任何一个有理数都可以写成有限小数或无限循环小数的形式.反之任何一个无限循环小数都可以化为分数.小学我们就曾学习过转化的公式,但你知道公式是如何得来吗?下面我们借助方程加深对公式的认识和掌握.1.化纯循环小数为分数 Any rational number can be written as a finite decimal or infinite loop decimal form. Conversely, any one infinite loop decimal can be converted to a fraction of primary school we have learned transformation formula, but do you know the formula is how come? Here we use Equation to deepen the understanding of the formula and mastery. 1 pure cycle decimal fraction