3 /5 : ( − 4 /15 ) =

To solve this mathematical expression, we need to follow the order of operations, which is PEMDAS in Russian: 1. Parentheses (Скобки) 2. Exponents (Степени) 3. Multiplication and Division (Умножение и Деление) 4. Addition and Subtraction (Сложение и Вычитание) Now, let's calculate 3/5 - (-4/15). To subtract fractions, we need a common denominator: 3/5 - (-4/15) = (9/15) - (-4/15). Using the same denominator, we get: 9/15 + 4/15 = 13/15. Therefore, the result of the expression 3/5 - (-4/15) is 13/15. If you have any more questions or need further clarification, feel free to ask!