(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1)*(1/6-1)*(1/7-1)六年级数学题,简便计算!
问题描述:
(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1)*(1/6-1)*(1/7-1)六年级数学题,简便计算!
答
(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1)*(1/6-1)*(1/7-1)
=(1-1/2)×(1-1/3)×(1-1/4)×(1-1/5)×(1-1/6)×(1-1/7)
=(1/2)×(2/3)×(3/4)…×(6/7)
=1/7