1/10+1/40+1/88+1/154+1/238=

分类: 作业答案 • 2022-06-18 13:14:53

问题描述：

答

1/10+1/40+1/88+1/154+1/238
=1/3×(3/10+3/40+3/88+3/154+3/238)
=1/3×(1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17)
=1/3×(1/2-1/17)
=1/3×15/34
=5/34