7除以8余-1,除以9余-2
考虑7,8,9的最小公倍数为7*8*9=504,则504-7=497就是解在帮个忙吧2009 apples are distributed among a number of children so that each child gets a different positive mumber of apples.How many children are there at the most?Answer:就是n个互不相同的数的和么我觉得求1+2+...+n 看看最靠近2009的数所以f(n)=1+2+...+nf(n)=n(n+1)/2f(60)=1830f(61)=1891f(62)=1953f(63)=2016所以最多只有62个小朋友，其中最后一个下朋友拿62+2009-1953个