美国数学竞赛题（都英语进）1.At a high school in Germany,80% of all students in the school are male,but only 5% ofthe male students and 10% of the female students are on the math team.If a member ofthe math team is selected at random,with

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美国数学竞赛题（都英语进）1.At a high school in Germany,80% of all students in the school are male,but only 5% ofthe male students and 10% of the female students are on the math team.If a member ofthe math team is selected at random,with

美国数学竞赛题（都英语进）1.At a high school in Germany,80% of all students in the school are male,but only 5% ofthe male students and 10% of the female students are on the math team.If a member ofthe math team is selected at random,with
美国数学竞赛题（都英语进）
1.At a high school in Germany,80% of all students in the school are male,but only 5% ofthe male students and 10% of the female students are on the math team.If a member ofthe math team is selected at random,with each member of the team having an equal
chance of being selected,compute the probability that the selected member is male
2.What is the largest integer multiple of 8,no two of whose digits are the same?
最好有solution
第2题，我的理解是一个8的最大倍数，而它的每一个数位都不一样 我自己找到是9876543120

美国数学竞赛题（都英语进）1.At a high school in Germany,80% of all students in the school are male,but only 5% ofthe male students and 10% of the female students are on the math team.If a member ofthe math team is selected at random,with
在一所高中在德国,80%所有学生在学校是男性,但是仅5%男学生和10%女学生在数学队.如果数学队的队员随机被选择,每名队员有均等机会被选择,计算选择的成员是男性可能性
什么是8的最大的整数倍数,没有二数字是相同的?
设该高中学生总数为X.
在数学队中,MALE：80%X*5%=4%X
FEMALE:20%X*10%=2%X
记所选学生为MALE的事件为A.
则P(A)=4%X/(4%X+2%X)=2/3
第二问说实话没看懂.
第二题,你是对的.
求8的最大倍数,不重数字,一定是十位数,只需求8的最小三位数倍数,其它位从高到低把没用到的数字从大到小列出来（8能被1000整除）.

1.
1x0.8x0.05=0.04
1x0.2x0.1=0.02
0.04/(0.04+0.02)=66.7%
2.
只有最小公倍数和最大公约数，没有最大公倍数，你一定要给范围，否则这个题出错了

....哪里来的

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