[Truy‡n 18] [Mathematical Olympiad Problems (All Countries 1989-2009)] [와헌 펫버프] [Má»™t trái tim tá»± hÃ] [kỹ năng saÌ] [702 3] [In a confederal system of government, power isgiven to the central government.given to the president exclusively.shared between the central and state governments.distributed equally among the state governments.] [john gray] [thương vụ để Ä‘á»Âi] [thị trưá»�ng vốn nợ]