1-5⼀6+7⼀12-9⼀20+11⼀30-13⼀40+15⼀56-17⼀72+19⼀90-

1-5/6+7/12-9/20+11/30-13/40+15/56-17/72+19/90-后面是1/10
2025-01-31 15:42:32
推荐回答(2个)
回答1:

1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10-1/10
=1-1/2
=1/2

回答2:

1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=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)-(1/8+1/9)+(1/9+1/10)
=1-1/2+1/10
=3/5