Ë) (1/2 + 0,8 - 3/5) * (3 + 5 8/25 - 0,12)

1. Convert decimals to fractions: (1/2 + 4/5 - 3/5) * (3 + 133/25 - 12/100)

2. Simplify within parentheses: (1/2 + 1/5) * (3 + 532/100 - 12/100) = (7/10) * (3 + 520/100) = (7/10) * (3 + 5.2) = (7/10) * 8.2

3. Multiply: (7/10) * (82/10) = 574/100 = 5.74