赞 chengwei12 幼苗
共回答了15个问题采纳率：80% 举报
二分之一加六分之一加十二分之一加二十分之一加三十分之一
=1/2+1/6+1/12+1/20+1/30
=1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)
=1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-(1/3-1/3)-(1/4-1/4)-(1/5-1/5)-1/6
=1-0-0-0-1/6
=5/6
=六分之五
=1/2+1/6+1/12+1/20+1/30
=1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)
=1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-(1/3-1/3)-(1/4-1/4)-(1/5-1/5)-1/6
=1-0-0-0-1/6
=5/6
=六分之五
1年前 追问
5
可能相似的问题
你能帮帮他们吗