先从熟悉的入手1/3 + 1/6 = 1/21/12 + 1/24 = 1/8不难看出: (1/3 + 1/6) + 1/4 + 1/8 + (1/12 + 1/24 )= 1/2 + 1/4 + 1/8 + 1/8= 1/2 + 1/4 + 1/4= 1/2 + 1/2= 1