6) (1 1/13 - 2 3/4) * 26

6) \((\frac{14}{13} - \frac{11}{4}) \cdot 26 = (\frac{56}{52} - \frac{143}{52}) \cdot 26 = \frac{-87}{52} \cdot 26 = \frac{-87}{2} = -43\frac{1}{2}\)
Ответ: -87/2