489.2) 6⋅1/4⋅8−3⋅2/5⋅5/2+22/5+7/12

6⋅1/4⋅8 = 12, 3⋅2/5⋅5/2 = 3. Сложение: 12 - 3 + 22/5 + 7/12 = 9 + 22/5 + 7/12 ≈ 10,45