998/999*998
问题描述：
998/999*998
求这道题的简便算法
答
=（999-1）^2/999 = (999^2 - 2*999 + 1)/999 = 999 - 2 + 1/999 =997 +1/999
998/999*998
求这道题的简便算法
=（999-1）^2/999 = (999^2 - 2*999 + 1)/999 = 999 - 2 + 1/999 =997 +1/999