marcinkevich_maksim

To solve this expression, let's break it down step by step: 1. Start by simplifying the expression inside the parentheses: 1(целая) 2/3 : 2.5 - 3. - First, convert the mixed number 1(целая) 2/3 to an improper fraction: 1(целая) 2/3 = 5/3. - Next, divide 5/3 by 2.5: 5/3 ÷ 2.5 = 5/3 × 2/5 = 10/15 = 2/3. - Finally, subtract 3 from 2/3: 2/3 - 3 = 2/3 - 9/3 = -7/3. 2. Now, let's simplify the expression further: 7,5 + 2(целых) 1/2 • (-7/3). - First, multiply 2(целых) 1/2 by -7/3: 2(целых) 1/2 • (-7/3) = 2(целых) 1/2 • (-7/3) = -7/3 + 7/2 = -14/6 + 21/6 = 7/6. - Next, multiply 7,5 by 1: 7,5 • 1 = 7,5. - Finally, add 7,5 and 7/6: 7,5 + 7/6 = 45/6 + 7/6 = 52/6 = 26/3. Therefore,