名校
1 . 泊松分布是一种重要的离散型分布,用于描述稀有事件的发生情况.如果随机变量
的所有可能取值为0,1,2…,且
,
其中
,则称
服从泊松分布,记作
.
(1)设
,且
,求
;
(2)已知当
,
时,可以用泊松分布
近似二项分布
,即对于
,
,当
不太大时,有
.
(ⅰ)已知甲地区共有100000户居民,每户居民每天有0.00010的概率需要一名水电工.试估计某天需要至少2名水电工的概率;
(ⅱ)在(ⅰ)的基础上,已知乙地区共有200000户居民,每户居民每天有0.00004的概率需要一名水电工.试估计某天两个地区一起至少需要3名水电工的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d9506436f1f7db2b7c20a84f9a5f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4988011c1e60a6256c25c3bdff4bd352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a0f8d6451376d85c0f432c74faf33.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a0f8d6451376d85c0f432c74faf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a80cdc7e5d4067d00dff0a0b347b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e39326381d0fbd83c8156c3b33e74eb.png)
(2)已知当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4fe5a95acf4db3241c6cba652e1589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9529cc68a2f219ea5e6f467af4b6e8d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9edd73921106b5c092f6b685ada1f5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3821cada1948964a9741005833f52d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989602dd198d2cb52fc1875921d56ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761ddcffd715d75da2c739fe67fa3a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6c010e17368e545d63217810ffc8fb.png)
(ⅰ)已知甲地区共有100000户居民,每户居民每天有0.00010的概率需要一名水电工.试估计某天需要至少2名水电工的概率;
(ⅱ)在(ⅰ)的基础上,已知乙地区共有200000户居民,每户居民每天有0.00004的概率需要一名水电工.试估计某天两个地区一起至少需要3名水电工的概率.
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2 . 设点
(
)是抛物线
上任意一点,过点
作抛物线
的两条切线,分别交抛物线
于点
和点
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b8e0e181de2dfa47561cc534287eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c16dac1e9bf5804c8907cbc59014d04.png)
A.![]() | B.![]() |
C.![]() | D.直线![]() ![]() |
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解题方法
3 . 如图所示是一个以
为直径,点
为圆心的半圆,其半径为4,
为线段
的中点,其中
,
,
是半圆圆周上的三个点,且把半圆的圆周分成了弧长相等的四段,若将该半圆围成一个以
为顶点的圆锥的侧面,则在该圆锥中下列结果正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77e9c89b7275b0c1a9af5c9a72e5968.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.点![]() ![]() ![]() |
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解题方法
4 . 入春以来,成群的红嘴鸥在河北省阜平县平阳镇王快水库栖息飞翔,碧水鸥影的生态美景,吸引众多游客前来打卡,为了更好地保护红嘴鸥,渔民自发地驾船在王快水库巡护红嘴鸥.已知甲、乙等六名渔民计划巡护红嘴鸥六天,每人巡护一天,
(1)若甲不在第一天巡护,问有多少种不同的巡护方案?
(2)若甲、乙不在相邻的两天巡护,问有多少种不同的巡护方案?
(1)若甲不在第一天巡护,问有多少种不同的巡护方案?
(2)若甲、乙不在相邻的两天巡护,问有多少种不同的巡护方案?
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5 . 某校运动会短跑比赛有两个项目:100米短跑和400短跑.甲参加100米短跑比赛的概率为0.7,参加400米短跑比赛的概率为0.3,且甲参加100米短跑比赛夺冠的概率为0.7,参加400米短跑比赛夺冠的概率为0.8,则甲参加短跑比赛夺冠的概率为______ .
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解题方法
6 . 当一束光通过一个吸光物质(通常为溶液)时,溶质吸收了光能,光的强度减弱;吸光度就是用来衡量光被吸收程度的一个物理量,其影响因素有溶剂、浓度、温度.分析物浓度越高,穿过材料的光子被吸收的机会就越大.吸光度的测量简便高效,因此被广泛应用于液体和气体的光谱测量技术,集成至工业测试系统,还可以用于科研分析.其中透光率是指光子通过物体的能量占发出光能量的比例.在实际生产和生活中,通常用吸光度
和透光率
来衡量物体材料的透光性能,著名的朗伯—比尔定律表明了两者之间的等量关系为
,其中,
是吸光度,
为透光率,
为入射光强度,
为透射光强度,某化学有机高分子材料研究所测得了如下表不同有机高分子材料的透光率:
设塑料、纤维、薄膜的吸光度分别为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b7dfc75ad72cf2d33c9c8a3a048faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84abbfb85a00f48b5db11eeb76b8d134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
有机高分子材料 | 塑料 | 纤维 | 薄膜 |
0.6 | 0.7 | 0.8 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20857ff22008ba1b9900bf65ce6f5cb8.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
真题
7 . 对于一个函数
和一个点
,令
,若
是
取到最小值的点,则称
是
在
的“最近点”.
(1)对于
,求证:对于点
,存在点
,使得点
是
在
的“最近点”;
(2)对于
,请判断是否存在一个点
,它是
在
的“最近点”,且直线
与
在点
处的切线垂直;
(3)已知
在定义域R上存在导函数
,且函数
在定义域R上恒正,设点
,
.若对任意的
,存在点
同时是
在
的“最近点”,试判断
的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d6bb01f1044358cc5fee441bc62489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e75192ed6ee73f295754edfbbb4a4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25be20e3724274132cb83b16deaeecfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6085b118b86f7f4dd54864e113cd595c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7bce420cf236e5f429afee284239010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3641338ac7fd85ef574690ba1f988d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6be4ab05ff885a4a6a043eaebe7a91b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf6463a6ee745687de1ee10f4d40253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90183525765a8279328417af4bf6179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf039c46a25e331446c6ee1e9af3c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237c115d5b39d761e1cbcae031070b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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8 . Gompertz曲线用于预测生长曲线的回归预测,常见的应用有:代谢预测,肿瘤生长预测,有限区域内生物种群数量预测,工业产品的市场预测等,其公式为:
(其中
,
为参数).某研究员打算利用该函数模型预测公司新产品未来的销售量增长情况,发现
.若
表示该新产品今年的年产量,估计明年
的产量将是今年的
倍,那么
的值为(
为自然数对数的底数)( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aff30671a6b9e06d72228460819f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8ed1718781504ad5647f33642b191c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ffecb03c47be920254c4ccffa5b222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3771a38cf379d60c8d51687db3d035c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
9 . 某同学参加科技知识网络挑战赛,依次回答从系统题库中随机选择的试题,每题作答完毕后,可以选择继续答题,或者结束比赛,系统计算比赛得分.已知该同学答对每道题的概率均为
,且每次答题相互独立.
(1)已知
,若该同学连续作答30道试题后结束比赛,记该同学答对
道试题的概率为
,则
为何值时,
取得最大值?
(2)已知
,若该同学选择连续作答
道试题后结束比赛的概率为
,
,求该同学恰好答错2道试题的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44fed1be8b7e50f18cb90077d9fce8e4.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74b0aa7a6f6dcab7d9101b98504ae2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f81f2a0196b06fc56a7e8a6463d179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f81f2a0196b06fc56a7e8a6463d179.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a18d2bd429301b5478dcd26c572266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f16923163f3c948a4cc4a713bc1160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7304f4a3860fb2ce6535b51166d21446.png)
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解题方法
10 . 对给定的实数a,b,q,其中
,
.如果函数
,
:满足(1)对任意的
,
且
;(2)对任意的
,
.则称
为在区间
上的一个“q-压缩函数”.区间
上所有“q-压缩函数”构成的集合记作
.
(1)判断下列函数,是否属于集合
?(直接写出结论)
①
②
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80e8d2d66b432fd2b8a2830ba21e5dd.png)
(2)设
,若
求实数a的取值范围.
(3)设
.若对任意的
,
,均有
,求M的最小值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae99e050d0f1cfc0447304f06424d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e207cf62e3a7e282eac4c4a3455bbf9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48318c1b3f9dffc48e3ce0626b277e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/664c92988d61280ed12488f270151940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a8b4f05d2ba1a5514ebf390dbbd325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a293e0b4f751f4102c795b567a633194.png)
(1)判断下列函数,是否属于集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c564b7a711c6ac5945a0d41b2564c8.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a740cdaca0afce73f68c890f86acc6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef72cf8297d91045117d50b4e9d3476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80e8d2d66b432fd2b8a2830ba21e5dd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0e64d809acabedccf8a8516ff8b6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c109bacd687055d3a6a79978dfa7c0e.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e39b23fb1290ed449f1700c42c3efc6.png)
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