版(2019))
3 . 由椭圆的两个焦点和短轴的一个顶点组成的三角形称为该椭圆的“特征三角形”.如果椭圆
的“特征三角形”为
,椭圆
的“特征三角形”为
,若
,则称椭圆
与
“相似”,并将
与
的相似比称为椭圆
与
的相似比.已知椭圆
:
与椭圆
:
相似.
(1)求椭圆
的离心率;
(2)若椭圆
与椭圆
的相似比为
,设
为
上异于其左、右顶点
,
的一点.
①当
时,过
分别作椭圆
的两条切线
,
,切点分别为
,
,设直线
,
的斜率为
,
,证明:
为定值;
②当
时,若直线
与
交于
,
两点,直线
与
交于
,
两点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5518f853e3a929edf3dd3cee8ec0760d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5518f853e3a929edf3dd3cee8ec0760d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8321b4034b3ab70b6cbfa25bca18df2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5532211b42702f7b281834d500c666d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249767ae3bf665f1c8db866dbb366940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e260f5fe6e3637a415344ff137c7a6be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f685277f6c178fb1fcd5e8387886721.png)
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3卷引用:河北省石家庄市七县联考2023-2024学年高二下学期3月月考数学试题
解题方法
4 . 数学家Geminad Dandelin用一平面截圆锥后,在圆锥内放两个大小不同的小球,使得它们分别与圆锥侧面、截面相切,就可证明图中平面截圆锥得到的截面是椭圆(如图称为丹德林双球模型).若圆锥的轴截面为正三角形,则用与圆锥的轴成
角的平面截圆锥所得椭圆的离心率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
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5 . 固定项链的两端,在重力的作用下项链所形成的曲线是悬链线.1691年,莱布尼茨等得出“悬链线”方程为
,其中
为参数.当
时,就是双曲余弦函数
,类似地我们可以定义双曲正弦函数
.它们与正、余弦函数有许多类似的性质.
(1)类比正、余弦函数导数之间的关系,
,
,请写出
,
具有的类似的性质(不需要证明);
(2)当
时,
恒成立,求实数
的取值范围;
(3)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36c70866e186865bea633e5523f6cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed02acb0c7b4e40c26f6760627a033e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbcc2e6bbcbd9344009a0b032a42fbeb.png)
(1)类比正、余弦函数导数之间的关系,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4433c2142e8c48f7f28a1d355c1b8423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0c08352291e1f947adb05b4ebb0b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c540f798ab69463cf35af2772a3a19cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1ee2c2965ab4a51d26062fb0e665a5.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1171398bec485dd63bbf678e541c87d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38aeee08c615db7a216518bf5e76dc7f.png)
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16卷引用:河北省正定中学2023-2024学年高二下学期第一次月考数学试题
河北省正定中学2023-2024学年高二下学期第一次月考数学试题河北省邯郸市大名县第一中学2023-2024学年高二下学期3月月考数学试卷广西示范性高中2023-2024学年高二下学期3月调研测试数学试卷(已下线)模块一 专题3 导数在研究函数极值和最值中的应用(B)(已下线)综合检测卷(数列+导数)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第二册)湖北省荆州市沙市中学2023-2024学年高二下学期3月月考数学试题广东省揭阳市惠来县第一中学2023-2024学年高二下学期3月月考数学试题(已下线)模块四 专题1 高考新题型专练(新定义专练)(人教A)(高二)(已下线)高二下学期第一次月考模拟卷(新题型)(导数+计数原理)-2023-2024学年高二数学题型分类归纳讲与练(人教A版2019)山东省临沂市第二十四中学2023-2024学年高二下学期3月月考数学试题吉林省长春外国语学校2023-2024学年高二下学期4月月考数学试卷(已下线)模块一 专题3 《导数在研究函数极值和最值中的应用》B提升卷(苏教版)(已下线)模块三 专题3 高考新题型专练 专题2 新定义专练(苏教版)广东省深圳市高级中学(集团)2023-2024学年高二下学期期中考试数学试卷(已下线)上海市四校(复兴高级中学、松江二中、奉贤中学、金山中学)2024届高三下学期3月联考数学试题变式题17-21福建省龙岩市连城县第一中学2023-2024学年高二下学期5月月考(2)数学试题
2024·全国·模拟预测
名校
6 . 美国数学史家、穆伦堡学院名誉数学教授威廉・邓纳姆在1994年出版的The Mathematical Universe一书中写道:“相比之下,数学家达到的终极优雅是所谓的‘无言的证明’,在这样的证明中一个极好的令人信服的图示就传达了证明,甚至不需要任何解释.很难比它更优雅了.”如图所示正是数学家所达到的“终极优雅”,该图(
为矩形)完美地展示并证明了正弦和余弦的二倍角公式,则可推导出的正确选项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 牛顿在《流数法》一书中,给出了代数方程的一种数值解法——牛顿法.具体做法如下:如图,设r是
的根,首先选取
作为r的初始近似值,若
在点
处的切线与
轴相交于点
,称
是r的一次近似值;用
替代
重复上面的过程,得到
,称
是r的二次近似值;一直重复,可得到一列数:
.在一定精确度下,用四舍五入法取值,当
近似值相等时,该值即作为函数
的一个零点
.
,当
时,求方程
的二次近似值(保留到小数点后两位);
(2)牛顿法中蕴含了“以直代曲”的数学思想,直线常常取为曲线的切线或割线,求函数
在点
处的切线,并证明:
;
(3)若
,若关于
的方程
的两个根分别为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3047d4ab078dafc06c047bcbf0a6ffaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/845b4f3a8f4aae8a8f97328dec21552a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29fecaa6b3e14aaf1a20ccf2b39bbe7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b99bab533c13bb8e4d09bbc646bbb5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786213763946db2cb6974f9fabad6540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909736dad505d81be43aef91e6309bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3047d4ab078dafc06c047bcbf0a6ffaf.png)
(2)牛顿法中蕴含了“以直代曲”的数学思想,直线常常取为曲线的切线或割线,求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfce215a0f2e0c00249cda12ac2b065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25b336a6ae4116b88076e9a9a723332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c417b0bdd2f26b54c74c52cb763572.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11821d923a6bec96212e1cedde4244ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93a9dc63ab7eb56073cdb154e414941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dae74c724114bfeff024dd7b79f5edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fd88f71f4c51c9a8249d8434258729.png)
您最近一年使用:0次
2024-04-24更新
|
767次组卷
|
3卷引用:河北省衡水市第二中学2023-2024学年高二下学期5月学科素养检测(二调)数学试题
名校
解题方法
8 . 2023年9月23日,杭州第19届运动会开幕式现场,在AP技术加持下,寄托着古今美好心愿的灯笼升腾而起,溢满整个大莲花场馆,融汇为点点星河流向远方,绘就了一幅万家灯火的美好图景.灯笼又统称为灯彩,是一种古老的汉族传统工艺品,经过数千做年的发展,灯笼也发展出了不同的地域风格,形状也是千姿百态,每一种灯笼都具有独特的艺术表现形式.现将一个圆柱形的灯笼切开,如图所示,用平面
表示圆柱的轴截面,
是圆柱底面的直径,
为底面圆心,E为母线
的中点,已知
为一条母线,且
.
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07956720a50ff238c0766a5d58d00e2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/692fb834-f608-4bcb-b60c-81594072c4ed.png?resizew=274)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d66cdf7f987bb08a83b732a071ac2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc28d80236679dacffd255cf64f1384.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b79907c2cf53627967657303fc14fe8.png)
您最近一年使用:0次
2023-11-09更新
|
928次组卷
|
6卷引用:河北省保定市定州市2023-2024学年高二上学期期中数学试题
河北省保定市定州市2023-2024学年高二上学期期中数学试题河北省石家庄一中2023-2024学年高二上学期期中数学试题河南省信阳市信高教育集团南湾校区2023-2024学年高二上学期期末复习检测数学试题(一)河南省驻马店高级中学2023-2024学年高二上学期第三次月考数学试题(已下线)压轴题立体几何新定义题(九省联考第19题模式)讲(已下线)第六章 突破立体几何创新问题 专题二 融合科技、社会热点 微点2 融合科技、社会热点等现代文化的立体几何和问题(二)【培优版】
名校
解题方法
9 . 三等分角是古希腊几何尺规作图的三大问题之一,如今数学上已经证明三等分任意角是尺规作图不可能问题,如果不局限于尺规,三等分任意角是可能的.下面是数学家帕普斯给出的一种三等分角的方法:已知角
的顶点为
,在
的两边上截取
,连接
,在线段
上取一点
,使得
,记
的中点为
,以
为中心,
为顶点作离心率为2的双曲线
,以
为圆心,
为半径作圆,与双曲线
左支交于点
(射线
在
内部),则
.在上述作法中,以
为原点,直线
为
轴建立如图所示的平面直角坐标系,若
,点
在
轴的上方.
的方程;
(2)若过点
且与
轴垂直的直线交
轴于点
,点
到直线
的距离为
.
证明:①
为定值;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a998a7d4d980e848ee050b706480ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e587c886cd9f7d48f0cce82dcb940c8f.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75eb52879657138c23304b1634c73f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d566a90ab70e7133f0f110143a4f06ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881b1640911274127b9aa3d647ee903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
证明:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422fd5f0bdef76f7f05c6f803dddc982.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d566a90ab70e7133f0f110143a4f06ae.png)
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10 . 如图反映了二项式定理产生、完备和推广所走过的漫长历程:
推广到
,请你算一算
的系数______ ,
的系数______ .(用组合数表示即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5693ff4ce1cbf7266fdaf3fac9b4826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272710318d9dbdf374b813337eb9c1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cef3cf3774a0f4e42ecc394e77900de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d34b22cec7eca587507a8eb3c73437.png)
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