5.541 Вычислите: a) 5 : 2/3; б) 3/8 : 1/3; в) 1/12 : 5/36; г) 14/55 : 5/21; д) 121/234 : 11/12; е) 9/8 : 5/8 : 3/10.

a) 5 * 3/2 = 15/2 = 7 1/2.
б) 3/8 * 3/1 = 9/8 = 1 1/8.
в) 1/12 * 36/5 = 36/60 = 3/5.
г) 14/55 * 21/5 = 294/275.
д) 121/234 * 12/11 = (11*12)/234 = 132/234 = 22/39.
е) 9/8 * 8/5 * 10/3 = (9*10)/(5*3) = 90/15 = 6.