1992/1993+1991/1993+1990/199+…+3/1993+2/1993+1/1993=?

分类: 作业答案 • 2021-12-03 14:44:05

问题描述：

答

1992/1993+1991/1993+1990/199+…+3/1993+2/1993+1/1993
=(1992+1991+,+2+1)/1993
=[(1992+1)×1992÷2]/1993
=1992/2
=996