解题方法
1 . 设等比数列
的各项都为正数,
,前n项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86551283c9dfa1c39bdc9b0dd546803.png)
(1)求数列
的通项公式;
(2)令
,求数列
的前n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86551283c9dfa1c39bdc9b0dd546803.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5214360ac0152818f5b95b805f6e615c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec4bdc2a6d4fc387dc621f0b5a268c5.png)
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名校
2 . 某中学高一年级举行了一次数学竞赛,从中随机抽取了一批学生的成绩,经统计,这批学生的成绩全部介于50至100之间,将数据按照
,
,
,
,
的分组作出频率分布直方图如图所示.
(1)求频率分布直方图中a的值,并估计本次竞赛成绩的中位数和平均数;
(2)若按照分层随机抽样从成绩在
的两组中抽取6人,再从这6人中随机抽取2人,求至少有1人的成绩在
内的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/486c7705dbd7b7b9ec5dd17b4891088b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea146d8ec45e63ad14683fd31064de66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77699e3d1ddc6e698a640573a7ef787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d90faf85d1548242098a6fe3accd84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1a32a9f2b04fc931c6a0da0b7485e2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/d5464b05-8ac1-496a-9bcc-94d024435d11.png?resizew=236)
(1)求频率分布直方图中a的值,并估计本次竞赛成绩的中位数和平均数;
(2)若按照分层随机抽样从成绩在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc920f1c050735f5108ab1aaf866367e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1a32a9f2b04fc931c6a0da0b7485e2.png)
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2024-02-23更新
|
465次组卷
|
2卷引用:江苏省徐州市沛县湖西中学2024届高三上学期第三次学测模拟数学试题
名校
解题方法
3 . 在三棱锥
中,三条侧棱PA,PB,PC两两垂直,且
,若三棱锥
的所有顶点都在同一个球的表面上,则该球的体积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b4c1ae9c57d51e27bbdb001122d3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 下列说法中正确的是( )
A.任取![]() ![]() |
B.图象经过![]() |
C.在同一坐标系中,函数![]() ![]() ![]() |
D.方程![]() |
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解题方法
5 . 已知抛物线C:
的焦点为
,
是抛物线
上一个动点,点
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22962a2ad892cb6b14ab039a06e8cdc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
A.若![]() ![]() |
B.过点![]() ![]() |
C.![]() ![]() |
D.抛物线C:![]() |
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6 . 已知椭圆C:
(
)的一个焦点为
,且离心率为
.
(1)求椭圆
的方程;
(2)直线l:
与椭圆C交于A,B两点,若
面积为
,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92f0e0012a7696c78e3e00513edefd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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7 . 化简求值:
(1)
;
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd964c0d0d2b109cdcaf646875ed296.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30ace21be161ac7ebc632779602ab4.png)
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解题方法
8 . 下列说法正确的是( )
A.函数![]() |
B.函数![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() |
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解题方法
9 . 已知函数
,
,
.若不等式
的解集为
.
(1)求
的值及
;
(2)判断函数
在区间
上的单调性,并利用定义证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634952be20c76e0701e80675318830fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf8c379fca9b3f1c46c47dd28e8cfdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855c51180ea4f0b8e59d4b0a059eb765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8521a424dfa94914344a5e07f48a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa66623cf54b42d6d12be4c8edaa7071.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
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解题方法
10 . 已知函数
.
(1)若
的解集是
或
,求实数
的值;
(2)当
时,若
时函数
有解,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8721d2ca55d4a704b312cd40624119a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a0be7c685173bb048e36cf8bdae7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a884b4f8abcd59336c71e5429fa75fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8910764b918689baba18b420099c670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/792f2125962ebf3b51646247f42a5425.png)
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