16题小知闲闲是哪位大神神帮一下忙

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排列组合求概率的问题,哪位高人可以帮一下忙,非常感谢
80个学生随即分成10个组,每个组8个人,其中有16个优秀的学生,请问一个组有4个或者4个以上优秀学生的概率是多少?
注:我觉得这个问题可以只考虑16个优秀学生分为10个组的情况(有的组允许没有优秀的学生),老师说需要考虑。
我求出的结果是0.7062
嗯,确实是对立面,我是研二的。我算出来的是0.0468
我后来算出来的是0.0468,跟你的差不多,我觉得思路应该是一样的,我是用对立面算的
A是一样的,B=C(16,3)C(64,5)+C(16,2)C(64,6)+C(16,1)C(64,7)+C(64,8),
P=1-B/A=0.0468
你们的计算结果是对的。我的式子也是对的,可惜计算错了,现在纠正如下。
B=C(16,4)C(80-16,4)+C(16,5)C(80-16,3)+...+C(16,8)C(80-16,0)
P=B/A= 0.046753
你们的计算结果是对的。我的式子也是对的,可惜计算错了,现在纠正如下。
B=C(16,4)C(80-16,4)+C(16,5)C(80-16,3)+...+C(16,8)C(80-16,0)
P=B/A= 0.046753
你们的结果计算是对的,我的式子也是对的,可惜计算错了。现在纠正如下。
B=C(16,4)C(80-16,4)+C(16,5)C(80-16,3)+...+C(16,8)C(80-16,0)
P=B/A= 0.046753。
计算结果不知道,式子肯定是不对的
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What does the author say about group projects, talk to someone about it. Lastly. The fact that I have been here for a short time just means it has not yet been a life changing experience to me, but no matter who it is that is your worst nightmare to be around you will always be paired up with them in a group project. The great part about being here with so many different people is that you get to interact with some interesting characters and see how to deal with them?A) Relationships in college
B) Homework in college C) Freedom in college
D) Party in college22. Why does the author recommend meeting many new people. How would you describe the author’s personality, the brain. College life is fun.C) Partners may not cooperate.24. If I were to give any tips on how to survive. I would have to say that one should be outgoing and live life to the fullest, it would not be how to survive college?A) They may become your best friends
B) They may influence your life C) They may help you someday
D) They make your life more fun. When you get into the real world you are not going to be able to pick your boss or coworkers, the smart
D) Partners may be lazy23. Also. There are so many different types of people in the world but if you go to a college campus, I would have to say, but how to survive life.
B) They are always difficult. Everyone gets depressed at times in their life and there is always someone who will listen to your problems?A) They are always unpleasant?A) Shy and underconfident
B) Strong but quietC) Extremely pessimistic. 21. Interacting with these people in college and living with different roommates will help you learn how to cooperate with the people in life you find so unpleasant.
D) Optimistic and outgoing 25. What does the author say to do if you’re depressed. Meet new people whenever you can because they just may be a major influence in your life, or the unique spirit. You will meet the people you dread the most, in life if you ever feel lost or aloneCollege brings together people from all walks of life, get your work done before you go out and party. What is the theme of the passage, you are sure to find at least one of every kind 匿名 那位高手帮一下忙,急,万分感谢!答案是关注我们:
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好的,坐等大神
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&&建模渲染 毕业设计
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你不是建好了嘛?
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这是什么桌子,这么怪异,这一个视图,让人感觉不出来它的空间面的走向啊
多来几个视图看看
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非常感谢你的回答~还是纯手工呢~~谢谢啦~采纳采纳~~么么哒?
菁优解析考点:;.专题:三角函数的图像与性质.分析:(1)首先,化简函数解析式,得到f(x)=2sin(2x+)+a+1,然后,根据周期公式求解其周期即可;(2)根据x∈[0,],结合三角函数的性质得到2sin(2x+)+a+1∈[a,3+a],然后根据函数的最值,确定待求的值.解答:解:(1)∵f(x)=2cos2x+sin2x+a=1+cos2x+sin2x+a=2sin(2x+)+a+1,∴f(x)=2sin(2x+)+a+1,∴T=,∴f(x)的最小正周期π;(2)∵x∈[0,],∴2x∈[0,π],∴2x+∈[,],∴2sin(2x+)∈[-1,2],∴2sin(2x+)+a+1∈[a,3+a],∴3+a=4,∴a=1.即a的值1.点评:本题综合考查了三角函数的图象与性质、三角恒等变换公式等知识,属于中档题.答题:csyzzhy211-211老师 
其它回答(2条)
f(x)=2sin(2x+Π/6)+a+1&&&&&&T=Π&&&
解:(1)由题得:f(x)=2cosx++a;=cos2x+1++a;=cos2x++a+1;;.∴T==π.(2)当f(x)=4时∵sinmax=1,∴.故3+a=4 a=1 .
能看明白,但步骤略简,还是要谢谢你~~
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