1⼀2×1⼀3+1⼀3×1⼀4+1⼀4×1⼀5+1⼀5×1⼀6+1⼀6×1⼀7+1⼀7×1⼀8的简

2024-11-17 16:40:37
推荐回答(1个)
回答1:

1/2×1/3+1/3×1/4+1/4×1/5+1/5×1/6+1/6×1/7+1/7×1/8
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/2-1/8
=3/8