1⼀2+1⼀6+1⼀12+1⼀20+1⼀30=简便计算

2025-02-28 13:53:33
推荐回答(1个)
回答1:

1/2+1/6+1/12+1/20+1/30
=(1/2+1/6+1/12+1/20+1/30)×60÷60
=(30+10+5+3+2)÷60
=50÷60
=5/6