解题方法
1 . 在
中,
与
的角平分线交于点D,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/23/1eb627a2-0e69-4184-aa6b-9f1210ccd541.png?resizew=152)
(1)求角B的大小;
(2)若
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0621ef38677882a64752aff9ac4d1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/23/1eb627a2-0e69-4184-aa6b-9f1210ccd541.png?resizew=152)
(1)求角B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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3卷引用:吉林省名校联盟2023-2024学年高一下学期期中联合质量检测数学试题
吉林省名校联盟2023-2024学年高一下学期期中联合质量检测数学试题内蒙古自治区兴安盟2023-2024学年高二下学期学业水平质量检测数学试题(已下线)第9题 解三角形在几何图形中的应用(高一期末每日一题)
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解题方法
2 . 古希腊数学家托勒密对凸四边形(凸四边形是指没有角度大于180°的四边形)进行研究,终于有重大发现:任意一凸四边形,两组对边的乘积之和不小于两条对角线的乘积,当且仅当四点共圆时等号成立.且若给定凸四边形的四条边长,四点共圆时四边形的面积最大.根据上述材料 ,解决以下问题,如图,在凸四边形
中,
,
,
,
(图1),求线段
长度的最大值;
(2)若
,
,
(图2),求四边形
面积取得最大值时角
的大小,并求出四边形
面积的最大值;
(3)在满足(2)条件下,若点
是
外接圆上异于
的点,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422f54faa21cdabc65b912b0e76eb68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c41757ae282475fb29ec1e8e02045d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)在满足(2)条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b94fd6403a7f18702993f80e29bfe1.png)
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3卷引用:辽宁省协作校2023-2024学年高一下学期5月期中考试数学试题
辽宁省协作校2023-2024学年高一下学期5月期中考试数学试题安徽省阜阳市第三中学2023-2024学年高一下学期第二次调研(期中)数学试题(已下线)第9题 解三角形在几何图形中的应用(高一期末每日一题)
3 . 已知正项数列
中,
,且
.
(1)求数列
的通项公式;
(2)
,证明,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed0367987c04be8561bcecd097dd981.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64550bd5d557facd691696e60b27510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79ee9bb88c0d1b069a7924162a84ab8.png)
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4 . 下列命题为真命题的是( )
A.若![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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解题方法
5 . 如图,在平面四边形ABCD中,
,
.
,
,求
的值;
(2)若
,
,求三角形ABD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5441d73845911db1993bf903c4d8700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819c7a62f0c3f64f53370d19db912c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/395c8d0c2d490ffd4d6aadfb3517f9ec.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ccf71566dd0f3c2215c28f55925986.png)
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6 . 定义:在一个有穷数列的每相邻两项之间插入这两项的和,形成新的数列,我们把这样的操作称为该数列的一次“和扩充”,例如:数列
经过第一次“和扩充”后得到数列
;第二次“和扩充”后得到数列
.设数列
经过
次“和扩充”后得到的数列的项数为
,所有项的和为
.
(1)若
,求
;
(2)求不等式
的解集;
(3)是否存在数列
,使得数列
为等比数列?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680e9ef551b325387ab31dca1f893705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2d5ffc86bda25b7fd377267ae3e7df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1d5a07307b7d2603995105ab2490f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33d09c34e89bc99fbeb30bac80d4f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a642ed9870f81d906816bc0db3d621c.png)
(2)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcd08431daac10be93e6fafbc5d4a90.png)
(3)是否存在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863d3bc9596595b16499a46479526680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
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解题方法
7 . 已知
,若
成立,则实数
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3dca67c094911c3bbb74fac10ddc5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.2 | B.3 | C.4 | D.5 |
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8 . 如图所示的一系列正方形图案称为“谢尔宾斯基地毯”,在4个大正方形中,着色的小正方形的个数依次构成一个数列
的前4项. 记
,则下列结论正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06e6bb6f926309960fb94b0650ce6e0.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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2卷引用:四川省南充高中2023-2024学年高三下学期第十三次月考理科数学试卷(附答案)
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9 . 在
中,角
的对边为
若
,则
的面积可以是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7132c2d8b2ff504e6c2ba36c4f6dcfaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8303f198d710fa04bad0b663a0ef0630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.3 | C.![]() | D.![]() |
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10 . 设为
等差数列
的前n项和,已知
、
、
成等比数列,
,当
取得最大值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d85252ec30a427151f300503e3024d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2297a9ddfd3d681025c3dc5a93d6751f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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