(3 1/8 - 2 5/12) · (-1 3/17) = -5/6
1) 3 1/8 - 2 5/12 = 3 3/24 - 2 10/24 = 2 27/24 - 2 10/24 = 17/24
2) 17/24 · (-1 3/17) = 17/24 · (-20/17) = -20/24 = -5/6
ответ: (-5/6).
