11) 2/3 · (3/4 + 3/50) =

(2/3) · (3/4 + 3/50) = (2/3) · 3/4 + (2/3) · 3/50 = 1/2 + 1/25 = 25/50 + 2/50 = 27/50.

Ответ: 27/50