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[]将循环节提取出来-To a fraction A/D, A for the molecule, D is the denominator, will dissolve into the simplest fractional form, such as 1/3 = 0. [3], into a recurring decimal form, and [] will be extra