5.463 Найдите произведение:

a) 4/7 * 7/25 = 4/25
б) 2/3 * 9/8 = 3/4
в) 4/11 * 11/4 = 1
г) 21/8 * 13/14 = 39/16
д) 2/11 * 3/4 = 3/22
е) 10/3 * 7/100 = 7/30