解题方法
1 . 在正四棱锥
中,
分别是
的中点,过直线
的平面
分别与侧棱
交于点
.
![](https://img.xkw.com/dksih/QBM/2023/11/22/3373398996164608/3388586840621056/STEM/89f802a55ba745cc8e40ab79726780ee.png?resizew=192)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930e85bc9f73e86cfb6ce9b076433f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://img.xkw.com/dksih/QBM/2023/11/22/3373398996164608/3388586840621056/STEM/89f802a55ba745cc8e40ab79726780ee.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9948a4eeae82dd50df79cf3c746adf31.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828247a3338571cb0d4ba2a5bf88929c.png)
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解题方法
2 . 已知数列
的前n项和为
(
),等差数列
中,
(
),且
,又
成等比数列.
(1)求数列
,
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f09f3cc1f87b55c1bb6a920c8221b29b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0dd3fb6af23def773e1b0032a4f3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099585c6dd7df5ad7b75cfcb68db7676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8491922ccb3c5882bdd6d467a9880ec.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c394d7bd6be49f089aa78d2d4fd0a9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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3 . 已知
中,
,
,
,解此三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d08b57154095b7094748c6f7962741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa6633438cc8c38e7843d5b5018f66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681d4bd61655db4571359615e2626fbf.png)
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4 . 从甲乙两个班的男生中各随机抽取10名同学, 测量他们的身高(单位:cm),获得身高数据的茎叶图如图所示.求样本中:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/cde36abf-35c6-418d-bd52-c27f25b681a6.png?resizew=161)
(1)甲班的中位数和乙班的众数以及甲、乙两个班的平均身高;
(2)甲班的样本方差.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/cde36abf-35c6-418d-bd52-c27f25b681a6.png?resizew=161)
(1)甲班的中位数和乙班的众数以及甲、乙两个班的平均身高;
(2)甲班的样本方差.
您最近一年使用:0次
解题方法
5 . 如图所示的是求数列{an}的第n项an的程序框图.
(1)根据程序框图写出数列{an}的递推公式;
(2)证明数列{ an }为等比数列,并求出数列{an}的通项公式;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/d630b34e-5544-45a1-a783-c980d6106a29.png?resizew=75)
(1)根据程序框图写出数列{an}的递推公式;
(2)证明数列{ an }为等比数列,并求出数列{an}的通项公式;
您最近一年使用:0次
6 . 如图,正方体
的棱长为1,在正方体内随机取一点M.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/0c421ce4-90e9-4ce0-9a39-8c147fa9ed5f.png?resizew=178)
(1)使四棱锥
的体积小于
的概率;
(2)落在以正方体的中心为球心,半径为
的球的内部的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/0c421ce4-90e9-4ce0-9a39-8c147fa9ed5f.png?resizew=178)
(1)使四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(2)落在以正方体的中心为球心,半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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7 . 如图,直线
,
,
,
为线段
上一点,且
,点
、
分别为直线
、
上的点,且
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/3434e414-12b8-4e66-b95d-5e9d1b008dac.png?resizew=154)
(1)当
,求
的面积
;
(2)用
表示
的面积
,并求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e03566282ef39ad17821036f228174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd2d246f0850db73fe2e6b1e26eb549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.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/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548edcb48a64ab7570e9195a39bed656.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/3434e414-12b8-4e66-b95d-5e9d1b008dac.png?resizew=154)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de0022a7f2e122492f1483e4d3cccba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e9e650e76d84f709d26f7b7274dadc.png)
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de0022a7f2e122492f1483e4d3cccba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd7229922fbb3ce09dada883f74fbb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd7229922fbb3ce09dada883f74fbb1.png)
您最近一年使用:0次
名校
解题方法
8 . 向量
,
如图所示,求:
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8448ca50a6033820349871e724f4be.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff1118e824c1429a4e7c76bf3abce52.png)
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2023-12-04更新
|
429次组卷
|
5卷引用:2023年7月辽宁省普通高中学业水平合格性考试数学试卷
2023年7月辽宁省普通高中学业水平合格性考试数学试卷 (已下线)第六章 平面向量及其应用(单元综合测试卷)-【寒假自学课】(人教A版2019)河南省郑州市中牟县第一高级中学2023-2024学年高一下学期3月月考数学试题(已下线)模块五 专题1 全真基础模拟1 (人教B高一期中研习室)(已下线)模块五 专题1 全真基础模拟1(苏教版期中研习高一)
名校
解题方法
9 . 某项选拔共有三轮考核,每轮设有一个问题,能正确回答问题者进入下一轮考核,否则即被淘汰.已知某选手能正确回答第一、二、三轮的问题的概率分别为
,
,
,且各轮问题能否回答正确互不影响.求:
(1)该选手进入第三轮考核才被淘汰的概率;
(2)该选手至多进入第二轮考核的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(1)该选手进入第三轮考核才被淘汰的概率;
(2)该选手至多进入第二轮考核的概率.
您最近一年使用:0次
2023-12-04更新
|
1185次组卷
|
6卷引用:2023年7月辽宁省普通高中学业水平合格性考试数学试卷
2023年7月辽宁省普通高中学业水平合格性考试数学试卷 山东省潍坊市临朐县第一中学2023-2024学年高二上学期期末模拟数学试题(已下线)4.1.3 独立性检验与条件概率的关系(分层练习)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第二册)辽宁省抚顺市六校协作体2023-2024学年高一上学期期末数学试题(已下线)第15章 概率章末题型归纳总结-【帮课堂】(苏教版2019必修第二册)(已下线)15.3 互斥事件和独立事件(1)-【帮课堂】(苏教版2019必修第二册)
解题方法
10 . 《九章算术》作为中国古代数学专著之一,在其“商功”篇内记载:“斜解立方,得两堑堵.斜解堑堵,其一为阳马,一为鳖臑.”鳖臑是我国古代数学对四个面均为直角三角形的四面体的统称.如图所示,
是长方体.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6a84f643-7a0a-48be-a06e-2c4d86274256.png?resizew=133)
(1)求证:三棱锥
为鳖臑;
(2)若
,
,
,求三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6a84f643-7a0a-48be-a06e-2c4d86274256.png?resizew=133)
(1)求证:三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
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