1. Выполните деление: а) 5/6 : 2/3; б) 1 1/3 : 2 2/9.

Ответ:

а) (5/6) : (2/3) = (5/6) * (3/2) = 15/12 = 5/4; б) (1 1/3) : (2 2/9) = (4/3) : (20/9) = (4/3) * (9/20) = 36/60 = 3/5.