形如(1/n)(n是自然数,n>1)的分数称为单位分数。我们知道(1/n)=(1/(n+1))+(1/(n(n+1)))与(1/n)=(1/(n-1))-(1/n(n-1)),即n>1时,单位分数(1/n)都可以表示为另外两个单位分数之和,n>2时,单位分数(1/n)都可以表示为另外两个单位分数之差。相应地,一个单位分数可以表示为几个单位分数的代数和。本文旨在用简单的代数方法说明将一个单位分数表示成两个单 The fraction of the form (1 / n) (n is a natural number and n> 1) is called a unit score. (1 / n) = (1 / (n + 1)) + (1 / (n (n + 1))) and (1 / n) = (1 / (n- 1)) - n (n-1)), that is, when n> 1, the unit fraction (1 / n) can be expressed as the sum of the other two unit fractions, and when n> 2, the unit fraction The difference between the two units. Accordingly, a unit score can be expressed as an algebraic sum of several unit scores. The purpose of this article is to illustrate a unit score as two singletons using a simple algebraic method