从1,2,3,.49,50这50 个数中,取出若干个数使其中任意两个数的和都不能被7整除,最多可取多少个数?

可以设兔子有x只,小鸡有y只.
x+y=50
4x+2y=140
解这两个方程就可以了.x=20 y=30
就是兔子有20只,小鸡有30只.

Last summer holiday, I went to London for a trip. I went there by train and made a friend with a girl on the
train. London is so beautiful, I took a lot of pictures. When it was hot, I often went swimming. I also went
shopping and bought many things. I had a lot of fun on my holiday.
答案不唯一

看赛制
循环赛n（n-1)/2,那么50*49/2=1225场~~~~
一般超过8人都不推荐用循环的~~
如果想快单淘汰罗50-1=49场~~~
不过单淘汰太快,种子安排也很难合理~~~
相对适合的是小组循环出来打淘汰
50个人可以分8组,6个组六人,2个组7人
每组取前两名,出来就是16强,小组1,2名交叉打~~~~
场数自己算吧~根据上面循环和淘汰的场次计算法则~~~

There are four people in my family.They are my father,mother,brother and me.My father and mother both worker.My brother is very young,I am a student.My favorite food is hamburger.I like swimming very ...

The United States is one of the world's largest cities, a total of 50 states, called the United States of America (The United States of America).
New York
New York City is the nation's largest city, New York is a city of immigrants, pure and simple, because of the size of the cities and big and the rich more than the "Big Apple" nickname. More than half of the residents are immigrants, about 2 million of them black, more than 400,000 Chinese.
Los Angeles
Los Angeles (Los Angeles) is Spanish, which means angel, the Americans called the Los Angeles City of Angels. Los Angeles in the United States, the west coast, the southern part of California, is the second largest city in the United States.

10÷20=0.5=50%

因为小强是比小芳少1/8，所以应该计算为：48减去48乘以1/8等于42。

设桌面X,桌脚Y
则：
（1/50）X+（1/300）Y=5.式1
4X=Y.式2
式2代入式1：
（1/50）X+（1/300）4X=5
通分：
（1/300）6X+（1/300）4X=5
合并：
（10/300）X=5
解得：X=150
代入X,得：Y=600

Last summer holiday, I went to London for a trip. I went there by train and made a friend with a girl on the
train. London is so beautiful, I took a lot of pictures. When it was hot, I often went swimming. I also went
shopping and bought many things. I had a lot of fun on my holiday.
答案不唯一

#include
int main(int argc,char * argv[])
{
int a =f(50);
printf("The fifty number is %dn",a);
return 0;
}
int f(int x)
{
if (x==1||x==2)
return 1;
else
return (f(x-1)+f(x-2));
}