两道数学机井题

guojunnz

两道数学机井题,请高人帮写一下解题思路呗? 谢啦!!!

1.The function f is defined for each positive three-digit integer n by f(n) = 2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively.  If m and v are three-digit positive integers such that f(m)=9f(v), them m-v=?
(A) 8
(B) 9
(C) 18
(D) 20
(E) 80

2.when N is divided by 10,the remainder is 1, when divided by 3,remaider 2. what is the remainder when N is divided by 30?

unclekin

以下是引用guojunnz在2006-11-5 3:34:00的发言：

两道数学机井题,请高人帮写一下解题思路呗? 谢啦!!!

1.The function f is defined for each positive three-digit integer n by f(n) = 2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively.  If m and v are three-digit positive integers such that f(m)=9f(v), them m-v=?
(A) 8
(B) 9
(C) 18
(D) 20
(E) 80

2.when N is divided by 10,the remainder is 1, when divided by 3,remaider 2. what is the remainder when N is divided by 30?

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=204472&page=1

第一题见5楼