1⼀2+1⼀6+1⼀12+1⼀20+1⼀30+1⼀42+1⼀56+1⼀72怎么简便计算?

2024-11-24 14:00:29
推荐回答(1个)
回答1:

1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1-1/9
=8/9
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