1. If K is positive integer, is k the square of an integer?
(1) k is divisible by 4
(2) k is divisible by exactly 4 different prime numbers
2. The function f is defined for each positive three-digit integer n by f(n)=2^x3^y5^z, where x, y, z are the hundreds, tends, and units digits of n respectively. If w and v are three-digit positive integers such as f(m)=9f(v), them m-v =?
a. 8
b. 9
c. 18
d. 20
e. 50作者: himba 时间: 2004-10-23 12:57
