3,25:3 1/5 = 3,25 ÷ 3 1/5 = 3,25 ÷ (16/5) = 3,25 × (5/16) = 1,015625
6,75 × (47/60 - 2 17/45 + 1,65) = 6,75 × (47/60 - 103/45 + 1,65) = 6,75 × (47/60 - 229/45) = 6,75 × ((4745 - 22960) / (60*45)) = 6,75 × (2115 - 13740) / 2700 = 6,75 × (-11625) / 2700 = -2878,125 / 2700 = -1,065
Итак, 1,015625 + (-1,065) = -0,049375.
Ответ: -0,049375
3,25:3 1/5 = 3,25 ÷ 3 1/5 = 3,25 ÷ (16/5) = 3,25 × (5/16) = 1,015625
6,75 × (47/60 - 2 17/45 + 1,65) = 6,75 × (47/60 - 103/45 + 1,65) = 6,75 × (47/60 - 229/45) = 6,75 × ((4745 - 22960) / (60*45)) = 6,75 × (2115 - 13740) / 2700 = 6,75 × (-11625) / 2700 = -2878,125 / 2700 = -1,065
Итак, 1,015625 + (-1,065) = -0,049375.
Ответ: -0,049375