GRE中数学部分质数的问题column A:the number of distinct prime factors o
GRE中数学部分质数的问题 column A:the number of distinct prime factors of 4x(4x中包含的质数) column B:the number of distinct prime factors of x(x中包含的质数) x08x is an even integer. the columns are equal,但我不太明白.