名校
解题方法
1 . 每年6月中旬到7月中旬,长江中下游区域内会出现一段连续阴雨天气,俗称“梅雨期”.依据某地
河流“梅雨期”的水文观测点的历史统计数据,所绘制的频率分布直方图如图甲所示;依据当地的地质构造,得到水位与灾害等级的频率分布条形图如图乙所示.
河流在“梅雨期”水位的第80百分位数并估计该地在今年“梅雨期”发生1级灾害的概率;
(2)该地
河流域某企业,在今年“梅雨期”,若没受1,2级灾害影响,利润为1000万元;若受1级灾害影响,则亏损200万元;若受2级灾害影响则亏损2000万元.
现此企业有如下三种应对方案:
试问,若仅从利润考虑,该企业应选择这三种方案中的哪种方案?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)该地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
现此企业有如下三种应对方案:
方案 | 防控等级 | 费用(单位:万元) |
方案一 | 无措施 | 0 |
方案二 | 防控1级灾害 | 80 |
方案三 | 防控2级灾害 | 200 |
您最近一年使用:0次
名校
解题方法
2 . (1)计算:
;
(2)求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afaebeb7c6c32ad9b9d84778b88d5da.png)
(2)求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781cc7e1e3798d6a472deedaf26f76a6.png)
您最近一年使用:0次
名校
解题方法
3 . 设
,我们常用
来表示不超过
的最大整数.如:
.
(1)求证:
;
(2)解方程:
;
(3)已知
,若对
,使不等式
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9322dd8f56b5f8d2c667fdf0d4a9f9aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f161c2a3717f1b6c62d0d7dae0b606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0147928001a2b80afcd6c28c8091cf91.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d959974d562cb9ef138676ae943bc19c.png)
(2)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8300c3dc2f5674dddbaa768109142592.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48da06492a0b0c8a31a5dc1531e8f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb945c963b0d56df9d784d3e3288c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a9d89ec3d1181091ea159b40952b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2024-03-13更新
|
571次组卷
|
4卷引用:湖北省云学名校联盟2023-2024学年高一下学期3月联考数学试卷
名校
4 . “物不知数”是中国古代著名算题,原载于《孙子算经》卷下第二十六题:“今有物不知其数,三三数之剩二:五五数之剩三;七七数之剩二.问物几何?”问题的意思是,一个数被3除余2,被5除余3,被7除余2,那么这个数是多少?若一个数
被
除余
,我们可以写作
.它的系统解法是秦九韶在《数书九章》大衍求一术中给出的.大衍求一术(也称作“中国剩余定理”)是中国古算中最有独创性的成就之一,现将满足上述条件的正整数从小到大依次排序.中国剩余定理:假设整数
,
,…,
两两互质,则对任意的整数:
,
,…,
方程组
一定有解,并且通解为
,其中
为任意整数,
,
,
为整数,且满足
.
(1)求出满足条件的最小正整数,并写出第
个满足条件的正整数;
(2)在不超过4200的正整数中,求所有满足条件的数的和.(提示:可以用首尾进行相加).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bfa96cf7f45afec8a40d3fe7e24f509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ab1256702aef4e9f1a5eb6c12ecc96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd67f60f04c278bdd867fdb3979dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a625b91e0eba33b107550ee2a1e2f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a135cb036833400f3fa1edc92d5ce410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e034e96fafe12d9aadca06c029ee87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc0d6dc164a597aa467bc2a82d09719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c462cd0fa26921b316bc436f4e6ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d4b9cf64ea7a6171db43eec4e5637a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90c998886b1483221a5b4941f6e874c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3a3c25d32c153f1170e5bcdb10f849.png)
(1)求出满足条件的最小正整数,并写出第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)在不超过4200的正整数中,求所有满足条件的数的和.(提示:可以用首尾进行相加).
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2024-02-23更新
|
734次组卷
|
4卷引用:湖北省襄阳市第五中学2024届高三下学期开学考试数学试题
湖北省襄阳市第五中学2024届高三下学期开学考试数学试题云南省昆明市第一中学2023-2024学年高一上学期入学考试数学试题(已下线)压轴题高等数学背景下新定义题(九省联考第19题模式)练贵州省毕节市金沙县部分学校2024届高三下学期高考模拟(六)数学试题
解题方法
5 . 已知函数
.
(1)当
时,讨论
的单调性;
(2)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72dbbcac3a8dcced8e9734265246beb.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48263f24da5420576e76038d19c13026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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6 . 欧拉函数
的函数值等于所有不超过正整数n,且与n互质的正整数的个数(互质是公约数只有1的两个整数),例如:
,
.
(1)求
,
,
;
(2)若数列
满足
,且
,求数列
的通项公式和前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad13428d2891b2bccd870f2a8061f77d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3259dd516a84738bee81d75c00f77c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53e72365953a1fb223b7255cc43e6f0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f94b4c9f4a43efa5a2067d5b80b3a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e241910ad541a135634e03ceebd0abd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14981a6f80bcbfa1dba86e21d57df8a8.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46255b5a6af66e73d2f5c314377c22d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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7 . 连续地随机掷1颗骰子,一直掷到6点出现3次为止.用
表示停止时已经掷的次数.
(1)求
的分布列
,
;
(2)令
,求数学期望
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8e35363f3d15d210b3d2ef869b0119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b84a53fc740b3f74a019bbe321f60a.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4daac4ff808563e477a888a50461247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71701db4b413f2364dbcbd612fbc8a67.png)
您最近一年使用:0次
8 . 已知函数
.若
是区间
上的单调增函数,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6064bbd858852c78970fbbf34d4f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ead3fdcb8fe8f5eb3dbe7d96cabc28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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9 . 设
为椭圆
:
的左焦点,
为椭圆
上的一点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/bde87b06-24bb-45fc-b5c4-4e8bac5b393b.png?resizew=188)
(1)作正方形
(
,
,
,
按逆时针排列)当
沿着椭圆运动一周,求动点
的轨迹方程.
(2)设
为椭圆外一点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/bde87b06-24bb-45fc-b5c4-4e8bac5b393b.png?resizew=188)
(1)作正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857e804aac2f81757178d237485299fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fdf0b6fecd6a78bc83f42e11e60a004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d968044241d03105c05c40fd6b94264.png)
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10 . 设
皆为正数,且满足
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add4adf39316ddd272f0ded66298a76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad66c517cf8d3bf8c33ccd82e42cb92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084b5ecacb0679361d358e2748033b0e.png)
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