1988/1×2+1980/2×3+1980/3×4+1988/4×5+1988/5×6简便计算

分类: 作业答案 • 2022-05-23 21:13:35

问题描述：

1988/1×2+1980/2×3+1980/3×4+1988/4×5+1988/5×6简便计算
(1-3/2×4)×(1-3/3×5)×(1-3/4×6)×.×(1-3/9×11)简便计算

答

=1988×(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=1988×(1-1/6)
=1656又2/3