For this problem, the symbol § between two numbers, x and y, is defined as follows: x § y = (x + y) ÷ 2. As in ordinary arithmetic, do operations within parentheses before operations outside parentheses. Find (11 § (8 § 2)) § 22.
cac ban hieu ko minh cha hieu cac ban hieu thi giai nha va ket ban voi minh