(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)递等式简便计算.

分类: 作业答案 • 2021-12-28 16:52:11

问题描述：

答

解
(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)
=1/2×3/2×2/3×4/3×3/4×5/4
=1/2×(3/2×2/3)×(4/3×3/4)×5/4
=1/2×1×1×5/4
=5/8