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解题方法
1 . 如图某机器零件结构模型,中间最大球为正四面体
的内切球,中等球与最大球和正四面体三个面均相切,最小球与中等球和正四面体三个面均相切,已知正四面体
棱长为
,则模型中九个球的体积和为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e8abf8690e4b129466ddb918bcc94.png)
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2 . 已知球
与正方体
的各个面相切,平面
截球
所得的截面的面积为
,则正方体棱长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8d7771b82429dcd6b48b768918c7c3.png)
A.![]() | B.![]() | C.1 | D.2 |
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2卷引用:河南省部分学校2023-2024学年高一下学期6月联考数学试题
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3 . 若非空实数集X中存在最大元素M和最小元素m,则记
.下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63cf0f3392d77db21347ed4e94812a6.png)
A.已知![]() ![]() ![]() |
B.已知![]() ![]() ![]() ![]() |
C.已知![]() ![]() |
D.已知![]() ![]() |
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3卷引用:上海市复旦大学附属中学2022届高三上学期9月月考数学试题
解题方法
4 . 对任意两个非零向量
,定义
.若非零向量
,满足
,向量
与
的夹角是锐角,且
是整数,则
的取值范围是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662917aedec92809a13618093c8e0c3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c7ac4b4b9924ef29792fa6ac198f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26739971f3cae6d4790870c344b5cf89.png)
![](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/b35bee611ba4204db25848d5925c618d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db35dbee504e3e66bfd03c24e4b7322.png)
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5 . 若函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2108d97caa96b493e77c070b60703ea.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.函数![]() ![]() |
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6 . 某学校有甲、乙、丙三家餐厅,分布在生活区的南北两个区域,其中甲、乙餐厅在南区,丙餐厅在北区各餐厅菜品丰富多样,可以满足学生的不同口味和需求.
附:
;
(1)现在对学生性别与在南北两个区域就餐的相关性进行分析,得到下表所示的抽样数据,依据
的独立性检验,能否认为在不同区域就餐与学生性别有关联?
(2)张同学选择餐厅就餐时,如果前一天在甲餐厅,那么后一天去甲,乙餐厅的概率均为
;如果前一天在乙餐厅,那么后一天去甲,丙餐厅的概率分别为
:如果前一天在丙餐厅,那么后一天去甲,乙餐厅的概率均为
.张同学第1天就餐时选择甲,乙,丙餐厅的概率分别为
.
(i)求第2天他去乙餐厅用餐的概率;
(ii)求第
天他去甲餐厅用餐的概率
.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a75f2f332c9e20717bd0c2d43173fa.png)
![]() | 0.100 | 0.050 | 0.025 | 0.010 |
![]() | 2.706 | 3.841 | 5.024 | 6.635 |
(1)现在对学生性别与在南北两个区域就餐的相关性进行分析,得到下表所示的抽样数据,依据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31cbe1ab3e6cd7281b2ea886dd0cd9b.png)
性别 | 就餐区域 | ||
南区 | 北区 | ||
男 | 33 | 10 | 43 |
女 | 38 | 7 | 45 |
合计 | 71 | 17 | 88 |
(2)张同学选择餐厅就餐时,如果前一天在甲餐厅,那么后一天去甲,乙餐厅的概率均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a61c66188d19bf2b2b7ab177be7cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32be9591e72e196813dea4242226988.png)
(i)求第2天他去乙餐厅用餐的概率;
(ii)求第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729881c9561e9d002923d87bb2a6e211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d942107496f87f27abe592d8c3c1a0.png)
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7 . 在边长为2的正方形
中,
,
分别为
,
的中点,沿
、
及
把这个正方形折成一个四面体,使得
、
、
三点重合于点
,得到四面体
,顶点
在底面
上的射影为
,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922dae27e2bef111979574e15de3a4cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() |
B.点![]() ![]() |
C.点![]() ![]() |
D.![]() |
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解题方法
8 . 已知平面向量
,
,且
,
,向量
满足
,则
取最小值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a5451e35042092a0cdc5971a4d55e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37157acb52896b1d3d067adc7d381b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d3e5619718e1bb2592caf48bcc2718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5b0a4509691f41732a190fceef0175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
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9 . 如图所示数阵,第
行共有
个数,第
行的第1个数为
,第2个数为
,第
个数为
.规定:
.
(2)从第1行起,每一行最后一个数依次构成数列
,设数列
的前
项和为
,是否存在正整数
,使得对任意正整数
,
恒成立?如存在,请求出
的最大值;如不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5726ebd95b22e5f7971028479790df77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0623207595425920f16e76a7f8f268b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29a285201fd7e0ad70fa7431cb89a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0749c4129afc0c704155f522290b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee754f9af67705c16c167733b5ef75db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5222268dda9dcb9b660f3cbedbb37757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ef9ec4340eabb42722042c65cc60d8.png)
(2)从第1行起,每一行最后一个数依次构成数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e8660fb54ba32b037b392b75316087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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10 . 已知函数
,
(1)讨论
的单调性;
(2)若
存在两个零点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
(ⅰ)求a的取值范围;
(ⅱ)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2ee3664a4cd7fd377b23485fd14c83.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
(ⅰ)求a的取值范围;
(ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9d26d79e6a09476dc5a0d372c24867.png)
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2卷引用:广东省佛山市南海区第一中学2023-2024学年高二下学期阶段三暨期末统考模拟检测数学试题