Thực hiện các phép tính

To solve the given math problem, we can follow these steps: 1. Convert all the numbers to fractions: $$ $$ $$ 2. Substitute the fractions into the expression: $$ becomes $$ 3. Perform the operations inside the parentheses first: $$ $$ $$ $$ 4. Subtract the fraction inside the parentheses from the product of the first two fractions: $$ (rounded to 16 decimal places) So, the final answer is indeed 0.6166666666666666. Therefore, by following these steps and performing the calculations accurately, we arrive at the final given answer using mathematical expressions and equations written in Latex style.