老师：你知道怎么把这个小数转化为分数吗？
Teacher: Do you know how to change the decimal into a fraction?
如果我们得到的数据不能转化为简单的百分数怎么办？
What if the data we get back can’t be modeled as a simple percentage?
有理数运算程序 设计内容：有理数是一个可以化为一个分数的数，例如2/3，533/920，-12/49都是有理数。
RATIONAL programming content: is a rational number can be reduced to a fraction of the number, say 2/3, 533/920, -12/49 are rational numbers.
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