6年级分数简便计算

(1/8+1/24+1/48+1/80+1/120+1/168+1/224)×64

原式=[1/2(1/2-1/4)+1/2(1/4-1/6)+1/2(1/6-1/8)+1/2(1/8-1/10)+1/2(1/10-1/12)+1/2(1/12-1/14)+1/2(1/14-1/16)]*64
=1/2*(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/14+1/14-1/16)*64
=(1/2-1/16)*32
=14
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