说明：  给定一个分式A D,A为分子,D为分母,将分式化解成最简形式,例如1 3 0 [3],化成循环小数形式,并用[]将循环节提取出
(Given a fraction A DU A as a molecule and D as the denominator, the fraction is resolved into the simplest form, such as 130 [3], into a cyclic decimal form, and the cyclic node is extracted by [].)