1⼀3+1⼀5+1⼀7+1⼀9+1⼀11+到1⼀39简便计算怎样算

2025-03-26 02:22:12
推荐回答(1个)
回答1:

优质解答
1/3+1/5+1/7+1/9+1/11 +到1/39
=(1-1/3+1/3-1/5+.1/37-1/39)/2
=(1-1/39)/2
=76/39