在古埃及，人们使用单位分数的和(形如1/a的, a是自然数)表示一切有理数。

如：2/3=1/2+1/6,但不允许2/3=1/3+1/3,因为加数中有相同的。

对于一个分数a/b,表示方法有很多种，但是哪种最好呢？

-In ancient Egypt, the use of unit fractions, and (like the 1/a' s, a is a natural number) that every rational number. Such as: 2/3 = 1/2+1/6, but not 2/3 = 1/3+1/3, because the summand in the same. For a fraction a/b, that There are many ways, but what kind of best?