|-3\(\frac{1}{4}\)| ⋅ |-4| - |2,5| ⋅ |-1| = 3\(\frac{1}{4}\) ⋅ 4 - 2,5 ⋅ 1 = \(\frac{13}{4}\) ⋅ 4 - 2,5 = 13 - 2,5 = 10,5
Ответ: 10,5