If the prime numbers p and t are the only prime factors of the integer m, is m a multiple of p2t ?
(1) m has more than 9 positive factors.
(2) m is a multiple of p3.
【答案】B
【思路】
t are the only prime factors of the integer m,m沒有其他質因數,故m為t所組成,有可能為m=t,m=t^2................. (1) m has more than 9 positive factors 可知m＞t^9, 但無法知道和p的關係,NOT sufficient (2) m is a multiple of p^3,p為m的質因數,又t are the only prime factors of the integer m,t=m, m is a multiple of p^3 ,可以写成m is a multiple of p2t,sufficient
无法理解上面那句话~~感觉前面是不是少了p and t。。。作者: piacia 时间: 2010-10-22 20:38
