1/2 +1/8+1/24+1/48+1/80怎么做

分类: 作业答案 • 2021-12-03 15:19:40

问题描述：

答

1/2+1/2*4+1/4*6+1/6*8+1/8*10
=1/2(1+1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)
=1/2(1+1/2-1/10)
=1/2*14/10
=7/10