请教因数和倍数类型的两道PREP····

xyqirene

If x and y are positive integers, what is the value of xy ?



(1)The greatest common factor of x and y is 10.



(2)The least common multiple of x and y is 18

C

If n and t are positive integers, what is the greatest prime factor of the product nt ?

B

(1)The greatest common factor of n and t is 5.



(2)The least common multiple of n and t is 105.

xyqirene

恩恩··谢谢NN···一定牢记！！