3/5*(2 целых 2/3:3 целых 1/5) = (1/3_5/16) :(1/6_1/8) =

1) 3/5 * (2 2/3 : 3 1/5) = 3/5 * ((2 * 3 + 2)/3 : (3 * 5 + 1)/5) = 3/5 * (8/3 : 16/5) = 3/5 * (8/3 * 5/16) = 3/5 * (8 * 5)/(16 * 3) = 3/5 * 5/6 = 3/6 = 1/2;

Ответ: 1/2.

2) (1/3 - 5/16) : (1/6 - 1/8) = (16/48 - 15/48) : (4/24 - 3/24) = (16 - 15)/48 : (4 - 3)/24 = 1/48 : 1/24 = 1/48 * 24 = 1/2;

Ответ: 1/2.